Hydraulic Machines problems
- 1. The overall efficiency of an impulse turbine is the ratio of the actual power produced by the turbine to the energy actually supplied by the turbine.
Options- A. Yes
- B. No Discuss
Correct Answer: Yes
- 2. In an inward flow reaction turbine
Options- A. the water flows parallel to the axis of the wheel
- B. the water enters at the centre of the wheel and then flows towards the outer periphery of the wheel
- C. the water enters the wheel at the outer periphery and then flows towards the centre of the wheel
- D. the flow of water is partly radial and partly axial Discuss
Correct Answer: the water enters the wheel at the outer periphery and then flows towards the centre of the wheel
- 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 discharge of wheel is
Options- A. 0.25 m3/s
- B. 0.5 m3/s
- C. 1.5 m3/s
- D. 2.5 m3/s Discuss
Correct Answer: 0.25 m3/s
- 4. By fitting an air vessel to the reciprocating pump, there is always a saving of work done and subsequently saving of power. This saving in case of a single acting reciprocating pump is
Options- A. 39.2%
- B. 48, 8%
- C. 84.8%
- D. 88.4% Discuss
Correct Answer: 84.8%
- 5. In a Francis turbine, the pressure at inlet is __________ that at outlet.
Options- A. less than
- B. more than Discuss
Correct Answer: more than
- 6. Which type of the pump is different from others in the same group?
Options- A. Screw pump
- B. Gear pump
- C. Cam and piston pump
- D. Plunger pump Discuss
Correct Answer: Plunger pump
- 7. In a reciprocating pump, air vessels are used to
Options- A. smoothen the flow
- B. reduce suction head
- C. increase delivery head
- D. reduce acceleration head Discuss
Correct Answer: reduce acceleration head
- 8. The unit power developed by a turbine is (where P = Power developed by the turbine under a head of water (H))
Options- A.
- B.
- C.
- D.
Discuss
Correct Answer:
- 9. In a mixed flow reaction turbine, the flow of water is partly radial and partly axial.
Options- A. Correct
- B. Incorrect Discuss
Correct Answer: Correct
- 10. Overall efficiency of a centrifugal pump is the ratio of
Options- A. energy available at the impeller to the energy supplied to the pump by the prime mover
- B. actual workdone by the pump to the energy supplied to the pump by the prime mover
- C. energy supplied to the pump to the energy available at the impeller
- D. manometric head to the energy supplied by the impeller per kN of water Discuss
Correct Answer: actual workdone by the pump to the energy supplied to the pump by the prime mover
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