60-68 Flashcards
(147 cards)
1
Q
- Which of the following has the highest energy (typical wavelength are given in parenthesis)?
A. radio waves (20 m)
B. red light (700 nm)
C. gamma rays ( 2E-12 m)
D. ultraviolet light (300 nm)
A
A. radio waves (20 m)
2
Q
- When platinum is heated in the chlorine gas the following reaction takes place
Pt(s) + Cl2(8) = PtCl2(8)
At 1000 K, ΔGo=14 kcal. If the pressure of Cl2 is 1 atm, what will be the partial pressure of PtCl2?
A. 7.5 x10-4 atm
B. 8.7 x 10-4 atm
C. 9.2 x 10-4 atm
D. 6.75 x 10-4 atm
A
B. 8.7 x 10-4 atm
3
Q
- Consider the following reaction at equilibrium: 3H2(g) + N2(g) -> 2NH3(g) +92 kJ. Which single change in conditions will cause a shift in equilibrium towards an increase in production of NH3?
A. addition of an inert gas
B. increase in temperature
C. removal of hydrogen
D. increase of pressure on the system
A
D. increase of pressure on the system
4
Q
- The gas acetylene is produced by the reaction of calcium carbide with water producing acetylene and calcium hydroxide. Calculate the number of hours of service that can be derived from 1.5 lb of calcium carbide in an acetylene lamp burning 2 cubic foot gas per hour at a temperature of 75 F and a pressure of 743 mmHg.
A. 3.11 hrs
B. 3.45 hrs
C. 4.20 hrs
D. 4.67 hrs
A
D. 4.67 hrs
5
Q
- Freezing point of heavy hydrogen is
A. 10oC
B. -3.8oC
C. 3.8oC
D. 2.6oC
A
C. 3.8 C
6
Q
- Suppose you are given a gaseous compound for which the formula is CxH2x-2 at the same temperature and pressure at which oxygen
weighs 4.8 grams per liter, the unknown gas weighs 8.10 g/L. What is the formula of the compound?
A. C2H2
B. C3H8
C. C4H6
D. C4H10
A
C. C4H6
7
Q
- The formula of blue vitriol is CuSO4*5H2O. Calculate the percentage of CuSO4 in this compound.
A. 63.9%
B. 36.1%
C. 48.2%
D. 51.8%
A
No answer
8
Q
- A quantity of gas contained in a receiver and collected over water measured 130 ml at a temperature of 22oC and a barometric pressure
of 235 mmHg. The vapor pressure of water at 22oC is 19.66 mmHg. What volume will the gas occupy at standard conditions?
A. 116 ml
B. 120 ml
C. 122 ml
D. 110 ml
A
A. 116 ml
9
Q
- When 1.53 g of glycerin is added to 500 mg of water the freezing point of the solution is -0.62oC. What is the approximate molecular
weight of glycerin?
A. 92
B. 96
C. 102
D. 85
A
A. 92
10
Q
- It was determined that 1.52 g of metal displaced 1.4L at STP of hydrogen from an acid. What is the grams-equivalent weight of the metal?
A. 8.4
B. 9.7
C. 10.8
D. 12.2
A
D. 12.2
11
Q
- A gas turbine cycle consisting of two adiabatic steps and two isobaric steps.
A. Brayton cycle
B. Sterling cycle
C. Rankine cycle
D. Otto cycle
A
A. Brayton cycle
12
Q
- For any closed system formed initially from given masses of prescribed chemical species, the equilibrium state is completely determined
by any two properties of the system, provided only that these two properties are independently variable at the equilibrium state.
A. Phase rule
B. Lewis-Randall rule
C. Duhem’s Theorem
D. Henry’s Law
A
C. Duhem’s Theorem
13
Q
- A device substantially without moving parts, in which a fuel, such as hydrogen, natural gas, methanol, propane, can be converted directly
into twice the quantity of electrical energy that would result from the usual boiler-turbine-generator combination.
A. fuel cell
B. steam power plant
C. geothermal plant
D. heat engine
A
A. fuel cell
14
Q
- The dew point of air indicates
A. the actual temperature of air
B. the temperature at which its volume per unit weight of dry air is calculate
C. the temperature at which its enthalpy is calculated
D. the temperature at which its water content will start to condense
A
D. the temperature at which its water content will start to condense
15
Q
- One ton of refrigeration capacity is equivalent to
A. 50 k cal/hr
B. 200 BTU/hr
C. 200 BTU/minute
D. 200 BTU/day
A
C. 200 BTU/minute
16
Q
- At the exit of a nozzle:
A. pressure is high and velocity is low
B. both pressure and velocity are high
C. pressure is low and velocity is high
D. both pressure and velocity are low
A
C. pressure is low and velocity is high
17
Q
- The entropy change of any system and its surroundings, considered together, resulting from any real process is positive and approaches
a limiting value ___ for any process that approaches reversibility.
A. unity
B. zero
C. infinity
D. less than 1
A
B. zero
18
Q
- The Buckingham Pi-theorem is applied to
A. pressure-velocity relationship in compressible fluid flow
B. heat transfer by natural convection
C. dimensional analysis of a physical system
D. the stability of a control system
A
C. dimensional analysis of a physical system
19
Q
- The temperature at which the moisture in humid air exerts a partial pressure equal to its vapor pressure is the
A. dry bulb temperature
B. ambient temperature
C. critical temperature
D. dew point
A
D. dew point
20
Q
- For a monoatomic ideal gas, calculate the difference in entropy change at constant pressure and constant volume suffered by 3 moles of
the gas on being heated from 300 K to 600 K.
A. 4.13 eu
B. 6.20 eu
C. 10.33 eu
D. 12.02 eu
A
B. 6.20 eu
21
Q
- Assuming CO2 to be an ideal gas, calculate the work done by 10 grams of the gas in expanding isothermally and reversibly from a volume
of 5 L to 10 L at 27oC.
A. 26.4 cal
B. 38.1 cal
C. 49.7 cal
D. 93.9 cal
A
D. 93.9 cal
22
Q
- Ten lb. of water at 14.7 psia is heated at constant pressure from 40oF to saturated vapor. Compute the entropy change.
