Q.1

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

  • 39.2%
  • 48.8%
  • 84.8%
  • 88.4%
Q.2

Dynamic similarity is said to exist between the model and the prototype, if both of them

  • have identical velocities
  • are equal in size and shape
  • are identical in shape, but differ only in size
  • none of the above
Q.3

The power developed by a turbine is (where H = Head of water under which the turbine is working)

  • directly proportional to H1/2
  • inversely proportional to H1/2
  • directly proportional to H3/2
  • inversely proportional to H3/2
Q.4

The discharge through a reaction turbine __________ with the increase in unit speed.

  • remains same
  • increases
  • decreases
Q.5

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

  • 10 r.p.m.
  • 20 r.p.m.
  • 40 r.p.m.
  • 80 r.p.m.
Q.6

The impeller of a centrifugal pump may have

  • volute casing
  • volute casing with guide blades
  • vortex casing
  • any one of these
Q.7

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
Q.8

If the Francis turbine is run belowpercent head for a long period, it will not only lose its efficiency but also the cavitation danger will become more serious.

  • Agree
  • Disagree
Q.9

Slip of a reciprocating pump is negative, when

  • suction pipe is short and pump is running at low speeds
  • delivery pipe is long and pump is running at high speeds
  • suction pipe is short and delivery pipe is long and the pump is running at low speeds
  • suction pipe is long and delivery pipe is short and the pump is running at high speeds
Q.10

In a reciprocating pump, air vessels are used to

  • smoothen the flow
  • reduce suction head
  • increase delivery head
  • reduce acceleration head
Q.11

In a mixed flow reaction turbine, the flow of water is partly radial and partly axial.

  • Correct
  • Incorrect
Q.12

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

  • double
  • three times
  • four times
  • five times
Q.13

The centrifugal pump preferred for a specific speed betweentor.p.m. 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 mixed flow at outlet
Q.14

A turbine developskW under a head ofmetres atr.p.m. Its specific speed is

  • 175.4 r.p.m.
  • 215.5 r.p.m.
  • 241.5 r.p.m.
  • 275.4 r.p.m
Q.15

The hydraulic efficiency of an impulse turbine is maximum when velocity of wheel is __________ of the jet velocity,

  • one-fourth
  • one-half
  • three-fourth
  • double
Q.16

Kinematic similarity is said to exist between the model and the prototype, if both of them

  • have identical velocities
  • are equal in size and shape
  • are identical in shape, but differ only in size
  • have identical forces
Q.17

The cavitation in reaction turbines is avoided, to a great extent by

  • installing the turbine below the tail race level
  • using stainless steel runner of the turbine
  • providing highly polished blades to the runner
  • all of the above
Q.18

The specific speed of a turbine is the speed of an imaginary turbine, identical with the given turbine, which

  • delivers unit discharge under unit head
  • delivers unit discharge under unit speed
  • develops unit power under unit head
  • develops unit power under unit speed
Q.19

Which of the following is not an impulse turbine?

  • Girad turbine
  • Turgo turbine
  • Pelton wheel
  • Kaplan turbine
Q.20

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

  • less than
  • more than
Q.21

If the ratio's of the corresponding forces acting at corresponding points are equal, then the model and the prototype are said to have.

  • geometric similarity
  • kinematic similarity
  • dynamic similarity
  • none of these
Q.22

A draft tube is used with impulse turbines.

  • Yes
  • No
Q.23

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
Q.24

A Pelton wheel with one nozzle is preferred for a specific speed betweentor.p.m.

  • True
  • False
Q.25

A draft tube is used with impulse turbines.

  • Yes
  • No
Q.26

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
Q.27

The speed 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.28

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

  • True
  • False
Q.29

The specific speed of a hydraulic turbine depends upon

  • speed and power developed
  • discharge and power developed
  • speed and head of water
  • speed, power developed and head of water
Q.30

Which type of the pump is different from others in the same group?

  • Screw pump
  • Gear pump
  • Cam and piston pump
  • Plunger pump
0 h : 0 m : 1 s