Q.1

The overall efficiency of a reaction turbine is the ratio of

  • power produced by the turbine to the energy actually supplied by the turbine
  • actual work available at the turbine to the energy imparted to the wheel
  • workdone on the wheel to the energy (or head of water) actually supplied to the turbine
  • none of the above
Q.2

The breast water wheels are those in which the wheel runs partly by the weight of water and partly by the impulse of water.

  • True
  • False
Q.3

The power produced by the reaction turbine is __________ to the head of water.

  • directly proportional
  • inversely proportional
Q.4

Theoretical power required (in watts) to drive a reciprocating pump is (where w = Specific weight of liquid to be pumped in N/m3, Q = Discharge of the pump in m3/s, Hs = Suction head in metres, and Hd = Delivery head in metres)

  • wQHs
  • wQHd
  • wQ(Hs - Hd)
  • wQ(Hs + Hd)
Q.5

A centrifugal pump will start delivering liquid only when the pressure rise in the impeller is equal to the

  • kinetic head
  • velocity head
  • manometric head
  • static head
Q.6

The principle of jet propulsion is used in driving the ships and aeroplanes.

  • Correct
  • Incorrect
Q.7

The ratio of actual work available at the turbine to the energy imparted to the wheel is known as __________ efficiency.

  • hydraulic
  • mechanical
  • overall
Q.8

Work done by a turbine __________ upon the weight of water flowing per second.

  • depends
  • does not depend
Q.9

The ratio of quantity of liquid discharged per second from the pump to the quantity of liquid passing per second through the impeller is known as

  • manometric efficiency
  • mechanical efficiency
  • overall efficiency
  • volumetric efficiency
Q.10

When the speed of the pump increases, its net positive suction head (NPSH) requirement decreases.

  • Agree
  • Disagree
Q.11

In the casing of a centrifugal pump, the kinetic energy of the water is converted into pressure energy before the water leaves the casing.

  • True
  • False
Q.12

Geometric 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.13

The force exerted by a jet of water (in a direction normal to flow) impinging on a fixed plate inclined at an angle θ with the jet is

Q.14

Power required to drive a centrifugal pump is directly proportional to __________ of its impeller.

  • diameter
  • square of diameter
  • cube of diameter
  • fourth power of diameter
Q.15

The mechanical efficiency of an impulse turbine is

  • ratio of the actual power produced by the turbine to the energy actually supplied by the turbine
  • ratio of the actual work available at the turbine to the energy imparted to the wheel
  • ratio of the Work done on the wheel to the energy of the jet
  • none of the above
Q.16

The overshot water wheels are those in which the wheel runs entirely by the __________ of water.

  • weight
  • impulse
Q.17

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

  • 2 to 4
  • 4 to 8
  • 8 to l6
  • 16 to 24
Q.18

If Hg is the gross or total head and hf is the head lost due to friction, then net or effective head (H) is given by

  • H = Hg/hf
  • H = Hg x hf
  • H = Hg + hf
  • H = Hg - hf
Q.19
The force present in a moving liquid is
  • Inertia force
  • Viscous force
  • Gravity force
  • All of these
Q.20
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.21
A flow in which each liquid particle has a definite path, and the paths of individual particles do not cross each other, is called
  • Steady flow
  • Uniform flow
  • Streamline flow
  • Turbulent flow
Q.22
The working of which of the following hydraulic units is based on Pascal's law?
  • Air lift pump
  • Jet pump
  • Hydraulic coupling
  • Hydraulic press
Q.23
The angle of taper on draft tube is
  • Greater than 15°
  • Greater than 8°
  • Greater than 5°
  • Less than 8°
Q.24
A glass tube of smaller diameter is used while performing an experiment for the capillary rise of water because
  • It is easier to see through the glass tube
  • Glass tube is cheaper than a metallic tube
  • It is not possible to conduct this experiment with any other tube
  • All of the above
Q.25
The torque required to overcome viscous resistance of a footstep bearing is (where μ = Viscosity of the oil, N = Speed of the shaft, R = Radius of the shaft, and t = Thickness of the oil film)
  • μπ²NR/60t
  • μπ²NR²/60t
  • μπ²NR³/60t
  • μπ²NR⁴/60t
Q.26
When a liquid is flowing through a pipe, the velocity of the liquid is
  • Maximum at the centre and minimum near the walls
  • Minimum at the centre and maximum near the walls
  • Zero at the centre and maximum near the walls
  • Maximum at the centre and zero near the walls
Q.27
According to Newton's law of viscosity, the shear stress on a layer of a fluid is __________ to the rate of shear strain.
  • Equal to
  • Directly proportional
  • Inversely proportional
  • None of these
Q.28
Which of the following is an example of laminar flow?
  • Underground flow
  • Flow past tiny bodies
  • Flow of oil in measuring instruments
  • All of these
Q.29
Which of the following instrument can be used for measuring speed of an aeroplane?
  • Venturimeter
  • Orifice plate
  • Pitot tube
  • Rotameter
Q.30
The discharge of a depressed nappe is 6 to 7 percent __________ that of a free nappe.
  • Less than
  • More than
  • Equal to
  • None of these
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