POWER ENGINEERING 3B2 CHAPTER 9 QUESTIONS AND ANSWERS WITH SOLUTIONS 2024/25

_____ on centrifugal air compressors are provided in order to control the amount of air flowing to the impeller and thus control the capacity of the unit. a. Adjustable inlet vanes b. Adjustable diffuser vanes c. Variable frequency drive d. Moving and fixed blades e. Dummy piston. - ANSWER a A compressor driven by a constant speed driver has its output varied by: a. A stop and start switch b. A solenoid valve c. A mercury switch d. Some type of unloading device e. A safety relief valve. - ANSWER d A variable speed control regulates the speed of the _____ from air receiver pressure monitoring. a. Driver b. Compressor crankshaft c. Compressor impellers d. Compressor blades e. Coupling. - ANSWER a The stop and start system is best employed where: a. The air demand is constant b. Th