A. 16.4 Btu/R
B. 17.4 Btu/R
C. 18.0 Btu/R
D. 18.4 Btu/R
A
B. 17.4 Btu/R
23
Q
- The temperature of a liquid-vapor system in equilibrium if the vapor phase contains 47% benzene, 7.5% aniline and 45.5% toluene exerts a total pressure of 200 mmHg is
A. 32.25 C
B. 38.28 C
C. 40.43 C
D. 21.32 C
A
No Answer
24
Q
- A turbine uses 100,000 lbm/hr of steam that enters with an enthalpy of 1400 BTU/lbm and essentially zero entrance velocity 10,000 hp
developed. The exit velocity of the steam is 500 ft/sec. expansion is adiabatic. What is the exit enthalpy?
A. 1100.2 BTU/lb
B. 1110.0 BTU/lb
C. 1140.5 BTU/lb
D. 1160.4 BTU/lb
A
C. 1140.5 BTU/lb
25
15. A 10% NaOH solution at 70oF is mixed with a 70 NaOH solution at 200oF to form a solution containing 40% NaOH. If the mixing is done
adiabatically, what will be the final temperature of the solution?
A. 180 F
B. 200 F
C. 220 F
D. 240 F
C. 220 F
26
16. A refrigerator is rated at COP of 4. The refrigerated space that it cools requires a peak cooling rate of 30,000 kJ/hr. what size electrical
motor (rated in horsepower) is required for the refrigerator.
A. 3.45 Hp
B. 1.67 Hp
C. 2.79 Hp
D. 3.90 Hp
C. 2.79 Hp
27
17. A Carnot engine operates between two temperature reservoirs maintained at 200oC and 20oC, respectively. If the desired output of the
engine is 15 Kw, determine the heat transfer from the high
A. 39.42 kW
B. 24.42 kW
C. 29.21 kW
D. 33.50 kW
A. 39.42 kW
28
18. What is the efficiency of an Otto cycle with a compression ratio 6:1. The gas used is air.
A. 0.167
B. 0.191
C. 0.488
D. 0.512
D. 0.512
29
19. Superheated steam at 200 psia and 50oF superheat expands adiabatically and reversibly to 14.7 psia. Calculate the final enthalpy.
A. 1032 Btu/lb
B. 1120 Btu/lb
C. 1250 Btu/lb
D. 1305 Btu/lb
A. 1032 Btu/lb
30
{20-23} A three-stage compressor is required to compress air from 140 kPa and 283 K to 4000 kPa. It may be assumed that the compression is adiabatic and interstage cooling is provided to cool the air to the initial temperature.
20. Calculate the ideal intermediate pressure in kPa.
A. 428 & 1308
B. 450 & 2400
C. 520 & 3100
D. 544 & 3485
21. Calculate the minimum work of compression in J/kg
A. 211800
B. 319170
C. 434988
D. 521449
22. Calculate the isothernal work of compression in J/kg.
A. 271740
B. 322800
C. 388742
D. 422890
23. Calculate the isothermal efficiency of the process.
A. 45% B. 62% C. 72% D. 85%
20. A. 428 & 1308
21. B. 450 & 2400
22. A. 271740
23. D. 85%
31
{1-4} Methane is to be compressed from atmospheric pressure to 30 MPa in four stages. Assume compression to be isentropic and the gas
behave as an ideal gas.
1. Calculate the pressure leaving the first stage in kPa
A. 240
B. 330
C. 420
D. 515
2. Calculate the pressure leaving the second stage MPa.
A. 1.74
B. 4.22
C. 7.88
D. 14.22
3. Calculate the pressure leaving the third stage in MPa
A. 7.23
B. 15.67
C. 25.87
D. 35.44
4. Calculate the work required per kilogram of gas in kJ per kg
A. 455
B. 571
C. 622
D. 711
1. C. 420
2. A. 1.74
3. A. 7.23
4. D. 711
32
5. An air-lift pump is used for raising 0.8 L/s of a liquid of density 1200 kg/m3 to a height of 20 m. air is available at 450 kPa. If the efficiency
of the pump is 30%, calculate the power requirement, assuming isentropic compression of the air.
A. 792 W
B. 1400 W
C. 2345 W
D. 3210 W
A. 792 W
33
6. Calculate the ideal available energy produced by the discharge to atmosphere through a nozzle of air stored in a cylinder of capacity 0.1
m3 at a pressure of 5 MN/m2. The initial temperature of the air is 290K and the ratio of the specific heats is 1:4.
A. 840 kJ
B. 1050 kJ
C. 1200 kJ
D. 740 kJ
A. 840 kJ
34
7. How many degree Celsius change will be a 500-watt electric heater raise the temperature of 10 liters of water in 1 hour if no heat is lost?
A. 41.0
B. 43.1
C. 44.6
D. 45.2
B. 43.1
35
8. The compression ratio of an ideal air Otto cycle is 6:1. Inlet pressure is 14.7 psia and temperature of 68oF. find the pressure and temperature at exit conditions.
A. 180.6 psig, 139 F
B. 180.6 psia, 1081R
C. 180.6 psia, 139 F
D. 180.6 psig, 1081 F
B. 180.6 psia, 1081R
36
9. Steam enters an adiabatic turbine at 10 Mpa and 500 deg Celsius at a rate of 3 kg/s and leaves at 0.1 Mpa. If the power output of the
turbine is 2 MW, determine the turbine efficiency.
A. 0.2348
B. 0.3216
C. 0.6784
D. 0.0765
C. 0.6784
37
10. Air at 1 bar and 25oC enters a compressor at low velocity discharges at 3 bar, and enters a nozzle in which it expands to a final velocity of
600 m/s at the initial conditions of pressure and temperature. if the work of compression is 240 kJ per kilogram of air, how much heat
must be removed during compression?
A. -60 kJ/kg
B. -30 kJ/kg
C. -45 kJ/kg
D. -75 kJ/kg
A. -60 kJ/kg
38
11. A stream of ethylene gas at 300oC and 45 bar is expanded adiabatically in a turbine to 2 bar. Calculate the isentropic expansion work
produced. Assume ideal gas condition.
A. -12.15 kJ/mol
B. -14.2 kJ/mol
C. -16.4 kJ/mol
D. -17.5 kJ/mol
A. -12.15 kJ/mol
39
12. Water flows from a tap at a pressure of 250 kPa above atmospheric pressure. What is the velocity of the jet if frictional effects are
neglected?
A. 12.2 m/s
B. 16.5 m/s
C. 22.4 m/s
D. 27.4 m/s
C. 22.4 m/s
40
13. A Carnot engine that absorbs heat at 300oC and exhaust heat at 100oC has an efficiency of
A. 33%
B. 65%
C. 35%
D. 67%
B. 65%
41
14. A heat engine is operated between temperature limits of 1370 C and 260 C. engine is supplied with 14,142 kJ/kwh. Find the Carnot cycle
efficiency in percent.
