Hydraulic Machines Online Quiz - ObjectiveBooks
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# Quiz Questions

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

02. The speed ratio of a Francis turbine is defined as the ratio of the theoretical jet velocity to the peripheral speed at inlet.

03. A reciprocating pump is suitable for less discharge and higher heads.

04. In a Francis turbine, the pressure at inlet is ________ that at outlet.

05. 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.

06. Delivery head of water of a centrifugal pump is inversely proportional to diameter of its impeller.

07. A Kaplan turbine is an axial flow reaction turbine.

08. 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.

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

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

11. Power required to drive a centrifugal pump is ________ proportional to N^3.

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

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

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

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

16. A Kaplan turbine is preferred for a specific speed of 300 to 1000 r.p.m.

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.

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

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

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

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