MOMENTRA Flashcards
(5 cards)
Calculate the pressure drop when 3 kg/s of sulfuric acid flows through 60 m of
25 mm pipe. Density = 1840 kg/m3 and viscosity = 0.025 Ns/m2. Roughness is taken as
0.05 mm.
A. 900 kPa C. 200 kPa
B. 700 kPa D. 500 kPa
A. 900 kPa
Natural gas which may be assumed to be methane is to be transferred through a 100-
mile section of a 40 in ID pipeline at a rate of 150000000 cu. ft per 24 hr,
measured at 600F and standard atmospheric pressure. The gas is delivered to the
compressor at substantially atmospheric pressure and 600F and is to at 10 psig
pressure at the discharge end of the line. Assume methane to be ideal gas.
- Calculate the pressure at the compressor exit.
A. 97 psia C. 88 psia
B. 82 psia D. 92 psia - What power is required for pumping?
A. 12900 hp C. 11100 hp
B. 15300 hp D. 14800 hp
D. 92 psia
B. 15300 hp
A horizontal tubular type of boiler uses crude oil consisting substantially of
hydrocarbons. The oil is available at 700F and has a specific gravity of 0.90 and
viscosity of 50 cP. In actual operation, water is fed to the boiler at a temperature
600F and vaporized to form steam at a gauge pressure of 100 psi and 98% quality of
steam at a steam generation rate of 10 lb of steam per lb of oil fired. The average
analysis of the flue gases is as follows: CO2= 11%; CO = 0.5%; O2 = 6%; and N2 =
82.5%. At normal running rate the boiler generates 3450 lb of steam per hour. The
boiler water is available from a well 30 ft below the feed line and the water line
consists of 200 ft (total and equivalent) of 1-in standard steel pipe. The oil feed
comes from a reservoir under a suitable head. The feed line consists of standard
3/4 in steel pipe. Calculate the Reynold number of the oil.
A. 77 C. 84
B. 53 D. 60
B. 53
A centrifuge bowl is spinning at a constant 1500 rev/min. What radius bowl is
needed for a force of 500 g’s.
A. 0.1 m C. 0.3 m
B. 0.2 m D. 0.4 m
A venturi meter is installed to measure the flow rate of water in a 178 mm
diameter (ID) pipe. The throat diameter is 102 mm. The differential pressure
measured using a manometer is 154.3 kN/m2. The data given are: discharge coefficient
= 0.98; water density = 1000 kg/m3. The volumetric flow rate of water (in m3/s) is
A. 0.28 C. 0.06
B. 0.15 D. 0.33
B. 0.15