A. 70.10
B. 67.56
C. 65.05
D. 69.32
B. 67.56
42
15. In an experiment to determine the specific heat of cooper, a piece of copper weighing 50 g is first heated to 100 C in steam. It is then
immersed into water at 27 C. the water in the calorimeter weights 100 g and the inner aluminum cap weighs 50 g. if the final temperature is 30 C, what is the specific heat of copper, specific heat of aluminum is 0.22 cal/g-C?
A. 0.88 cal/g-C
B. 0.66 cal/g-C
C. 0.077 cal/g-C
D. 0.095 cal/g-C
D. 0.095 cal/g-C
43
16. Thirty pounds of ice at 32oF is placed in 100 lb of water at 100oF. (The latent heat of ice may be taken as 144 BTU/lb). if np heat lost or
added to the mixture, the temperature when equilibrium is reached is
A. 48 F
B. 49 F
C. 50 F
D. 51 F
D. 51 F
44
17. How much heat is required to raise the temperature to raise the temperature of 4000 g of methanol from 2 to 22oC (Cp of methanol is 0.6
cal/g-oC)
A. 48 kcal
B. 46 kcal
C. 44 kcal
D. none of these
A. 48 kcal
45
18. The specific heat of iron is 0.12 cal/g-oC. How much heat is needed to heat one pound (454 grams) of iron from 20oC to 60oC?
A. 3.27 kcal
B. 1.36 kcal
C. 2.18 kcal
D. 0.011 cal
C. 2.18 kcal
46
19. Air has a specific heat of 1kJ/kg-K. if 2 BTU of energy is added to 100 g of air, what is the change in air temperature?
A. 10 C
B. 21.1 C
C. 44.5 C
D. 88.5 C
B. 21.1 C
47
20. What horsepower is required to isothermally compress 800 cubic feet of air per minute from 14.7 psia to 120 psia?
A. 13400 hp
B. 28 hp
C. 256 hp
D. 108 hp
D. 108 hp
48
21. Ninety kilograms of ice at 0 C are completely melted. Find the entropy change, in kJ/K, if T2= 0 C.
A. 0
B. 45
C. 85
D. 105
D. 105
49
1. Which among the following has the best insulating property?
A. window glass
B. wood
C. air
D. concrete
C. air
50
A theoretical body where the absorptivity and emissivity are independent of the wavelength over the special region of the irradiation and
the surface emission is called
A. black body
B. gray body
C. opaque body
D. transparent body
B. gray body
51
The thermocouple is based on the Seeback effect which states that a/an ______ is generated when opposite junction of certain dissimilar
pairs of wires are exposed to different temperatures.
A. current
B. temperature
C. Emf
D. resistance
C. Emf
52
4. Dietus-Boelter equation for determination of heat transfer co-efficient is valid
A. for liquid metals
B. for fluids in laminar flow
C. for fluids in turbulent flow
D. polished surfaces
C. for fluids in turbulent flow
53
5. Dropwise condensation occurs on
A. clean and dirt free surfaces
B. smooth clean surfaces
C. contaminated cooling surfaces
D. polished surfaces
C. contaminated cooling surfaces
54
6. Fouling factor
A. is a dimensionless quantity
B. accounts for additional resistance to heat flow
C. does not provide a safety factor for design
D. none of these
B. accounts for additional resistance to heat flow
55
7. An insulator should have
A. low thermal conductivity
B. high thermal conductivity
C. less resistance to heat flow
D. a porous structure
A. low thermal conductivity
56
8. A popular type of heat exchanger for cooling large quantities of fluid is the
A. double-pipe
B. shell and tube
C. extended surfaces
D. plate
B. shell and tube
57
9. The rate of evaporation at a given operating temperature in an evaporator is more when
A. when operating pressure is high
B. the operating pressure is low
C. there is vacuum
D. when the liquid level is high
B. the operating pressure is low
58
10. Film and drop are terms associated with
A. boiling
B. condensation
C. evaporation
D. all of these
B. condensation
59
11. The overall conductance for a composite material in series is equal to the
A. sum of the individual conductance
B. inverse of the total resistance
C. sum of the individual conductivities
D. sum of the individual resistance
B. inverse of the total resistance
60
12. The mode of heat transfer that can take place in a vacuum is known as
A. convection
B. conduction
C. radiation
D. all of these
C. radiation
61
13. Given strength of pipe is 10000 psi and working pressure of 400 psi, find the schedule number.
A. schedule 40
B. schedule 80
C. schedule 10
D. schedule 5
A. schedule 40
62
14. The heat loss per hour through 1 ft2 furnace wall and 18 inches thick is 520 BTU/lhr. Inside temperature is 1900oF and the average k =
0.61 BTU/hr-ft-oF. What is the outside temperature?
A. 810 F
B. 520 F
C. 720 F
D. 620 F
D. 620 F
63
15. The inside and outside surface of a window glass are 20oC and -5oC, respectively. If the glass is 100 cm by 50 cm in size and 1.5 cm
thick, with thermal conductivity of 0.78 W/m-K, determine the heat loss through the glass over a period of 2 hours in units of kWH.
A. 1.10
B. 1.30
C. 1.50
D. 1.70
B. 1.30
64
16. A brick wall of thickness 25 cm and thermal conductivity 0.69 W/m-K is maintained at 20oC at one surface and 10oC at the other surface.
Determine the heat flow rate across a 5-m2 surface area of the wall.
A. 138 W
B. 142 W
C. 146 W
D. 150 W
A. 138 W
65
17. The walls of a brick-lined house consist of the following layers of materials; Brick layer 0.1 m thick, k=0.8 W/m-K; Rock-wool insulation,
0.0762 m thick, k=0.065 W/m-K, Gypsum plaster board, 0.0375 m thick, k=0.5 W/m-K. If the inside of the house is maintained at 295 K,
estimate the heat loss by conduction through the walls of area 200 m2 when the outside temperature is 265 K.
A. insufficient information
B. 4400 W
C. 2200 W
D. 8400 J/s
B. 4400 W
66
18. A steam pipe 2-in outside diameter has an inside surface temperature of 350oF. the pipe is covered with a coating material 2-in thick. The
thermal conductivity of the coating varies with temperature such that k = 0.5 + 5E-4T where T is in degrees Fahrenheit and k in Btu/hr-ft
oF. the outside surface of the coating is 100oF. Calculate the heat loss per foot of pipe length.
