R4RIN – MCQs, Mock Tests | Civil Engineering Hydraulic Machines MCQ

Hydraulic ram is a device used to

1. Increase the pressure of a liquid
2. Lift small quantity of water to greater heights
3. Lift larger loads by applying smaller force
4. none of the above

✅ Correct Answer: 2

Reciprocating pump is suited for

1. Low discharge and high head
2. High discharge and low head
3. Low discharge and low head
4. High discharge and high head

✅ Correct Answer: 1

The difference of head as shown by manometers connected between the inlet and outlet flanges of the pump is known as

1. Static head
2. Total head
3. Dynamic head
4. Manometric head

✅ Correct Answer: 4

Centrifugal pump is a _____ type of pump.

1. Axial flow
2. Radial flow
3. Mixed flow
4. None of the above

✅ Correct Answer: 2

Unit discharge is a discharge through a turbine when it is working under

1. Unit head
2. Unit head and discharging one cubic metre of water
3. Unit head and developing unit power
4. None of the above

✅ Correct Answer: 1

A Pelton wheel is a _____ impulse turbine

1. Axial flow
2. Inward flow
3. Outward flow
4. Tangential flow

✅ Correct Answer: 4

For a semicircular vane when its velocity is half the jet velocity, efficiency is

1. 50%
2. 70%
3. 100%
4. 120%

✅ Correct Answer: 3

In reaction turbines, total inlet energy is

1. Pressure energy only
2. Kinetic energy
3. Both a and b
4. None of these

✅ Correct Answer: 3

The cavitation in a turbine is mainly due to

1. Low velocity
2. High velocity
3. High pressure
4. Low pressure

✅ Correct Answer: 4

The cavitation in a turbine is mainly due to

1. Low velocity
2. High velocity
3. High pressure
4. Low pressure

✅ Correct Answer: 4

Air vessel is provided to reciprocating pump near its

1. Suction pipe
2. Delivery pipe
3. Neither at suction nor at delivery pipes
4. Both at suction and delivery pipes

✅ Correct Answer: 4

The flow is called rotational if its velocity normal to the plane of area is equal to

1. angular velocity vector
2. thrice the angular velocity vector
3. twice the angular velocity vector
4. None of these

✅ Correct Answer: 3

Cavitation

1. causes vibration of various parts of turbine and creates noise
2. reduces discharge
3. causes vibration of various parts of turbine and creates noise
4. All of the above

✅ Correct Answer: 4

A pump is a device which converts

1. mechanical energy into electrical energy
2. mechanical energy into hydraulic energy
3. hydraulic energy into mechanical energy
4. none of the above

✅ Correct Answer: 2

In a centrifugal pump casing, the flow of water leaving the impeller, is

1. forced vertex
2. free vortex motion
3. rectilinear flow
4. radial flow

✅ Correct Answer: 2

The instrument used for measuring the velocity of flow, is known as

1. pitot tube
2. Venturimeter
3. Orifice meter
4. none of these

✅ Correct Answer: 1

Hydraulic press is a device used to

1. lift larger loads by applying smaller force
2. increase the pressure of a liquid
3. lift small quantity of water to greater height
4. All of the above

✅ Correct Answer: 1

In impulsive turbine, the total energy at inlet is

1. pressure energy
2. kinetic energy
3. both kinetic and potential energy
4. none of the above

✅ Correct Answer: 2

At higher heads, the liquid which has passed through the impeller of the centrifugal pump may flow in limited quantity back to the suction side. This is known as

1. delivery head loss
2. friction loss
3. leaking loss
4. suction head loss

✅ Correct Answer: 3

Which one of the following is a impulsive turbine

1. Pelton wheel
2. Kaplan turbine
3. Francis turbine
4. None of the above

✅ Correct Answer: 1

A Francis turbine is an _____ flow reaction turbine.

1. axial
2. inward
3. outward
4. tangential

✅ Correct Answer: 3

Specific speed of a centrifugal pump is the speed at which a pump runs when

1. discharge and shaft power are unity
2. head and discharge are unity
3. head and shaft power are unity
4. none of the above

✅ Correct Answer: 2

In Pelton wheel

1. both velocity and pressure do not change
2. both velocity and pressure change
3. the velocity of jet remains same, the pressure changes
4. the velocity of jet changes, the pressure throughout remain at atmospheric

✅ Correct Answer: 4

Involute type centrifugal pump, the passage of fluid

1. remains same throughout
2. gradually increases
3. gradually decreases
4. both a and b

✅ Correct Answer: 2

In flow, the liquid particles may possess

1. pressure energy
2. potential energy
3. kinetic energy
4. all the above

✅ Correct Answer: 4

The imaginary line drawn such that the tangents at its all points indicate the direction of the velocity of the fluid particles at each point, is called

1. streak line
2. potential line
3. stream line
4. path line

✅ Correct Answer: 3

For well maintained reciprocal pumps, slip is of the order

1. 2%
2. 5%
3. 10%
4. 18%

✅ Correct Answer: 1