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ED & PD > S4 > Flashcards

S4 Flashcards

1
Q

In common bubble cap distillation column design practice, riser area is approximately equal to (where, Aa = Annular passage area, and Sa = Slot area)

A

Aa = Sa

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2
Q

Heat transfer co-efficient, hG(Kcal/hr.m^2 .°C) and mass velocity of air, G (kg/hr.m^2 ) for air flow parallel to the surface in case of constant drying rate in batch drying is related as hG = 0.0176G^0.8. But when the flow of air perpendicular to the surface is encountered, this equation changes to

A

hG = 1.004G^0.37

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3
Q

In the agitators, the power required will be changed with the increase of diameter of agitator (D) as

A

D^5

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4
Q

Apex angle of conical heads used in the bottom heads of chemical process equipments is usually

A

60°

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5
Q

Pressure drop due to pipe fittings can be estimated by the equation , where, ∆P/ ρ = 4f . Le/D . v^2 / 2gc, where,
Le = equivalent of straight pipeline which will incur the same frictional loss as the fitting and D = diamter of the fitting. The value of Le/D (dimensionless for 45° and below 180° close return bends would be respectively around

A

45 and 75

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6
Q

A pressure vessel is said to be made of ‘thick’ shell, if the ratio of its diameter to wall thickness is

A

10

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7
Q

Tube side heat transfer co-efficient for turbulent flow of liquid through tubes is proportional to

A

G^0.8

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8
Q

Circumferential (hoop) stress in a thin cylindrical vessel under internal pressure is _ the longitudinal stress.

A

twice

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9
Q

The dust collection efficiency of electrostatic precipitator increases with increase in the

A

electrode area.

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10
Q

For storing hazardous chemicals in large storage tanks, the minimum safe distance between the two tanks should range between __________ times the tank diameter

A

1 to 1.5

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11
Q

Which of the following factors determine the amount of entertainment in a distillation column?

A

All (a), (b) and (c)

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12
Q

The absorption factor is defined as (where, S1 = slope of the equilibrium curve, S2 = slope of the operating line)

A

S1/S2

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13
Q

In shell and tube heat exchangers, straight tie rods are used to

A

hold baffle in space.

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14
Q

In a rotary drier, the average retention time of solid is (where Z = length of the drier, metres ρ = apparent solid density, kg/m3 L = flow rate of dry solids, kg/see*m^2 drier cross-section H = hold up of solid.)

A

Z.H.ρ / L

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15
Q

In case of design of a shell and tube heat exchanger,

A

all (a), (b) & (c).

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16
Q

In a cylinderical vessel subjected to internal pressure, the longitudinal stress σL and the circumferential stress, σn are related by

A

σh = 2 σL

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17
Q

Nominal size of a pipe is an indication of its __________ diameter.

A

approximate

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18
Q

Excessive liquid gradient on a tray may result in the

A

all (a), (b) and (c).

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19
Q

The ratio of tube length to shell diameter in case of liquid shell and tube heat exchanger ranges from

A

4 to 8

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20
Q

In a double pipe concentric heat exchanger, the equivalent diameter of annulus for heat transfer would be (where, D1 and D2 are I.D. of inner and outer pipes)

A

D2^2 - D1^2 / D1^2

21
Q

What is the slope of the operating line in the stripping section of a distillation column?

A

> 1

22
Q

__________ shaped roof is most commonly used for cylindrical tanks.

A

Cone

23
Q

In a thin cylindrical shell, the hoop stress is __________ stress.

A

circumferential tensile

24
Q

Commercial packed scrubbers are normally designed for a pressure drop range of __________ mm water coloumn per metre of packed height.

A

17-34

25
Q

The retention time of material in a rotary dryer depends upon its

A

all (a), (b) and (c)

26
Q

In actual operation of a bubble cap distillation tower, the __________ at the bottom of the tower is more than that at the top of the tower.

A

all (a), (b) and (c)

27
Q

Rotary driers are most economically designed for the number of heat transfer units (HTU) from

A

1.5 to 2.5

28
Q

The difficulty of liquid distribution in packed towers is accentuated, when the ratio of tower diameter to packing diameter is

A

< 7

29
Q

An increase in the liquid resistance to interphase mass transfer and a resultant reduction in plate efficiency is caused by

A

all (a), (b) and (c).

30
Q

In the design of a bag filter, the gas temperature is an important consideration, as it affects the

A

all (a), (b) & (c)

31
Q

With increase in temperature drop (in a shell and tube heat exchanger), the LMTD correction factor, FT

A

decreases very rapidly

32
Q

The normal range of velocity of steam in pipes is __________ m/sec.

A

80-100

33
Q

__________ dished head is the strongest of all.

A

Hemispherical

34
Q

Pick out the correct statement.

A

Risers are generally not connected to the plate in a distillation coloumn by bolts, rivets or welding.

35
Q

“A claming section” before the liquid flows into the downcomer is provided to

A

permit release of entrained vapour in the liquid.

36
Q

The units of Young’s modulus of elasticity and __________ are the same.

A

stress

37
Q

In the design of a shell and tube heat exchanger, the corrosion allowance

A

all (a), (b) & (c).

38
Q

Vertical condenser is advantageous to the horizontal condenser from operation point of view, when

A

both the functions of condensation & sub cooling are carried out in a single unit.

39
Q

Hazards associated with the relief valve leakage for extremely hazardous material storage can be taken care of by providing

A

rupture diaphragm

40
Q

Minimum baffle spacing recommended in a shell and tube heat exchanger is equal to

A

5 cms

41
Q

__________ liquor is best handled in a long tube vertical evaporator.

A

Foamy

42
Q

Theoretically calculated diameter of the stripping section of the continuous rectification column is __________ that of the enriching section.

A

more than

43
Q

Hold up of material in a operating rotary drier is in the range of

A

0.05 to 0.15

44
Q

A binary liquid azeotropic mixture has boiling point higher than either of the components, when it shows __________ deviation from Raoult’s Law.

A

negative

45
Q

The testing pressure of storage tanks and pressure vessels designed as per Indian standard codes should be about __________ times.the design pressure.

A

1.5 to 2

46
Q

Flanges are connected to pipes by

A

all (a), (b) and (c)

47
Q

The ratio of down take area to cross-sectional area of the tube, for calendria type evaporator ranges from

A

0.5 to 1

48
Q

Shortest distance between two tubes is

A

called tube clearance.

ED & PD (8 decks)

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