A. 200 Btu/hr
B. 524 Btu/hr
C. 877 Btu/hr
D. 1410 Btu/hr
C. 877 Btu/hr
67
19. A 50 mm diameter pipe of circular cross-section and with walls 3 mm thick is covered with two concentric layers of lagging, the inner layer
having a thickness of 25 mm and a thermal conductivity of 0.08 W/m-K, and the outer layer a thickness of 40 mm and a thermal
conductivity of 0.04 W/m-K. What is the rate of heat loss per meter length of pipe if the temperature inside the pipe is 550 K and the
outside surface temperature is 330 K?
A. 62.7 W/m
B. 74.7 W/m
C. 82.5 W/m
D. 98.3 W/m
A. 62.7 W/m
68
20. A liquid to liquid counterflow heat exchanger is used to heat a cold fluid from 120oF to 310oF. Assuming that the hot fluid enters at 500oF
and leaves at 400oF, calculate the log mean temperature difference for the heat exchanger.
A. 132 F
B. 332 F
C. 232 F
D. 432 oF
C. 232 F
69
21. In an oil cooler, 216 kg/h of hot oil enters a thin metal pipe of diameter 25 mm. An equal mass of cooling water flows through the anniular
space between the pipe and the larger concentric pipe; the oil and water moving in opposite directions. The oil enters at 420 K and is to
be cooled 320 K. if the water enters at 290 K, what length of pipe will be required? Take coefficient of 1.6 kW/m2-K on the oil side and 3.6
kW/m2-K on the water side and 2.0 kJ/kg-K for the specific heat of the oil.
A. 1.45 m
B. 8.75 m
C. 2.67 m
D. 7.42 m
C. 2.67 m
70
22. In an oil cooler, water flows at the rate of 360 kg/h per tube through metal tubes of outer diameter 19 mm and thickness 1.3 mm, along
the outside of which oil flows in the opposite direction at the rate of 6.675 kg/s per tube. If the tubes are 2 m long and the inlet
temperatures of the oil and water are 370 K and 280 K respectively, what will be the outlet oil temperature? the coefficient of heat transfer
on the oil side is 1.7 kW/m2-K and on the water side 2.5 kW/m2-K and the specific heat of oil is 1.9 kJ/kg-K.
A. 240 K
B. 155 K
C. 188 K
D. 324 K
No Answer
71
23. Calculate the total heat loss by radiation and convection from an unlagged horizontal steam pipe of 50 mm outside diameter at 415 K to air at 290 K.
A. 110 W/m
B. 345 W/m
C. 175 W/m
D. 210 W/m
72
24. A single-effect evaporator is used to concentrate 7 kg/s of a solution from 10 to 50 per cent of solids, sgteam is available at 250 kN/m2 and evaporating takes place at 13.5 kN/m2. If the overall heat transfer coefficient is 3 kW/m2-K, calculate the heating surface required and the amount of steam used if the feed to the evaporator is at 294 K and condensate leaves the heating space at 352.7 K. The specific heat capacity of a 10 per cent solution is 3.76 kJ/kg-K, the specific heat capacity of a 50 per cent solution is 3.14 kJ/kg-K.
A. 6.5 kg/s, 69 m2 B. 6.5 kg/s, 45 m2 C. 3.2 kg/s, 69 m2 D. 4.1 kg/s, 45 m2
{25-27} A single-effet evaporator with heating surface area 10 m2 is used to concentrate NaOH solution flowing at 0.38 kg/s from 10 per cent
to 33.3 per cent. The feed enters at 338 K and its specific heat capacity is 3.2 kJ/kg-K. The pressure in the vapor space is 13.5 kN/m2 and
0.3 kg/s of steam is used from a supply at 375 K. Calculate:
25. The apparent overall heat transfer coefficient in kW/m2-C
A. 1.248 B. 1.424 C. 1.482 D. 1.289
73
{25-27} A single-effect evaporator with heating surface area 10 m2 is used to concentrate NaOH solution flowing at 0.38 kg/s from 10 percent to 33.3 percent. The feed enters at 338 K and its specific heat capacity is 3.2 kJ/kg-K. The pressure in the vapor space is 13.5 kN/m2 and
0.3 kg/s of steam is used from a supply at 375 K. Calculate:
25. The apparent overall heat transfer coefficient in kW/m2-C
A. 1.248
B. 1.424
C. 1.482
D. 1.289
26. The coefficient corrected for boiling point rise of dissolved solids in kW/m2-C.
A. 2.122
B. 1.224
C. 2.214
D. 2.412
27. The corrected coefficient in the depth of the, liquid is 1.5 m.
A. 1.247
B. 1.275
C. 1.427
D. 1.472
No Answer
74
{28-30} A liquid with no appreciable elevation of boiling-point is concentrated in a triple-effect evaporator. If the temperature of the steam to the first effect is 395 K and vacuum is applied to the third effect so that the boiling-point is 325 K? the overall transfer coefficient may be taken
as 3.1, 2.3, and 1.1 kW/m2-K in the three effects respectively.
28. What is the approximate boiling-point in the first effect
A. 381.5 K
B. 70 K
C. 363.2 K
D. 325 K
29. What is the approximate boiling-point in the second effect?
A. 381.5 K
B. 70 K
C. 363.2 K
D. 325 K
30. What is the approximate boiling-point in the third effect?
A. 381.5 K
B. 70 K
C. 363.2 K
D. 325 K
28. A. 381.5 K
29. C. 363.2 K
30. D. 325 K
75
{1-4} A solution is to be concentrated from 10 to 65 % solids in a vertical long-tube evaporator. The solution has a negligible elevation of boiling
point and its specific heat can be taken to be the same as that of water. Steam is available at 203.6 kPa, and the condenser operates at 13.33 kPa. The feed enters the evaporator at 295 K. the total evaporation is to be 25000 kg/hr of water. Overall heat transfer coefficient is 2800 W/m2-K.
1. Calculate the heat transfer required in kW.
A. 19800
B. 17523
C. 24532
D. 30900
2. Calculate the steam consumption in kilograms per hour.
A. 28700
B. 35400
C. 40100
D. 43600
3. Calculate the heating transfer area required in square meters.
A. 24.2
B. 34.8
C. 70.8
D. 90.7
4. Calculate the steam economy.
A. 0.45
B. 0.67
C. 0.87
D. 0.98
1. B. 17523
2. A. 28700
3. D. 90.7
4. C. 0.87
76
5. Emissivity of sandstone is
A. 0.23
B. 0.59
C. 0.78
D. 0.90
B. 0.59
77
6. Emissivity of chronnickel is
A. 0.35
B. 0.46
C. 0.64
D. 0.82
C. 0.64
78
7. A furnace is constructed with 0.20 m of firebrick (1.4 W/mK), 0.10 m of insulating brick (k=0.21 W/mK), and 0.20 m of building brick (k=0.7
W/mK). The inside temperature is 1200 K and the outside temperature 330 K. Calculate the temperature at the junction of the firebrick
and the insulating brick.
