4

N/√H

N/H

N/H3/2

N/H²

A. N/√H

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

Q = π.D.Vf

Q = π.b.Vf

Q = π.D.bf.V

Q = D.b.Vf

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

# 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

# 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

Potential Energy

Strain Energy

Kinetic energy

None of these

4

Normal speed

Unit speed

Specific speed

None of these

4

0.25 m3/s

0.5 m3/s

1.5 m3/s

2.5 m3/s

4

# Multistage centrifugal pumps are used to obtain

High discharge

Pumping of viscous fluids

4

# Puck up the wrong statement about centrifugal pump

Discharge a diameter

Power a speed⁴

4

Axially, axially

4

# The undershot water wheels are those in which

The wheel runs entirely by the weight of water

The wheel runs entirely by the impulse of water

The wheel runs partly by the weight of water and partly by the impulse of water

None of the above

4

Double

Three times

Four times

Five times

4

Centrifugal

Axial flow

Mixed flow

Reciprocating

4

# Which of the following is not a reaction turbine?

Fourneyron turbine

Journal turbine

Thomson's turbine

Pelton wheel

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

At the top

At the bottom

At the canter

From sides

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

# Medium specific speed of turbine implies it is

Propeller turbine

Francis turbine

Impulse turbine

Any one of the above

4

ηh = ηo × ηm

ηm = ηm × ηh

ηo = ηh × ηm

None of these

4

(W/p) × (A/a)

(p/W) × (a/A)

(W/p) × (a/A)

(p/W) × (A/a)

4

One-fourth

One-half

Three-fourth

Double

4

Centrifugal

Axial flow

Reciprocating

Mixed flow

4

Strain

Pressure

Kinetic

None of these

4

Sum

Difference

Product

None of these

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

# Head developed by a centrifugal pump depends on

Impeller diameter

Speed

Fluid density

Both (A) and (B) above

4

Product

Difference

Sum

None of these

4

# The hydraulic efficiency of an impulse turbine is the

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