Q.1
The flow in a pipe or channel is said to be non-uniform when
  • The liquid particles at all sections have the same velocities
  • The liquid particles at different sections have different velocities
  • The quantity of liquid flowing per second is constant
  • Each liquid particle has a definite path
Q.2
The product of mass and acceleration of flowing liquid is called
  • Inertia force
  • Viscous force
  • Gravity force
  • Pressure force
Q.3
The property by virtue of which a liquid opposes relative motion between its different layers is called
  • Surface tension
  • Coefficient of viscosity
  • Viscosity
  • Osmosis
Q.4
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.5
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.6
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.7
The capacity of a hydraulic accumulator is generally specified as the maximum amount of energy stored.
  • True
  • False
Q.8
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.9
A large Reynold number is indication of
  • Smooth and streamline flow
  • Laminar flow
  • Steady flow
  • Highly turbulent flow
Q.10
The capillary rise at 20°C in a clean glass tube of 1 mm bore containing water is approximately
  • 5 mm
  • 10 mm
  • 20 mm
  • 30 mm
Q.11
Motion of a liquid in a volute casing of a centrifugal pump is an example of
  • Rotational flow
  • Radial
  • Forced spiral vortex flow
  • Spiral vortex flow
Q.12
The flow of water through the hole in the bottom of a wash basin is an example of
  • Steady flow
  • Uniform flow
  • Free vortex
  • Forced vortex
Q.13
A hydraulic press is a device used
  • To store pressure energy which may be supplied to a machine later on
  • To increase the intensity of pressure of water by means of energy available from a large quantity of water at a low pressure
  • To lift larger load by the application of a comparatively much smaller force
  • All of the above
Q.14
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
  • ρaV2×sinθ
  • ρaV/2×sinθ
  • ρaV2/2×sin2θ
  • ρaV×sinθ
Q.15
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
Q.16
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.17
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.18
Froude's number is the ratio of inertia force to
  • Pressure force
  • Elastic force
  • Gravity force
  • Surface tension force
Q.19
Reynold's number is the ratio of inertia force to
  • Pressure force
  • Elastic force
  • Gravity force
  • Viscous force
Q.20
The unit of dynamic viscosity in S.I. units is
  • N-m/s²
  • N-s/m²
  • Poise
  • Stoke
Q.21
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.22
The principle of jet propulsion is used in driving the ships and aeroplanes.
  • Correct
  • Incorrect
Q.23
A hydraulic coupling belongs to the category of
  • power absorbing machines
  • power developing machines
  • energy transfer machines
  • energy generating machines
Q.24
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.25
Pressure intensifier increases the pressure in proportion to
  • Ratio of diameters
  • Square of ratio of diameters
  • Inverse ratio of diameters
  • Square of inverse ratio of diameters
Q.26
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.27
A tank of uniform cross-sectional area (A) containing liquid upto height (Hhas an orifice of cross-sectional area (a) at its bottom. The time required to bring the liquid level from H1 to H2 will be
  • 2A × √H₁/Cd × a × √(2g)
  • 2A × √H₂/Cd × a × √(2g)
  • 2A × (√H₁ - √H₂)/Cd × a × √(2g)
  • 2A × (√H3/2 - √H3/2)/Cd × a × √(2g)
Q.28
When the speed of the pump increases, its net positive suction head (NPSH) requirement decreases.
  • Agree
  • Disagree
Q.29
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.30
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.Vf
  • Q = π.b.Vf
  • Q = π.b.Vf
  • Q = b.Vf
0 h : 0 m : 1 s