A. 800 K
B. 1080 K
C. 1063 K
D. 985 K
C. 1063 K
79
8. A furnace wall consists of an inner layer of refractory brick 30 cm thick and an outer layer of insulating brick 20 cm thick. The fire side of the refractory brick is at 1000oC while the outside wall of the insulating brick is at 80oC. Calculate the temperature at the junction of the firebrick and the insulating brick.
A. 342 C
B. 948 C
C. 888 C
D. 550 C
C. 888 C
80
9. A continuous single effect evaporation concentrates 9072 kg/hr of a 1 wt% salt solution entering as 311.0 K (37.8oC) to a final concentration of 15 wt%. The vapor space of the evaporator is at 101.325 kPa (1 atm abs) and the steam is saturated at 143.3 kPa. The overall coefficient U=1704 W/m2-K. Calculate the heat transfer area required. Assume that it is dilute, the solution has the same boiling
points as water.
A. 120.1 m2
B. 132.9 m2
C. 149.3 m2
D. 170.5 m2
C. 149.3 m2
81
10. Heat is transferred from one fluid stream to a second fluid stream across a heat transfer surface. If the film coefficients for the two fluid
are, respectively, 1.0 and 1.5 kW/m2-K, the meatl is 6 mm thick (thermal conductivity 20 W/m-K) and the scale coefficient is equivalent to
850 W/m2-K, what is the overall heat transfer coefficient?
A. 110 W/m2-K
B. 318 W/m2-K
C. 220 W/m2-K
D. 450 W/m2-K
B. 318 W/m2-K
82
11. A furnace is constructed with 255 mm of firebrick, 120 mm of insulating brick, and 225 mm of building brick. The inside temperature is
1200 K and the outside temperature 330 K. if the thermal conductivities are 1.4, 0.2, and 0.7 W/m-K, find the heat loss per unit area and
the temperature at the junction of the firebrick and the insulating brick.
A. 803 W/m2, 500K, 1150 K
B. 720 W/m2, 770K, 1020 K
C. 803 W/m2, 589K, 1071 K
D. 720 W/m2, 589K, 1005 K
C. 803 W/m2, 589K, 1071 K
83
12. Seawater is being desalinated by evaporation. From seawater with a salt content of 600 ppm, it is desire to have process water at 20
ppm. The specific heat of pipe material is 0.6 kJ/kg-K and the specific weight is 28 kg/m.
A. 0.083
B. 0.151
C. 0.033
D. 0.113
D. 0.113
84
13. Compute the amount of condensate formed during 10 minutes warm-up of 150 m pipe which conveys saturated steam with enthalpy of vaporization of 1947.8 kJ/kg. the minimum external temperature of pipe is 2oC and the final temperature is 195oC. The specific heat of pipe material is 0.6 kJ/kg-K and the specific weight is 28 kg/m.
A. 249.69 kg
B. 124.85 kg
C. 499.38 kg
D. 62.42 kg
A. 249.69 kg
85
14. A 6-in Sch 80 steel pipe is carrying glycerin at an average temperature of 100 deg F. The pipe is uninsulated, and the outside temperature is 30 deg F. the inside film conductance is 1000 Btu/h-ft-degF while the outside film conductance is 3.0 Btu/h-sq.ft-degF. Determine the heat lost [Btu] per minute from 75-ft length of the pipe. glycerine is flowing at 800 gpm.
A. 99.95
B. 415.7
C. 451.7
D. 475.1
C. 451.7
86
15. A pipe with an outside diameter of 2.5 inch is insulated with a 2 inch layer of asbestos (k=0.396 Btu-in/hr-ft2-oF), followed by a layer of cork 1.5 inch thick (k=0.30 Btu-in/hr-ft2-oF). if the temperature of the outer surface of the pipe is 290oF and the outer surface of the cork is 90oF, calculate the heat lost per 100 ft of insulated pipe.
A. 846.74 Btu/hr
B. 2847.4 Btu/hr
C. 3845.7 Btu/hr
D. 1844.7 Btu/hr
B. 2847.4 Btu/hr
87
16. A standard 1-in schedule 40 iron pipe carries saturated steam. The pipe is lagged (insulated) with a 2-in layer of 85% magnesia (k=0.034
Btu/hr-ft-oF) pipe covering, and the outside this magnesia there is a 3-in layer cork (k=0.03 Btu/hr-ft-oF). The outside temperature of the
pipe wall is 249o+F, and the outside temperature of 90oF. Calculate the heat loss in Btu per foot length of pipe per hour.
A. 2736
B. 3028
C. 3420
D. 3560
A. 2736
88
17. A 6-inch steel pipe (O.D.=6.63 inches) insulated with magnesia is tested with thermocouples touching the pipe itself and in the insulation at a distance of 3 inches out from the first. If the first thermocouple registers 350oF and the second 150oF, what is the heat loss from 100 ft of pipe in Btu per hr.
A. 65
B. 72
C. 78
D. 87
C. 78
89
18. A copper tube of length 3 m, inner diameter of 1.2 cm and outer diameter of 1.7 cm passes through a container of rapidly circulating water maintained at 20oC. If the steam passes through the tube at 100oC, compute the amount of heat flow rate from the steam ti the container? The thermal conductivity of the copper is 1 cal/c-cm-oC.
A. 1.4E6 cal/s
B. 1.2E6 cal/s
C. 2.3E6 cal/s
D. 3.2E6 cal/s
B. 1.2E6 cal/s
90
19. Compute the amount of heat transferred in one hour through a solid brick wall 6 m x 2.9 m x 225 mm, when the outer surface is at 5oC and the inner surface 17oC. The coefficient of thermal conductivity of the brick is approximately 0.6 W/m-K.
A. 2004.5 kJ
B. 2740.5 kJ
C. 1674.5 kJ
D. 3767.5 kJ
A. 2004.5 kJ
91
20. Compute the amount of heat flow per second through an iron plate 2 cm thick and area of 5000 cm2 if one face has a temperature of 150oC and the other face is 140oC? The thermal conductivity for iron is 80 W/m-K.
