Compute the humidity ratio of air considering the
density at 35 °C and 101 kPa is 1.05 kg/m3.
A. 0.036 kgvapor /kgair
B. 0.064 kgvapor /kgair
C. 0.36 kgvapor /kgair
D. 0.63 kgvapor /kgair
1.08
Correction!
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Compute the humidity ratio of air considering the density at 35 °C and 101 kPa is 1.05 kg/m3. A. 0.036 kg vapor /kg air B. 0.064 kg vapor /kg air C. 0.36 kg vapor /kg air D. 0.63 kg vapor /kg air
Correction!
If atmospheric air 14.7 psia and 60 °F at sea level, what is the pressure at 12000 ft altitude if air is incompressible. Note: @ 60 °F: the density of air is 0.0763 lbm/ft 3 ; P 1 = 14.7 psia. A. 5.467 psia B. 9.53 psia C. 8.342 psia D. 2.346 psia
P
2
= P
1
e
h 1 - h 2 RT Formula: compressible Correction!
A two-pass surface condenser is to be designed using overall heat transfer coefficient of 480 Btu/°F-ft 2 of outside tube surface. The tubes are to be 1 inch outside diameter with 1/16 in walls (or 7/ in. inside diameter). Entering circulating water velocity is to be 6 ft/s. steam enters the condenser at a rate of 100,000 lb/hr at a pressure of one psia and an enthalpy of 1090 Btu/lb. Condensate leaves at saturated liquid at one psia. Circulating water enters the condenser at 85 deg. F and leaves at 95 deg F. Note: 1 psia condensate has temperature of 101.7 deg. F. Wet steam entering becomes condensate at 101.7 deg. F with hf = 69.72 Btu/lb. Calculate the number of tubes to be used in each pass. A. 18, 200 tubes B. 15, 400 tubes C. 10, 450 tubes D. 11, 456 tubes
A two-pass surface condenser is to be designed using overall heat transfer coefficient of 480 Btu/°F-ft 2 of outside tube surface. The tubes are to be 1 inch outside diameter with 1/16 in walls (or 7/ in. inside diameter). Entering circulating water velocity is to be 6 ft/s. steam enters the condenser at a rate of 100,000 lb/hr at a pressure of one psia and an enthalpy of 1090 Btu/lb. Condensate leaves at saturated liquid at one psia. Circulating water enters the condenser at 85 deg. F and leaves at 95 deg F. Note: 1 psia condensate has temperature of 101.7 deg. F. Wet steam entering becomes condensate at 101.7 deg. F with hf = 69.72 Btu/lb. Calculate the total length of the tube to be used in ft. A. 123, 000 ft B. 324, 000 ft C. 742, 000 ft D. 543, 000 ft
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A sudden enlargement in a circular duct measures 0.20 m diameter upstream and 0.40 m downstream. The upstream pressure is 150 Pa, downstream pressure is 200 Pa. What is the flow rate of 20 °C of air through the fitting? p = 1.02041 kg/m3. A. 0.49 m 3 /s B. 0.83 m 3 /s C. 0.38 m 3 /s D. 0.94 m 3 /s Correction!
Four thousand liters per hour of distillates are to be cooled from 21°C to -12°C and 12% of wax by weight is separated out at 15°C. The specific heat of oil is 2 kJ/kg°C and S.G. is 0.87. The specific heat of the wax is 2.5 and the latent heat of fusion is 290 kJ/kg. Allow 10% for the losses, find the capacity of the refrigerating machine A. 20 TOR B. 51.08 TOR C. 40 TOR D. 31.08 TOR
A cylindrical flash tank mounted with its axis horizontal is used to separate liquid ammonia from ammonia vapor. The ammonia vapor bubbles through the liquid with 70 m 3 /min leaving the disengaging surface. The disengaging rate is limited to 60 m/min and the liquid level is to operate with the liquid level of one-third o the diameter from the top. Determine the diameter if the tank is 1.5 m long. A. 830 mm B. 730 mm C. 860 mm D. 760 mm
Hot gases at 280°C flow on one side of a metal plate of 10 mm thickness and air at 35°C flows on the other side. The heat transfer coefficient of the gases is 31. W/m 2 -K and that of the air is 32 W/m 2 -K. Calculate the over-all transfer coefficient A. 15.82 W/m 2 -K B. 16.82 W/m 2 -K C. 14.82 W/m 2 -K D. 17.82 W/m 2 -K
Missing! k metal = 50 W/m 2 -K
With three different quantities x, y and z of the same kind of liquid of temperatures 9, 21 and 38°C respectively, it is found that when x and y are mixed together the resultant temperature is 17°C and when y and z are mixed together the resultant temperature is 28°C. Find the resultant temperature if x and z were mixed. A. 29.87 °C B. 25.92 °C C. 20.85 °C D. 24.86 °C
Wet saturated steam at 16 bar (hf = 859 kJ/kg, hfg = 1935 kJ/kg) reducing valve and is throttled to a pressure of 8 bar (hf = 721 kJ/kg, hfg = 2048 kJ/kg). Find the dryness fraction of the reduced pressure steam. A. 0. B. 0. C. 0.9933 by observation, dryness of steam ranges from 90 – 100% ???) D. 0.
Missing! x 1 = 0.
A boiler contains 3.5 tons of water initially having 40 ppm dissolved solids and after 24 hrs the dissolve solids in the water is 2500 ppm. If the feed rate is 875 kg/hr, find the ppm of dissolved solids contained in the feed water. A. 410 ppm B. 320 ppm C. 390 ppm D. 420 ppm
Kerosene is the fuel of a gas turbine plant: fuel-air ratio, m f
= 0.012, T
3 = 972 K, pressure ratio, r p
exhaust to atmosphere. Find the available energy in KJ per kg air flow. Assume k = 1.34 and C p
A. 352.64 kJ/kg B. 452.64 kJ/kg C. 252.64 kJ/kg D. 552.64 kJ/kg
Correction!
A pelton wheel runs at constant speed under a head of 650 ft. the cross-sectional area of the jet is 0.50 ft 2 and the nozzle loss is to be neglected. Suppose the needle of the nozzle is to be adjusted as to reduce the area of the jet from 0.50 ft 2 to 0.20 ft 2
. Under these conditions the efficiency of the wheel is known to be 70%. Find the power output of the wheel A. 2112.34 Hp B. 2506.34 Hp C. 3017.62 Hp D. 3462.74 Hp
Consider only!