A single stage air compressor handles 0454 m3s of

9. A single stage air compressor handles 0.454 m3/s of
atmospheric pressure, 27C air and delivers it to a
receiver at 652.75kPa. Its volumetric efficiency is 0.72,
its compression efficiency on an isothermal basis is
0.85 and its mechanical efficiency is 0.90. If it rotates at
350 rpm, what power in kW is required to drive it?
a. 95
b. 112
c. 120
d. 100
10. A single acting air compressor has a volumetric
efficiency of 87% operates at 500 rpm. It takes in air at
100kPa and 30C and discharges it at 600 kPa. The air
handled is 6 m3/min measured at discharge condition.
If compression is isentropic, find the mean effective
pressure in kPa.
11. An air compressor is to compress 8.5 m3/min from
98.56kPa to 985.6kPa. Assuming ideal conditions, and
with n = 1.3, what will be the saving in work due to two
staging?
12. A two-stage compressor receives 0.35 kg/s of air at
100kPa and 269K and delivers it at 5000kPa. Find the
heat transferred in the intercooler.
a. 62.49kW
b. 79.49kW
c. 76.49kW
d. 70.49kW
13. A single acting two-stage air compressor delivers air at
16 bar. The volume flow rate of air entering the
compressor is 17 m3/min with the temperature and
pressure of 33C and 1 bar respectively. If the
compressor is designed for minimum work and
complete intercooling, determine the power required
to drive the first stage if it follows the compression law
of P 𝑉𝑉
1 . 3
= 𝐶𝐶
A. 47kW
B. 27kW
C. 37kW
D. 40kW
14. A fuel pump is delivering 10 gallons per minute of oil
with a specific gravity of 0.83. The total head is 9.14 m,
find how much energy does the pump consumes in kJ
per hour.