A. 30 kJ/s
B. 40 kJ/s
C. 10 kJ/s
D. 20 kJ/s
D. 20 kJ/s
92
21. Calculate the quantity of heat conducted per minute through a duralumin circular disk 127 mm diameter and 19 mm thick when the temperature drop across the thickness of the plate is 5oC. take the coefficient of thermal conductivity of duralumin as 150W/m-K.
A. 30 kJ
B. 35 kJ
C. 40 kJ
D. 45 kJ
A. 30 kJ
93
22. A wall is made of firebricks 6 inches thick and has a 50oC difference in temperature both sides. Calculate the heat transferred through the wall if the thermal conductivity of the bricks is 0.65 BTU/hr-ft-oF.
A. 185 W/m2
B. 245 W/m2
C. 369 W/m2
D. 467 W/m2
C. 369 W/m2
94
23. Cold air at 10oC is forced to flow over a flat plate maintained at 40oC. the meat heat transfer coefficient is 30 W/m2-K. Find the hear flow rate from the plate to the air through a plate area of 2 m2. Assume radiation negligible.
A. 1.8 kW
B. 2.0 kW
C. 2.2 kW
D. 2.4 kW
A. 1.8 kW
95
24. The inside and outside surface of a window glass at 20oC and -5oC, respectively. If the glass is 100 cm by 50 cm in size and 1.5 cm thick, with thermal conductivity of 0.78 W/m-oC, determine the heat loss through the glass over a period of 2 hours.
A. 1.3 kW-h
B. 2.7 kW-h
C. 3.1 kW-h
D. 3.9 kW-h
A. 1.3 kW-h
96
25. Find the heat loss per unit area of surface through a brick wall when the inner surface is at 400 K and the outside at 310 K. The thermal conductivity of 0.78 W/m-oC.
A. 126 W/m2
B. 142 W/m2
C. 166 W/m2
D. 178 W/m2
A. 126 W/m2
97
26. What thickness of the wood has the same insulating ability as 10 cm brick of thermal conductivity equal to 0.8 W/m-K and 0.1 W/m-K for the wood?
A. 1.25 cm
B. 1.00 cm
C. 2.10 cm
D. 2.54 cm
A. 1.25 cm
98
1. The equivalent diameter of a concentric annular space where 1-in OD pipe is located inside a 2-in ID pipe is
A. 1 in
B. 1.5 in
C. π/4 in
D. 2 in
A. 1 in
99
2. A heavy hydrogen oil (Cp=2.30 kJ/kg-K) is being cooled in a countercurrent double pipe heat exchanger from 371oK to 349oK and flows inside the inner pipe’1ft 3630 kg/hr. Water is used for cooling at a rate of 1450 kg/hr and enters the annulus at 288.6K. The outlet temperature of water should be
A. 319.1 F
B. 319.1 K
C. 280 F
D. 280 K
3. From the data in problem #2, the logarithmic mean temperature difference is
A. 60 K
B. 50 K
C. 57 K
D. 69 K
2. B. 319.1 K
3. C. 57 K
100
4. Methyl alcohol flowing in the inner pipe of a double pipe exchanger is cooled with water flowing in the jacket. The inner pipe is made from 1-inch schedule 40 steel pipe, k of steel is 26 Btu/hr-ft-oF. The individual coefficients and fouling factor are ho=300 Btu/hr-ft2-oF, hi=180, hdo=500 and hdi=1000. What is the overall heat transfer coefficient, based on the outside area of the inner in Btu/hr-ft2-oF?
A. 89
B. 71
C. 26
D. 98
B. 71
101
5. Two liquids of different densities (1500 kg/m3 and 500 kg/m3) are poured together into a 100-liter tank, filling it. if the resulting density of the mixture is 800 kg/m3, find the respective mass of the liquids used.
A. 45kg & 35kg
B. 40kg & 40kg
C. 50kg & 30kg
D. 55kg & 25kg
A. 45kg & 35kg
102
6. A fluid moves in a steady flow manner between two sections in a flow line. At section 1: A1=1 ft2, V1=1000 fpm and v1 = 4 ft3/lb. At section 2: A2=2ft2, p2=0.20 lb/ft3. Calculate the velocity at section 2.
A. 3.2 m/s
B. 2.8 m/s
C. 2.4 m/s
D. 2.0 m/s
A. 3.2 m/s
103
7. Two gases stream enter a combining tube and leave as single mixture. These data apply at the entrance sections: For one gas, A1=75in2, V1=500fps, v1=10ft3/lb; for the other gas, A2=50 in2, m2=60,000 lb/hr, p2=0.12 lb/ft3. At exit, V3=350 fps, v3=7ft3/lb. find the velocity V2 at section 2.
A. 250 ft/s
B. 300 ft/s
C. 350 ft/s
D. 400ft/s
8. From the data problem #7, find the mass flow rate at the exit section.
A. 144,400 lb/hr
B. 148,200 lb/hr
C. 153,750 lb/hr
D. 154,800 lb/hr
9. From the data from problem #7, find the cross sectional area ta the exit.
A. 115 in2
B. 123 in2
C. 128 in2
D. 133 in2
7. D. 400ft/s
8. C. 153,750 lb/hr
9. B. 123 in2
104
10. If 6L of a gas at a pressure of 100 kPa abs are compressed reversibly according to pv2=C until the volume becomes 2 L, find the final
pressure.
A. 800 kPa abs
B. 850 kPa abs
C. 900 kPa abs
D. 950 kPa abs
11. From the data in problem #10, find the work.
A. 1.2 kJ
B. 2.7 kJ
C. 3.2 kJ
D. 3.8 kJ
10. C. 900 kPa abs
11. A. 1.2 kJ
105
12. Work is done by a substance in a reversible non-flow manner according to v=100/p-ft3, where p is in psia. Evaluate the work done on or by the substance as the pressure increases from 10 psia to 100 psai.
A. 28987 ft-lb
B. 33157 ft-lb
C. 34550 ft-lb
D. 35675 ft-lb
B. 33157 ft-lb C.
106
13. If 6 lb argon undergo a constant pressure heating process from 80oF to 230oF, determine the heat needed.
A. 112 Btu
B. 242 Btu
C. 312 Btu
D. 455 Btu
14. From the data in problem #13, calculate the change in internal energy.
A. 412 Btu
B. 345 Btu
C. 210 Btu
D. 67 Btu
13. A. 112 Btu
14. D. 67 Btu
107
15. A closed gaseous system undergoes a reversible process during which 25 Btu are rejected, the volume changing from 5 ft3 to 2 ft3, and the pressure remains constant at 50 psia. Find the change iof internal energy.
