Hydraulic Machines problems
- 1. In the casing of a centrifugal pump, the kinetic energy of the water is converted into pressure energy before the water leaves the casing.
Options- A. True
- B. False Discuss
Correct Answer: True
- 2. For centrifugal pump impeller, the maximum value of the vane exit angle is
Options- A. 10° to 15°
- B. 15° to 20°
- C. 20° to 25°
- D. 25° to 30° Discuss
Correct Answer: 20° to 25°
- 3. The specific speed of a centrifugal pump, delivering 750 litres of water per second against a head of 15 metres at 725 r.p.m., is
Options- A. 24.8 r.p.m.
- B. 48.2 r.p.m
- C. 82.4 r.p.m.
- D. 248 r.p.m Discuss
Correct Answer: 82.4 r.p.m.
- 4. When the speed of the pump increases, its net positive suction head (NPSH) requirement decreases.
Options- A. Agree
- B. Disagree Discuss
Correct Answer: Disagree
- 5. The speed ratio of a Francis turbine is defined as the ratio of the theoretical jet velocity to the peripheral speed at inlet.
Options- A. Yes
- B. No Discuss
Correct Answer: No
- 6. The static head of a centrifugal pump is equal to the __________ of suction head and delivery head.
Options- A. product
- B. difference
- C. sum Discuss
Correct Answer: sum
- 7. Delivery head of water of a centrifugal pump is inversely proportional to diameter of its impeller.
Options- A. Yes
- B. No Discuss
Correct Answer: No
- 8. The efficiency of a Pelton wheel working under constant head __________ with the increase in power.
Options- A. remains same
- B. increases
- C. decreases Discuss
Correct Answer: increases
- 9. The discharge of a double acting reciprocating pump is (where L = Length of stroke, A = Cross-sectional area of piston, and N = Speed of crank in r.p.m.)
Options- A. L.A.N
- B. 2 L.A.N
- C.
- D.
Discuss
Correct Answer:
- 10. The maximum number of jets, generally, employed in an impulse turbine without jet interference are
Options- A. two
- B. four
- C. six
- D. eight Discuss
Correct Answer: six
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