Q.1

A Pelton wheel developskW under a head ofmetres while running atr.p.m. and discharginglitres of water per second. The unit discharge of wheel is

  • 0.25 m3/s
  • 0.5 m3/s
  • 1.5 m3/s
  • 2.5 m3/s
Q.2

In order to avoid cavitation in centrifugal pumps

  • the suction pressure should be high
  • the delivery pressure should be high
  • the suction pressure should be low
  • the delivery pressure should be low
Q.3

Which of the following statement is wrong ?

  • The reaction turbines are used for low head and high discharge.
  • The angle of taper on draft tube is less than 8°.
  • An impulse turbine is generally fitted slightly above the tail race.
  • A Francis turbine is an impulse turbine.
Q.4

A double overhung Pelton wheel has

  • two jets
  • two runners
  • four jets
  • four runners
Q.5

Which of the following pump is suitable for small discharge and high heads?

  • Centrifugal pump
  • Axial flow pump
  • Mixed flow pump
  • Reciprocating pump
Q.6

A Pelton wheel developskW under a head ofmetres while running atr.p.m. and discharginglitres of water per second. The unit discharge of wheel is

  • 0.25 m3/s
  • 0.5 m3/s
  • 1.5 m3/s
  • 2.5 m3/s
Q.7

In a centrifugal pump, the regulating valve is provided on the

  • casing
  • delivery pipe
  • suction pipe
  • impeller
Q.8

The Thomson's turbine is __________ reaction turbine.

  • an axial flow
  • an inward flow
  • an outward flow
  • a mixed flow
Q.9

The flow ratio in case of Francis turbine varies from

  • 0.15 to 0.3
  • 0.4 to 0.5
  • 0.6 to 0.9
  • 1 to 1.5
Q.10

In a centrifugal pump, the regulating valve is provided on the

  • casing
  • delivery pipe
  • suction pipe
  • impeller
Q.11

Delivery head of a centrifugal pump is

  • directly proportional to N
  • inversely proportional to N
  • directly proportional to N2
  • inversely proportional to N2
Q.12

A hydraulic intensifier is a device used to increase the intensity of pressure of water by means of energy available from a large quantity of water at a low pressure.

  • Correct
  • Incorrect
Q.13

Which of the following statement is correct as regard to water wheels?

  • They have slow speeds.
  • They are suitable even for low water heads.
  • They give constant efficiency, even if the discharge is not constant
  • all of the above
Q.14

The gross or total head of the turbine is the __________ of the water levels at the head race and tail race.

  • sum
  • difference
  • product
Q.15

A Francis turbine is an outward flow reaction turbine.

  • True
  • False
Q.16

Which of the following turbine is preferred for a specific speed oftor.p.m.?

  • Pelton wheel
  • Francis turbine
  • Kaplan turbine
  • none of these
Q.17

In a reaction turbine, the water enters the wheel under pressure and flows over the vanes.

  • Correct
  • Incorrect
Q.18

In a reaction turbine, the water enters the wheel under pressure and flows over the vanes.

  • Correct
  • Incorrect
Q.19

Head developed by a centrifugal pump is

  • proportional to diameter of impeller
  • proportional to speed of impeller
  • proportional to diameter and speed of impeller
  • none of the above
Q.20

Head developed by a centrifugal pump is

  • proportional to diameter of impeller
  • proportional to speed of impeller
  • proportional to diameter and speed of impeller
  • none of the above
Q.21

The specific speed of a centrifugal pump may be defined as the speed of an imaginary pump, identical with the given pump, which will discharge one litre of water, while it is being raised through a head of one metre.

  • True
  • False
Q.22

If the ratio of all the corresponding linear dimensions are equal, then the model and the prototype are said to have

  • geometric similarity
  • kinematic similarity
  • dynamic similarity
  • none of these
Q.23

The ratio of the normal force of jet of water on a plate inclined at an angle ofas compared to that when the plate is normal to jet, is

  • 1/2
  • 1/2
  • 1
  • 2
Q.24

In a centrifugal pump, the water enters the impeller __________ and leaves the vanes axially.

  • axially
  • radially
Q.25

The depth of the bucket for a Pelton wheel is generally __________ the diameter of jet.

  • equal to
  • 1.2 times
  • 1.8 times
  • double
Q.26

A jet of water enters and leaves a fixed curved vane tangentially. The force of the jet along normal to the vane is (where α and β = Inlet and outlet angles of the jet respectively)

Q.27

The number of buckets on the periphery of a Pelton wheel is given by

Q.28

A Kaplan turbine is an axial flow reaction turbine.

  • Correct
  • Incorrect
Q.29

An impulse turbine is used for

  • low head of water
  • high head of water
  • medium head of water
  • high discharge
Q.30

By fitting an air vessel to the reciprocating pump, there is always a saving of work done and subsequently saving of power. This saving in case of a single acting reciprocating pump is

  • 39.2%
  • 48, 8%
  • 84.8%
  • 88.4%
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