4

39.2 %

48.8 %

84.8 %

88.4 %

C. 84.8 %

4

High discharge

4

# Indicator diagram of a reciprocating pump is a graph between

Flow vs. swept volume

Pressure in cylinder vs. swept volume

Flow vs. speed

Pressure vs. speed

4

# Dynamic 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

None of the above

4

# The flow ratio of Francis turbine is defined as the ratio of the

Velocity of flow at inlet to the theoretical jet velocity

Theoretical velocity of jet to the velocity of flow at inlet

Velocity of runner at inlet to the velocity of flow at inlet

None of the above

4

# In reaction turbine, draft tube is used

To transport water downstream without eddies

To convert the kinetic energy to flow energy by a gradual expansion of the flow cross-section

For safety of turbine

To increase flow rate

4

# Impulse turbine is generally fitted

At the level of tail race

Little above the tail race

Slightly below the tail race

About 2.5 m above the tail race to avoid cavitations.

4

# The efficiency of jet propulsion for a ship with inlet orifices at right angles to the direction of motion of ship is given by

[2(Vr - v) v]/ Vr²

2(Vr + v) v]/ Vr²

[(Vr - v) v]/ Vr

[(Vr + v) v]/ Vr

4

# Power required (in watts) to drive a centrifugal pump is (where Hm = Manometric head in metres, w = Specific weight in N/m3, Q = Discharge of the pump in m3/s, and ηo = Overall efficiency of the pump)

(w Hm) / (Q × ηo)

(w Hm Q) / ηo

(w Q) / (Hm × ηo)

(w Q ηo) / Hm

4

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

Inlet of draft rube

Penstock

4

# 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

waV/2g × sinθ

waV/g × sinθ

waV²/2g × sin2θ

waV²/g × sinθ

4

Absolute velocity

Flow

4

# The hydraulic 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 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

At the top

At the bottom

At the canter

From sides

4

One-fourth

One-half

Three-fourth

Double

4

# The working of which of the following hydraulic units is based on Pascal's law?

Air lift pump

Jet pump

Hydraulic coupling

Hydraulic press

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

4

# Which of the following statement is correct?

In an impulse turbine, the water impinges on the buckets with pressure energy.

In a reaction turbine, the water glides over the moving vanes with kinetic energy.

In an impulse turbine, the pressure of the flowing water remains unchanged and is equal to atmospheric pressure.

In a reaction turbine, the pressure of the flowing water increases after gliding over the vanes.

4

# Casting of a centrifugal pump is designed so as to minimize

Friction loss

Cavitations

Loss of kinetic energy

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

# 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

# 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

# Head developed by a centrifugal pump depends on

Impeller diameter

Speed

Fluid density

Both (A) and (B) above

4

# A hydraulic coupling belongs to the category of

Power absorbing machines

Power developing machines

Energy transfer machines

Energy generating machines

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

Centrifugal

Axial flow

Reciprocating

Mixed flow

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

# Which of the following hydraulic unit is used for transmitting increased or decreased torque to the driven shaft?

Hydraulic ram

Hydraulic intensifier

Hydraulic torque converter

Hydraulic accumulator

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

# Overall efficiency of a centrifugal pump is the ratio of

Energy available at the impeller to the energy supplied to the pump by the prime mover

Actual workdone by the pump to the energy supplied to the pump by the prime mover

Energy supplied to the pump to the energy available at the impeller

Manometric head to the energy supplied by the impeller per kN of water