4

At the top

At the bottom

At the canter

From sides

C. At the canter

4

# Which of the following pump is generally used to pump highly viscous fluid?

Centrifugal pump

Reciprocating pump

Air lift pump

Screw pump

4

# A Pelton wheel is

Tangential flow impulse turbine

Inward flow impulse turbine

Outward flow impulse turbine

Inward flow reaction turbine

4

# Which of the following pump is successfully used for lifting water to the boilers?

Centrifugal pump

Reciprocating pump

Jet pump

Airlift pump

4

# 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

4

175.4 r.p.m.

215.5 r.p.m.

241.5 r.p.m.

275.4 r.p.m

4

4

# Motion of a liquid in a volute casing of a centrifugal pump is an example of

Rotational flow

Forced spiral vortex flow

Spiral vortex flow

4

# Multistage centrifugal pumps are used to

Give high discharge

Pump viscous fluids

All of these

4

waV/2g × sinθ

waV/g × sinθ

waV²/2g × sin2θ

waV²/g × sinθ

4

L.A.N

2 L.A.N

(L.A.N)/60

(2 L.A.N)/60

4

# The jet ratio is defined as the ratio of the

Diameter of jet to the diameter of Pelton wheel

Velocity of jet to the velocity of Pelton wheel

Diameter of Pelton wheel to the diameter of jet

Velocity of Pelton wheel to the velocity of jet

4

Centrifugal

Axial flow

Reciprocating

Mixed flow

4

0.25 kW

0.75 kW

1.75 kW

3.75 kW

4

# The function of guide vanes in a reaction turbine is to

Allow the water to enter the runner without shock

Allow the water to flow over them, without forming eddies

Allow the required quantity of water to enter the turbine

All of the above

4

39.2 %

48.8 %

84.8 %

88.4 %

4

# Guide angle as per the aerofoil theory of Kaplan turbine blade design is defined as the angle between

Lift and resultant force

Drag and resultant force

Lift and tangential force

Lift and drag

4

# According to fan laws, at constant pressure, the speed capacity and power vary

Directly as the air or gas density

Inversely as square root of density

Inversely as density

As square of density

4

# 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

4

# The flow rate in gear pump

Increases with increase in pressure

Decreases with increase in pressure

More or less remains constant with increase in pressure

Unpredictable

4

ηh = ηo × ηm

ηm = ηm × ηh

ηo = ηh × ηm

None of these

4

# Which place in hydraulic turbine is most susceptible for cavitations?

Inlet of draft rube

Penstock

4

# According to fan laws, at constant weight of air or gas, the speed, capacity and pressure vary

Directly as the air or gas density

Inversely as square root of density

Inversely as density

As square of density

4

# 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

4

# 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

4

# When a piping system is made up primarily of vertical lift and very little pipe friction, the pump characteristics should be

Horizontal

Nearly horizontal

Steep

First rise and then fall

4

10° to 15°

15° to 20°

20° to 25°

25° to 30°

4

# According to fan laws, for fans having constant wheel diameter, the air or gas capacity varies

Directly as fan speed

Square of fan speed

Cube of fan speed

Square root of fan speed

4

# A ship with jet propulsion draws water through inlet orifices at right angles to the direction of its motion. The propelling force of the jet is (where a = Area of the jet, Vr = Relative velocity of the jet and ship = V + v, v = Velocity of the ship, and V = Velocity of the jet issuing from the ship)

waVr /g × (Vr + v)

waVr /g × (Vr - v)

waVr /g × (Vr + v)²

waVr /g × (Vr - v)²

4

# Low specific speed of turbine implies it is

Propeller turbine

Francis turbine

Impulse turbine

Any one of the above