Power Engineering - 4B2 Practice Exam Questions With Outlined Answers

Power Engineering - 4B2 Practice Exam Questions With Outlined Answers Q.When a reciprocating pump delivers fluid every second stroke of its piston, it is called a ___________ pump: a. Positive displacement b. Single acting c. Two-stage d. Double acting - ANSWERS-b. Single acting Q.When a pump discharges into a vessel operating at 300 kPa, the 300 kPa is referred to as: a. Dynamic head b. Pressure head c. Discharge head d. Friction head - ANSWERS-b. Pressure head Q.A reciprocating air compressor works on the principle of: a. Pressure reduction b. Centrifugal force c. Volumetric expansion d. Volume reduction - ANSWERS-d. Volume reduction Q.A volute type pump: a. Is a positive displacement pump b. Has a spiral casing with an increasing cross sectional area. c. Reduces the velocity in the discharge nozzle d. Is a regenerative type pump - ANSWERS-b. Has a spiral casing with an increasing cross sectional area. Q.A diffuser pump: a. Does not have a volute b. Does not have to be primed c. Has high suction lift d. Is more effective at changing velocity to pressure than a volute pump - ANSWERS-d. Is more effective at changing velocity to pressure than a volute pump Q.Positive displacement compressors: a. Cannot deliver pulsation-free air b. Must have suction and discharge valves c. Must all use internal lubrication d. Could be single stage with three cylinders - ANSWERS-d. Could be single stage with three cylinders Q.Compressed air tools tend to be: a. Heavier than equivalent electrical tools b. Damaged by overloading c. Hot after prolonged operation d. More expensive than electrical tools - ANSWERS-d. More expensive than electrical tools Q.The compressor that would favour volume over pressure would be the: a. Rotary lobe b. Screw c. Centrifugal d. Sliding vane - ANSWERS-c. Centrifugal Q.Which type of pump produces the greatest suction? a. A volute centrifugal pump b. A centrifugal pump