Hydraulic Machines problems
- 1. Theoretical power required (in watts) to drive a reciprocating pump is (where w = Specific weight of liquid to be pumped in N/m3, Q = Discharge of the pump in m3/s, Hs = Suction head in metres, and Hd = Delivery head in metres)
Options- A. wQHs
- B. wQHd
- C. wQ(Hs - Hd)
- D. wQ(Hs + Hd) Discuss
Correct Answer: wQ(Hs + Hd)
- 2. Slip of a reciprocating pump is defined as the
Options- A. ratio of actual discharge to the theoretical discharge
- B. sum of actual discharge and the theoretical discharge
- C. difference of theoretical discharge and the actual discharge
- D. product of theoretical discharge and the actual discharge Discuss
Correct Answer: difference of theoretical discharge and the actual discharge
- 3. A Pelton wheel develops 1750 kW under a head of 100 metres while running at 200 r.p.m. and discharging 2500 litres of water per second. The unit power of the wheel is
Options- A. 0.25 kW
- B. 0.75 kW
- C. 1.75 kW
- D. 3.75 kW Discuss
Correct Answer: 1.75 kW
- 4. The speed of a turbine runner is
Options- A. directly proportional to H1/2
- B. inversely proportional to H1/2
- C. directly proportional to H3/2
- D. inversely proportional to H3/2 Discuss
Correct Answer: directly proportional to H1/2
- 5. The maximum efficiency of jet propulsion of a ship with inlet orifices at right angles to the direction of motion of ship, is
Options- A. 40%
- B. 50%
- C. 60%
- D. 80% Discuss
Correct Answer: 50%
- 6. Discharge of a centrifugal pump is (where N = Speed of the pump impeller)
Options- A. directly proportional to N
- B. inversely proportional to N
- C. directly proportional to N2
- D. inversely proportional to N2 Discuss
Correct Answer: directly proportional to N
- 7. Discharge of a centrifugal pump is
Options- A. directly proportional to diameter of its impeller
- B. inversely proportional to diameter of its impeller
- C. directly proportional to (diameter)2 of its impeller
- D. inversely proportional to (diameter)2 of its impeller Discuss
Correct Answer: inversely proportional to (diameter)2 of its impeller
- 8. Geometric similarity is said to exist between the model and the prototype, if both of them
Options- A. have identical velocities
- B. are equal in size and shape
- C. are identical in shape, but differ only in size
- D. have identical forces Discuss
Correct Answer: are identical in shape, but differ only in size
- 9. The unit discharge through the turbine is
Options- A.
- B.
- C.
- D.
Discuss
Correct Answer:
- 10. A centrifugal pump will start delivering liquid only when the pressure rise in the impeller is equal to the
Options- A. kinetic head
- B. velocity head
- C. manometric head
- D. static head Discuss
Correct Answer: manometric head
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