A. 2.76 Btu
B. 12.4 Btu
C. 18.9 Btu
D. 24.5 Btu
A. 2.76 Btu
108
16. A 10 ft3 drum contains saturated vapor at 100oF. What are the pressure and mass of vapor in the drum if the substance is water?
A. 10.5 psia, 0.3 lb
B. 0.95 psia, 0.03 lb
C. 21.0 psia, 2.4 lb
D. 32 psia, 10.5 lb
B. 0.95 psia, 0.03 lb
109
17. A 10 ft3 drum contains saturated vapor at 100oF. What are the pressure and mass of vapor in the drum if the substance is ammonia?
A. 20.5 psia,1.25 lb
B. 75.2 psia, 23.4 lb
C. 212psia, 7.14 lb
D. 11 psia, 0.56 lb
C. 212psia, 7.14 lb
110
18. A 10 ft3 drum contains saturated vapor at 100oF. What are the pressure and mass of vapor in the drum if the substance is Freon 12r?
A. 130 psia, 32.3 lb
B. 98 psia, 24.5 lb
C. 65.4 psia, 18.9 lb
D. 34.2 psia, 8.9 lb
No Answer
111
19. A liquid with specific gravity of 4.7 and a viscosity of 1.3 cp flows through a smooth pipe of unknown diameter, resulting in a pressure drop of 0.183 lbf/in2 for 1.73 mi. What is the pipe diameter in inches if the mass flow rate is 5900 lb/hr?
A. 3.64 in
B. 0.44 in
C. 5.74 in
D. 0.005 in
A. 3.64 in
112
20. The equivalent of 45oTw in the Baume scale is
A. 28.32
B. 32.48
C. 26.63
D. 42.56
C. 26.63
113
21. One drier will dry a material from 45% moisture (wet basis) to 20% moisture (dry basis) from here the material enters another drier where the H2O content is further reduced to a give a final product weighing 1000 kg. If the total evaporation form both driers is 800 kg, the moisture is
A. 5%
B. 2%
C. 3%
D. 1%
D. 1%
114
22. A mill produces wet paper containing 15% water by weight (wet basis). This water paper is fed in a continuous steady-state operation through a drier where the water content is reduced to 6% by weight. If the heating cost is 5 centavos for every pound of water removed from the paper in the drying operation, what is the heating cost per 100 lb of wet paper fed into the dryer?
A. P1.50
B. P0.36
C. P0.48
D. P2.00
C. P0.48
115
23. Battery acid has a density of 1286 g/ml and contains 38.0% by weight H2SO4. How many grams of pure H2SO4 ore contained in a liter battery acid?
A. 430
B. 442
C. 475
D. 488
C. 475
116
24. A dehumidifier sprays 50 lb of cool water per minute into a stream of air. One hundred pounds of wet air per minute enters the dehumidifying chamber. The absolute humidity of the entering air is 0.05 water/lb dry air and that of the leaving air is 0.01 lb water/lb dry air. What is the weight of wet air leaving per minute?
A. 3.81
B. 50
C. 53.81
D. 96.2
D. 96.2
117
25. What volume of 0.125 M H2SO4 is required to completely precipitate all of the barium in 10.00 mL of a 0.150 M Barium nitrate solution?
A. 12.0 mL
B. 24.0 mL
C. 6.00 mL
D. 0.206 mL
A. 12.0 mL
118
26. The fermentation of glucose, C6H12O6, produces ethyl alcohol, C2H5OH, and carbon dioxide, C6H12O6(aq) 2 C2H5OH(aq) +2CO2(g). How many grams of ethanol can be produced from 10 grams of glucose?
A. 10.0 g
B. 2.56 g
C. 5.11 g
D. 4.89 g
No Answer
119
27. If the reaction of 3.82 g magnesium nitride with 7.73 g of water produced 3.6 g of magnesium oxide, what is the percent yield of this reaction?
A. 94.5 %
B. 78.8 %
C. 46.6 %
D. 49.4 %
B. 78.8 %
120
29. A certain stoichiometric problem was solved on the basis of 100 mole dry flue gas (DFG). The given conditions at the stack outlet are as follows: 780 mmHg, 970 K and the partial pressure of H2O is 24 mmHg. The partial pressure of H2O is equal to _____in Hg
A. 0.88
B. 0.80
C. 0.85
D. 0.94
D. 0.94
121
30. A certain stoichiometric problem was solved on the basis of 100 mole dry flue gas (DFG). The given conditions at the stack outlet are as follows: 780 mmHg, 970 K and the partial pressure of H2O is 24 mmHg. The volume of the wet gas is
A. 6.098 m3
B. 8.001 m3
C. 8719 L
D. 592 L
B. 8.001 m3
122
31. A certain stoichiometric problem was solved on the basis of 100 mole dry flue gas (DFG). The given condition at the stack outlet is as follows: 780 mmHg, 970 K and the partial pressure of H2O is 24 mmHg. Pressure of the gas stream in psia is:
A. 15.09
B. 14.7
C. 22.34
D. 21.71
A. 15.09
123
32. A certain stoichiometric problem was solved on the basis of 100 mole dry flue gas (DFG). The given condition at the stack outlet is as follows: 780 mmHg, 970 K and the partial pressure of H2O is 24 mmHg. Actual volume occupied by the computed moles of H2O is
A. 246.22 L
B. 256.33 L
C. 24.9 L
D. 25.6 L
A. 246.22 L
124
33. A certain stoichiometric problem was solved on the basis of 100 mole dry flue gas (DFG). The given condition at the stack outlet is as
follows: 780 mmHg, 970 K and the partial pressure of H2O is 24 mmHg. Flue gas temperature in oF is
A. 613
B. 1472
C. 323
D. 1287
D. 1287
125
34. A furnace completely burns coal containing 80% C. Analysis of the fuel gas shows 14.5% CO2, 3.76% O2 and no CO. What is the percentage of the net hydrogen in the coal?
