Q.1

The runaway speed of a hydraulic turbine is the speed

  • at full load
  • at which there will be no damage to the runner
  • corresponding to maximum overload permissible
  • at which the turbine will run freely without load
Q.2

In a Francis turbine runner, the number of blades are generally between

  • 2 to 4
  • 4 to 8
  • 8 to l6
  • 16 to 24
Q.3

A hydraulic accumulator is a device used to store __________ energy which may be supplied to a machine later on.

  • strain
  • pressure
  • kinetic
Q.4

In a Francis turbine runner, the number of blades are generally between

  • 2 to 4
  • 4 to 8
  • 8 to l6
  • 16 to 24
Q.5

A Pelton wheel working under a constant head and discharge, has maximum efficiency when the speed ratio is

  • 0.26
  • 0.36
  • 0, 46
  • 0.56
Q.6

A hydraulic ram is a device used to

  • store the energy of water
  • increase the pressure of water
  • to lift water from deep wells
  • to lift small quantity of water to a greater height when a large quantity of water is available at a smaller height
Q.7

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

  • Correct
  • Incorrect
Q.8

Which of the following pump is generally used to pump highly viscous fluid?

  • Centrifugal pump
  • Reciprocating pump
  • Air lift pump
  • Screw pump
Q.9

Which of the following statement is correct ?

  • The centrifugal pump is suitable for large discharge and smaller heads.
  • The centrifugal pump requires less floor area and simple foundation as compared to reciprocating pump.
  • The efficiency of centrifugal pump is less as compared to reciprocating pump.
  • all of the above
Q.10

A Kaplan turbine is preferred for a specific speed oftor.p.m.

  • Yes
  • No
Q.11

Which of the following pump is successfully used for lifting water to the turbines?

  • Centrifugal pump
  • Reciprocating pump
  • Jet pump
  • Air lift pump
Q.12

Which of the following statement is correct ?

  • all of the above
  • The centrifugal pump is suitable for large discharge and smaller heads.
  • The centrifugal pump requires less floor area and simple foundation as compared to reciprocating pump.
  • The efficiency of centrifugal pump is less as compared to reciprocating pump.
Q.13

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

  • True
  • False
Q.14

The cavitation in a hydraulic machine

  • causes noise and vibration of various parts
  • reduces the discharge of a turbine
  • causes sudden drop in power output and efficiency
  • all of the above
Q.15

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

  • True
  • False
Q.16

The relation between hydraulic efficiency (ηh), mechanical efficiency (ηm) and overall efficiency (ηo) ) is

  • ηh = ηo x ηm
  • ηm = ηo x ηh
  • ηo = ηh x ηm
  • none of these
Q.17

The Furneyron turbine is __________ reaction turbine.

  • an axial flow
  • an inward flow
  • an outward flow
  • a mixed flow
Q.18

Overall efficiency of a centrifugal pump is the ratio of

  • energy available at the impeller to the energy supplied to the pump by the prime mover
  • actual workdone by the pump to the energy supplied to the pump by the prime mover
  • energy supplied to the pump to the energy available at the impeller
  • manometric head to the energy supplied by the impeller per kN of water
Q.19

A Pelton wheel is

  • tangential flow impulse turbine
  • inward flow impulse turbine
  • outward flow impulse turbine
  • inward flow reaction turbine
Q.20

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
Q.21

Form head of water, __________ shallbeused.

  • Pelton wheel
  • Kaplan turbine
  • Francis turbine
  • none of these
Q.22

Which of the following is not a reaction turbine?

  • Furneyron turbine
  • Jonval turbine
  • Thomson's turbine
  • Pelton wheel
Q.23

The flow ratio of Francis turbine is defined as the ratio of the

  • velocity of flow at inlet to the theoretical jet velocity
  • theoretical velocity of jet to the velocity of flow at inlet
  • velocity of runner at inlet to the velocity of flow at inlet
  • none of the above
Q.24

The type of centrifugal pump preferred for a specific speed ofr.p.m. is

  • slow speed pump with radial flow at outlet
  • medium speed pump with radial flow at outlet
  • high speed pump with radial flow at outlet
  • high speed pump with axial flow at outlet
Q.25

The discharge through a turbine is

  • directly proportional to H1/2
  • inversely proportional to H1/2
  • directly proportional to H3/2
  • inversely proportional to H3/2
Q.26

The action of a centrifugal pump is that of a reversed reaction turbine.

  • Correct
  • Incorrect
Q.27

A jet of water is striking at the centre of a curved vane moving with a uniform velocity in the direction of jet. For the maximum efficiency, the vane velocity is __________ of the jet velocity

  • one-half
  • one-third
  • two-third
  • three-fourth
Q.28

If the net positive suction head (NPSH) requirement for the pump is not satisfied, then

  • no flow will take place
  • cavitation will be formed
  • efficiency will be low
  • excessive power will be consumed
Q.29

The speed of a turbine runner is

  • directly proportional to H1/2
  • inversely proportional to H1/2
  • directly proportional to H3/2
  • inversely proportional to H3/2
Q.30

Which of the following pump is preferred for flood control and irrigation applications?

  • Centrifugal pump
  • Axial flow pump
  • Mixed flow pump
  • Reciprocating pump
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