Q.1

Slip of a reciprocating pump is defined as the

  • ratio of actual discharge to the theoretical discharge
  • sum of actual discharge and the theoretical discharge
  • difference of theoretical discharge and the actual discharge
  • product of theoretical discharge and the actual discharge
Q.2

The speed of an imaginary turbine, identical with the given turbine, which will develop a unit power under a unit head, is known as

  • normal speed
  • unit speed
  • specific speed
  • none of these
Q.3

In an impulse turbine, the jet of water impinges on the bucket with a low velocity and after flowing over the vanes, leaves with a high velocity.

  • True
  • False
Q.4

The efficiency of a Pelton wheel working under constant head __________ with the increase in power.

  • remains same
  • increases
  • decreases
Q.5

The discharge of a centrifugal pump working under constant head __________ with the speed.

  • increases
  • decreases
Q.6

The efficiency of a centrifugal pump will be maximum when the blades are bent backward.

  • Yes
  • No
Q.7

The maximum number of jets, generally, employed in an impulse turbine without jet interference are

  • two
  • four
  • six
  • eight
Q.8

A Francis turbine is used when the available head of water is

  • 0 to 25 m
  • 25 m to 250 m
  • above 250 m
  • none of these
Q.9

Discharge of a centrifugal pump is

  • directly proportional to diameter of its impeller
  • inversely proportional to diameter of its impeller
  • directly proportional to (diameter)2 of its impeller
  • inversely proportional to (diameter)2 of its impeller
Q.10

For centrifugal pump impeller, the maximum value of the vane exit angle is

  • 10° to 15°
  • 15° to 20°
  • 20° to 25°
  • 25° to 30°
Q.11

Which of the following turbine is preferred for 0 tom head of water?

  • Pelton wheel
  • Kaplan turbine
  • Francis turbine
  • none of these
Q.12

The capacity of a hydraulic accumulator is generally specified as the maximum amount of energy stored.

  • True
  • False
Q.13

Which of the following turbine is preferred for 0 tom head of water?

  • Pelton wheel
  • Kaplan turbine
  • Francis turbine
  • none of these
Q.14

Discharge of a centrifugal pump is (where N = Speed of the pump impeller)

  • directly proportional to N
  • inversely proportional to N
  • directly proportional to N2
  • inversely proportional to N2
Q.15

Multi-stage centrifugal pumps are used to

  • give high discharge
  • produce high heads
  • pump viscous fluids
  • all of these
Q.16

Discharge of a centrifugal pump is (where N = Speed of the pump impeller)

  • directly proportional to N
  • inversely proportional to N
  • directly proportional to N2
  • inversely proportional to N2
Q.17

In a reciprocating pump, air vessels are fitted to the suction pipe and delivery pipe close to the cylinder of the pump.

  • True
  • False
Q.18

The specific speed fromtor.p.m. of a centrifugal pump indicates that the pump is

  • slow speed with radial flow at outlet
  • medium speed with radial flow at outlet
  • high speed with radial flow at outlet
  • high speed with axial flow at outlet
Q.19

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

  • 0.25 kW
  • 0.75 kW
  • 1.75 kW
  • 3.75 kW
Q.20

In a reaction turbine, the pressure head of water, while flowing over the vanes, is converted into kinetic head before leaving the wheel.

  • Agree
  • Disagree
Q.21

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
Q.22

The maximum efficiency of jet propulsion of a ship with inlet orifices at right angles to the direction of motion of ship, is

  • 40%
  • 50%
  • 60%
  • 80%
Q.23

In a reaction turbine, the draft tube is used

  • to run the turbine full
  • to prevent air to enter the turbine
  • to increase the head of water by an amount equal to the height of the runner outlet above the tail race
  • to transport water to downstream
Q.24

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

  • Yes
  • No
Q.25

The specific speed of a centrifugal pump, deliveringlitres of water per second against a head ofmetres atr.p.m., is

  • 24.8 r.p.m.
  • 48.2 r.p.m
  • 82.4 r.p.m.
  • 248 r.p.m
Q.26

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

  • Yes
  • No
Q.27

Discharge (Q) of a centrifugal pump is given by (where D = Diameter of impeller at inlet, b = Width of impeller at inlet, and Vf = Velocity of flow at inlet)

  • Q = π.D.Vf
  • Q = π.b.Vf
  • Q = π.D.b.Vf
  • Q = D.b.Vf
Q.28

A hydraulic coupling belongs to the category of

  • power absorbing machines
  • power developing machines
  • energy transfer machines
  • energy generating machines
Q.29

The static head of a centrifugal pump is equal to the __________ of suction head and delivery head.

  • product
  • difference
  • sum
Q.30

Manometric head, in case of a centrifugal pump, is equal to

  • Suction lift + Loss of head in suction pipe due to friction + Delivery lift + Loss of head in delivery pipe due to friction + Velocity head in the delivery pipe
  • Workdone per kN of water - Losses within the impeller
  • Energy per kN at outlet of impeller - Energy per kN at inlet of impeller
  • all of the above
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