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Hydraulic Machines
Quiz 7
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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
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