4

102 watts

75 watts

550 watts

735 watts

D. 735 watts

4

# For starting an axial flow pump, its delivery valve should be

Closed

Open

Depends on starting condition and flow desired

Could be either open or closed

4

Volute casing

Vortex casing

Any one of these

4

39.2 %

48.8 %

84.8 %

88.4 %

4

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

Centrifugal pump

Reciprocating pump

Air lift pump

Screw pump

4

# The speed of a turbine runner is

Directly proportional to H1/2

Inversely proportional to H1/2

Directly proportional to H3/2

Inversely proportional to H3/2

4

Axial

Centrifugal

Vortex

4

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

Directly as the air or gas density

Inversely as square root of density

Inversely as density

As square of density

4

# The type of centrifugal pump preferred for a specific speed of 20 r.p.m. is

Slow speed pump with radial flow at outlet

Medium speed pump with radial flow at outlet

High speed pump with radial flow at outlet

High speed pump with axial flow at outlet

4

# If a pump is handling water and is discharging a certain flow Q at a constant total dynamic head requiring a definite B.H.P., the same pump when handling a liquid of specific gravity 0.75 and viscosity nearly same as of water would discharge

Same quantity of liquid

0.75 Q

Q/0.75

1.5 Q

4

# Which of the following pump is successfully used for lifting water from deep wells?

Centrifugal pump

Reciprocating pump

Jet pump

Air lift pump

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

1/√2

1/2

1

√2

4

# Which of the following is not a reaction turbine?

Fourneyron turbine

Journal turbine

Thomson's turbine

Pelton wheel

4

# Medium specific speed of turbine implies it is

Propeller turbine

Francis turbine

Impulse turbine

Any one of the above

4

# 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

4

# In a single casing, multistage pump running at constant speed, the capacity rating is to be slightly lowered. It can be done by

Designing new impeller

Trimming the impeller size to the required size by machining

Not possible

Some other alterations in the impeller

4

0 to 4.5

10 to 100

80 to 200

250 to 300

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

# The runaway speed of a hydraulic turbine is the speed

At which there will be no damage to the runner

At which the turbine will run freely without load

4

N√P / H3/2

N√P / H²

N√P / H5/4

N√P / H3

4

# A Pelton wheel is

Tangential flow impulse turbine

Inward flow impulse turbine

Outward flow impulse turbine

Inward flow reaction turbine

4

# Discharge of a centrifugal pump is (where N = Speed of the pump impeller)

Directly proportional to N

Inversely proportional to N

Directly proportional to N²

Inversely proportional to N²

4

# Which of the following pump is preferred for flood control and irrigation applications?

Centrifugal pump

Axial flow pump

Mixed flow pump

Reciprocating pump

4

# Head developed by a centrifugal pump is

Proportional to diameter of impeller

Proportional to speed of impeller

Proportional to diameter and speed of impeller

None of the above

4

# 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

4

Equal to

1.2 times

1.8 times

Double

4

# 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

4

# Slip of a reciprocating pump is defined as the

Ratio of actual discharge to the theoretical discharge

Sum of actual discharge and the theoretical discharge

Difference of theoretical discharge and the actual discharge

Product of theoretical discharge and the actual discharge

4

(N√Q)/H2/3

(N√Q)/H3/4

(N√Q)/H

(N√Q)/H5/4