Power, efficiency, and performance calculations for compressors, blowers, and pumps

Notes

1. An air compressor which operates at 900 rpm has a piston displacement of 4500 cm³. Determine the mass flow rate of air at standard density considering that the volumetric efficiency is 77%. a. 224.53 kg/hr b. 324.35 kg/hr c. 314.57 kg/hr d. 137.54 kg/hr 2. If the power to drive shaft is 7 Hp and the mechanical efficiency is 75%, what is the actual compressor power? a. 5 HP b. 3 HP c. 2 HP d. 4 HP 3. A blower operating at 15,000 rpm compresses air from 68°F and 14.7 psia to 10 psig. The design flow is 1350 cfm and at this point the BHp is 80. Determine the efficiency of the blower at the design point. a. 48.41 HP b. 40.54 HP c. 55.62 HP d. 57.65 HP 4. A pump delivers 20 cfm of water having a density of 62 lb/ft³. The suction and discharge gage reads 5 in. Hg vacuum and 30 psi respectively. The discharge gage is 5 ft above the suction gage. If pump efficiency is 70%, what is the motor power? a. 5.31 HP b. 3.31 HP c. 4.31 HP d. 6.31 HP 5. A double suction centrifugal pump delivers 3 m³/s of water at a head of 15 m and running at 1200 rpm. Calculate the specific speed of the pump. a. 9958.46 rpm b. 12,110.64 rpm c. 16,000 rpm d. 17,000 rpm 6. A turbo compressor is a gas turbine plan...