1. Convert 950R to K
a. 490.33 K
b. 596.44 K
c. 220.33 K
d. 527.44 K*
2. Find the pressure at the 80 fathom depth of water in kpag.
a. 1,435.17 kpag*
b. 1,693.17 kpag
c. 1,742.35 kpag
d. 1,293.35 kpag
3. Helium
...
1. Convert 950R to K
a. 490.33 K
b. 596.44 K
c. 220.33 K
d. 527.44 K*
2. Find the pressure at the 80 fathom depth of water in kpag.
a. 1,435.17 kpag*
b. 1,693.17 kpag
c. 1,742.35 kpag
d. 1,293.35 kpag
3. Helium gas is compressed in an adiabatic compressor from an initial state of 14 psia and
50oF to a final temperature of 320oF in a reversible manner. Determine the exit pressure of
Helium.
a. 54.5 psia
b. 40.49 psia*
c. 35.8 psia
d. 69.8 psia
4. 3.0 lbm of air are contained at 25 psia and 100 °F. Given that Rair = 53.35 ft-lbf / lbm-°F,
what is the volume of the container?
a. 30.7 ft3
b. 17.5 ft3
c. 24.89 ft3*
d. 22.3 ft3
5. A perfect gas has a value of R= 58.8 ft-lb/lb-R and K= 1.26. if 20 Btu are added to 10 lbs of
his gas at constant volume when initial temperature is 90 degF find the final temperature.
a. 177 degF
b. 97 degF*
c. 143 degF
d. 85 degF
6. A spherical balloon with a diameter of 6 m is filled with helium at 20 deg. C and 200 Kpa.
Determine the mole number.
a. 17.56 Kmol
b. 25.39 Kmol
c. 9.28 Kmol*
d. 19.61 Kmol
7. Find the mass of carbon dioxide having a pressure of 20 psia at 200F with 10ft^3 volume.
a. 1.34 lbs
b. 1.04 lbs
c. 1.24 lbs *
d. 1.14 lbs
8. Steam turbine is receiving 1014 lbm/hr of steam, determine the horsepower output of the
turbine if the work done by steam is 255 btu/lbm
a. 102 HP*
b. 462.8 HP
c. 200 HP
d. 6003.7 HP
9. Find the work possess for a Helium gas at 200CA. 609 KJ/kg *
B. 168 KJ/kg
C. 229 KJ/kg
D. 339 KJ/kg
10. The gain of entropy during isothermal nonflow process of 5 lb of air at 60 is 0.462 Btu/R.
Find the V1/V2.
A. 3.85
B. 0.259*
C. 1.0
D. 0.296
11. Oil flow through a 16 tubes on a single cooler with a velocity of 2 m/s, the internal diameter
of the tube is 30mm and oil density is 0.85gm/ml. Find the volume flow in liters per sec.
A. 22.62 *
B. 32.22
C. 62.22
D. 42.62
12. 438K is _____˚F
a 213˚F
b 329˚F*
c 113˚F
d 1156˚F
13. Find the mass of ammonia (NH3) in a 5m3 vessel having a pressure of 120kpa and 20˚C.
a 4.187 kg*
b 3.763 kg
c 2.837 kg
d 1.563 kg
14. Find the specific volume of air having 90˚F and 15 psi conditions.
a 11.57 ft3/lb
b 13.57 ft3/lb
c 15.57 ft3/lb
d 17.57 ft3/lb
15. Air at 4m3 and 120kpa undergoes an isothermal process until the pressure is 400 kpa. Find
the final volume.
a 1.2 m3
b 1.5 m3
c 1.8 m3
d 2.1 m3
16. A steam enters the system with enthalpy of 3300 KJ/kg at 200m/s and leaves with enthalpy
at 2700 KJ/kg at 80m/s. Find the work output of the turbine.
a 616.8 KJ/kg*
b 313.9 KJ/kg
c 442.2KJ/kg
d 978 KJ/kg
17. Two pounds per second steam enters the turbine at 500ft/s with 600 Btu/lb enthalpy and
leaves at 200 ft/s and 500Btu/lb. If heat loss is 5000Btu/hr, find the horsepower output of
the turbine.
a 458.14
b 292.92*
c 478.14
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