Hydraulic Machines problems
- 1. The working of which of the following hydraulic units is based on Pascal's law?
Options- A. Air lift pump
- B. Jet pump
- C. Hydraulic coupling
- D. Hydraulic press Discuss
Correct Answer: Hydraulic press
- 2. The power developed by a turbine is (where H = Head of water under which the turbine is working)
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 H3/2
- 3. Which of the following pump is generally used to pump highly viscous fluid?
Options- A. Centrifugal pump
- B. Reciprocating pump
- C. Air lift pump
- D. Screw pump Discuss
Correct Answer: Screw pump
- 4. A Pelton wheel working under a constant head and discharge, has maximum efficiency when the speed ratio is
Options- A. 0.26
- B. 0.36
- C. 0, 46
- D. 0.56 Discuss
Correct Answer: 0, 46
- 5. The efficiency of jet propulsion for a ship with inlet orifices at right angles to the direction of motion of ship, will be maximum when the relative velocity of the jet and ship is equal to twice the velocity of the ship.
Options- A. Yes
- B. No Discuss
Correct Answer: Yes
- 6. The flow ratio of Francis turbine is defined as the ratio of the
Options- A. velocity of flow at inlet to the theoretical jet velocity
- B. theoretical velocity of jet to the velocity of flow at inlet
- C. velocity of runner at inlet to the velocity of flow at inlet
- D. none of the above Discuss
Correct Answer: velocity of flow at inlet to the theoretical jet velocity
- 7. A draft tube is used with impulse turbines.
Options- A. Yes
- B. No Discuss
Correct Answer: No
- 8. The discharge through a reaction turbine __________ with the increase in unit speed.
Options- A. remains same
- B. increases
- C. decreases Discuss
Correct Answer: decreases
- 9. Power required to drive a centrifugal pump is __________ proportional to N3.
Options- A. directly
- B. inversely Discuss
Correct Answer: directly
- 10. A jet of water enters and leaves a fixed curved vane tangentially. The force of jet along perpendicular to the vane is zero.
Options- A. True
- B. False Discuss
Correct Answer: False
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