Hydraulic Machines Online Quiz - ObjectiveBooks

# Hydraulic Machines Online Quiz

1. A jet of water enters and leaves a fixed curved vane tangentially. The force of jet along perpendicular to the vane is zero.
True
False

2. The speed ratio of a Francis turbine is defined as the ratio of the theoretical jet velocity to the peripheral speed at inlet.
Yes
No

3. A reciprocating pump is suitable for less discharge and higher heads.
True
False

4. In a Francis turbine, the pressure at inlet is ________ that at outlet.
Less than
More than

5. 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.
Yes
No

6. Delivery head of water of a centrifugal pump is inversely proportional to diameter of its impeller.
Yes
No

7. A Kaplan turbine is an axial flow reaction turbine.
Correct
Incorrect

8. 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.
Yes
No

9. In a mixed flow centrifugal pump, the flow through the impeller is a combination of radial and axial flows.
Correct
Incorrect

10. A Francis turbine is an outward flow reaction turbine.
True
False

11. Power required to drive a centrifugal pump is ________ proportional to N3.
Directly
Inversely

12. The efficiency of a reaction turbine for a given head _________ with the increase in speed.
Decreases
Increases

13. In an impulse turbine, the pressure of water both at entering and leaving the vanes, is atmospheric.
Agree
Disagree

14. Manometric head is the actual head of water against which a centrifugal pump has to work.
Correct
Incorrect

15. A reciprocating pump is also called a ________ displacement pump.
Positive
Negative

16. A Kaplan turbine is preferred for a specific speed of 300 to 1000 r.p.m.
Yes
No

17. In the casing of a centrifugal pump, the kinetic energy of the water is converted into pressure energy before the water leaves the casing.
True
False

18. The head available at the inlet of the turbine is known as net or effective head.
Correct
Incorrect

19. The power of a centrifugal pump working under constant head and discharge increases with the speed.
True
False

20. The air vessel, in a reciprocating pump, is a cast iron closed chamber having an opening at its base.
Agree
Disagree

Score =