A. 6.37%
B. 8.90%
C. 10.12%
D. 14.25%
A. 6.37%
126
35. One kilogram of water (c=4.2 kJ/kg-K) is heated by 300 Btu enrgy. What is the change in temperature in K?
A. 73.8
B. 17.9
C. 74.4
D. 75.4
D. 75.4
127
36. What is the needed to raise 1 molecule of water by 10oC in ergs?
A. 1.3E-14
B. 2.6E-12
C. 2.6E-14
D. 1.2E-12
A. 1.3E-14
128
37. What is the resulting pressure when one pound of air at 50 psia and 200 F is heated at constant volume to 800 F?
A. 52.1 psia
B. 36.4 psia
C. 75.3 psia
D. 95.5 psia
D. 95.5 psia
129
38. What is the change in entropy of 1 lbmol of an ideal gas which is initially at 120oF and 10 atm pressure is expanded irreversibly to 1 atm
and 70oF? The molar heat capacity at constant pressure is 7 Btu/lbmol-oF.
A. 4.58
B. 3.95
C. 0.63
D. 0
B. 3.95
130
39. A Carnot engine rejects 80 MJ of energy every hour by transferring heat to a reservoir at 10oC. Determine the high-temperature reservoir in oC if the rate of energy addition is 40 kW.
A. 120 C
B. 230
C. 239
D. 275
C. 239
131
40. A heat engine (Carnot Cycle) has its intake and exhaust temperature of 157 C and 100 C respectively. What is the efficiency?
A. 12.65%
B. 14.75%
C. 15.35%
D. 13.25%
D. 13.25%
132
41. A heat engine absorbd heat from the combustion of gasoline at 2200oC. The gasoline has a specific gravity of 0.8 and a heat of combustion of 11,200 cal/gram. The engine rejects heat at 1200oC. The maximum work in calories that can be obtained from the combustion of 1 liter gasoline is
A. 3.62E6 cal
B. 4.53E4 cal
C. 3.78E5 cal
D. 4.22E6 cal
A. 3.62E6 cal
133
42. A Carnot engine requires 35 kJ/s from the hot source. The engine produce 15 kW of power and the temperature of the sinks is 26 C. What is the temperature of the hot source in oC?
A. 245.7
B. 210.10
C. 250.18
D. 260.68
C. 250.18
134
43. A heat engine operates on a Carnot cycle with an efficiency of 75%. What CCP would a refrigerator operations on the same cycle have? The low temperature is 0 C.
A. 0.45
B. 0.57
C. 0.67
D. 0.33
D. 0.33
135
44. The density of ice is 917 kg/m3, and the approximate density of sea water in which an iceberg floats is 1025 kg/m3. What fraction of iceberg is beneath the water surface?
A. 0.45
B. 0.71 C. 0.89
D. 0.29
136
45. An iceberg has a specific weight of 9000 N/m2 in ocean water, with a specific weight of 10000 N/m2. Above the water surface, it was observed that a volume of 2800 m3 of the iceberg protruded. Determine the volume of the iceberg below the free surface of the ocean.
A. 23000 m3
B. 25000 m3
C. 35000 m3
D. 38000 m3
B. 25000 m3
137
46. An ice berg has a density of 57.1 lb/ft3. If it floats in fresh water, what percent of the iceberg’s volume will be visible?
A. 1.25 m/s
B. 1.50 m/s
C. 1.75 m/s
D. 2.00 m/s
A. 1.25 m/s
138
50. Water is flowing in a 5 centimeter diameter pipe at a velocity of 5 m/s. the pipe expands to 10-centimeter diameter pipe. Find the volumetric flow rate in the 10-centimeter diameter pipe.
A. 589 L/min
B. 610 L/min
C. 615 L/min
D. 621 L/min
A. 589 L/min
139
51. Water is flowing in a pipe of varying cross-sectional area, and at all points the water completely fills the pipe. The cross-sectional area at point 1 is 0.80 m2, and the velocity of is 3.5 m/s. compute the fluid’s velocity at point 2 where the cross sectional area is 0.60 m2
A. 5.22 m/s
B. 2.57 m/s
C. 4.67 m/s
D. 3.25 m/s
C. 4.67 m/s
140
52. At which critical speed which the flow of water in a long cylindrical pipe of diameter 2 cm becomes turbulent considering that the temperature is 20oC, viscosity is 1E-3 Pa-s, and the critical Reynold’s number is 3000.
A. 0.350 m/s
B. 0.250 m/s
C. 0.234 m/s
D. 0.150 m/s
D. 0.150 m/s
141
53. Oil at 1190oF (SG=0.826) is flowing at a rate of 105 lb/min through a 0.75-in diameter galvanized pipe that is 12 feet long; the kinematic
viscosity of the oil 0.000862 ft2/sec. The loss due to friction is 112 lbf/ft2 per ft of pipe. Determine the Reynold’s number.
A. 400
B. 800
C. 1200
D. 1600
B. 800
142
54. At 68F water has a dynamic viscosity of about 2.11E-5 lb-s/ft2. Which of the following is the kinematic viscosity in ft2/s of water whose specific gravity is 0.998 at this temperature?
A. 1.09E-5
B. 3.12E-5
C. 2.10E-7
D. 4.25E-5
A. 1.09E-5
143
55. SAE 10 oil at 20C with absolute (dynamic) viscosity of 0.0017 lb-s/ft2 is sheared between two parallel plates 0.02 in apart with lower fixed and the upper plate moving at 15 ft/s. Compute the shear stress in the oil.
A. 15.3 lb/ft2
B. 24.7 lb/ft2
C. 16.3 lb/ft2
D. 12.3 lb/ft2
A. 15.3 lb/ft2
144
56. Oil with viscosity 30cp and a density of 600 lb/ft3 flows through a ½ inch ID tube. Determine the velocity in ft/s below which the flow is laminar.
A. 13.1
B. 169
C. 87.9
D. 0.63
B. 169
145
57. Water is flowing in a 5 centimeter diameter pipe at a velocity of 5 m/s. the pipe expands 10-centimeter diameter pipe. Calculate the Reynold’s number in the 5-centimeter fiameter section of pipe. The kinematic viscosity of water is 1.12E-6 m2/s.
A. 1.2 E 4
B. 1.2 E 5
C. 2.2 E 4
D. 2.2 E 5
D. 2.2 E 5
146
58. 98% sulfuric acid of viscosity 0.025 N-s/m2 and a density 1840 kg/m3 is pumped at 685 cm3/s through a 25 mm line. Calculate the value of the Reynold’s number.
A. 1200
B. 1745
C. 2100
D. 2572
D. 2572
147
59. An astronaut weighs 730 N in Houston, Texas, where the local acceleration of gravity is g=9.792 m/s2 what is the astronauts weight on
the moon, where g=1.67 m/s2?
A. 210 N
B. 175 N
C. 143 N
D. 125 N
D. 125 N
