2. A reciprocating compressor draws in 500 cubie feet per minute of air whose density is 0.079 lb/cu ft and discharges it with a density of 0.304 Ib/cu ft. At the suction, P, = 15 psia; at discharge, P, = 80 psia. The increase in the specific internal energy is 33.8 Btu/lb and the heat transferred from the air by cooling is 13 Btulb. Determine the work on the air in Btu/min and in hp. Neglect change in kinetie energy. Ans. 56.25 hp

2. A reciprocating compressor draws in 500 cubie feet per minute of air whose density is 0.079 lb/cu ft and discharges it with a density of 0.304 Ib/cu ft. At the suction, P, = 15 psia; at discharge, P, = 80 psia. The increase in the specific internal energy is 33.8 Btu/lb and the heat transferred from the air by cooling is 13 Btulb. Determine the work on the air in Btu/min and in hp. Neglect change in kinetie energy. Ans. 56.25 hp

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...

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A 50 kW induction motor is operated at a lagging power factor of 0.8, the source voltage being 230 V rms. a) Find the complex power S that this motor is using b) In order to get lower electrcity bill it is desired to connecta parallel compensator to the motor so as to get pf-0.95 lagging and still provide the 50kW real power for the motor. Determine the total complex power S S+ S, that will achieve the desired pf, where Sc is the power of the compensator ) Determine the complex power S. of the compensator and the value of the parallel compensator impedance. What type of circuit element should be the compensator?
If some AC load is turned on and consumes a current =0.4 A, and electrical power produced from conversion of hydro plant =160W , and efficiency=60%, find: PL of AC load, and Pm of the hydro plant……….. Calculate the hydraulic power entering the distributor if the mass flow rate=0.5 kg/s , the head of the power plant=20m. ……………
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