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Hydraulic Machines Online Exam Quiz

Important questions about Hydraulic Machines. Hydraulic Machines MCQ questions with answers. Hydraulic Machines exam questions and answers for students and interviews.

1. A hydraulic ram is a device used to

Options

A : store the energy of water

B : increase the pressure of water

C : to lift water from deep wells

D : to lift small quantity of water to a greater height when a large quantity of water is available at a smaller height

2. A Kaplan turbine is an axial flow reaction turbine.

Options

A : Correct

B : Incorrect

C :

D :

3. In a mixed flow centrifugal pump, the flow through the impeller is a combination of radial and axial flows.

Options

A : Correct

B : Incorrect

C :

D :

4. The cavitation in reaction turbines is avoided, to a great extent by

Options

A : installing the turbine below the tail race level

B : using stainless steel runner of the turbine

C : providing highly polished blades to the runner

D : all of the above

5. Dynamic similarity is said to exist between the model and the prototype, if both of them

Options

A : have identical velocities

B : are equal in size and shape

C : are identical in shape, but differ only in size

D : none of the above

6. If the ratio's of the corresponding forces acting at corresponding points are equal, then the model and the prototype are said to have.

Options

A : geometric similarity

B : kinematic similarity

C : dynamic similarity

D : none of these

7. If the Francis turbine is run below 50 percent head for a long period, it will not only lose its efficiency but also the cavitation danger will become more serious.

Options

A : Agree

B : Disagree

C :

D :

9. The hydraulic efficiency of an impulse turbine is maximum when velocity of wheel is __________ of the jet velocity,

Options

A : one-fourth

B : one-half

C : three-fourth

D : double

10. A hydraulic intensifier is a device used to increase the intensity of pressure of water by means of energy available from a large quantity of water at a low pressure.

Options

A : Correct

B : Incorrect

C :

D :

1. Which of the following statement is correct as regard to water wheels?

Options

A : They have slow speeds.

B : They are suitable even for low water heads.

C : They give constant efficiency, even if the discharge is not constant

D : all of the above

2. The hydraulic efficiency of an impulse turbine is the

Options

A : ratio of the actual power produced by the turbine to the energy actually supplied by the turbine

B : ratio of the actual work available at the turbine to the energy imparted to the wheel

C : ratio of the work done on the wheel to the energy of the jet

D : none of the above

3. Which of the following statement is wrong?

Options

A : The reaction turbines are used for low head and high discharge.

B : The angle of taper on draft tube is less than 8°.

C : An impulse turbine is generally fitted slightly above the tail race.

D : A Francis turbine is an impulse turbine.

4. The ratio of the normal force of jet of water on a plate inclined at an angle of 30° as compared to that when the plate is normal to jet, is

Options

A : 1/ 2

B : 1/2

C : 1

D : 2

5. The efficiency of a reaction turbine for a given head __________ with the increase in speed.

Options

A : decreases

B : increases

C :

D :

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

Options

A : Centrifugal pump

B : Reciprocating pump

C : Jet pump

D : Air lift pump

7. A double overhung Pelton wheel has

Options

A : two jets

B : two runners

C : four jets

D : four runners

8. Mechanical efficiency of a centrifugal pump is the ratio of

Options

A : energy available at the impeller to the energy supplied to the pump by the prime mover

B : actual workdone by the pump to the energy supplied to the pump by the prime mover

C : energy supplied to the pump to the energy available at the impeller

D : manometric head to the energy supplied by the impeller per kN of water

10. Which of the following turbine is preferred for a specific speed of 60 to 300 r.p.m.?

Options

A : Pelton wheel

B : Francis turbine

C : Kaplan turbine

D : none of these

1. The discharge through a turbine is

Options

A : directly proportional to H 1/2

B : inversely proportional to H 1/2

C : directly proportional to H 3/2

D : inversely proportional to H 3/2

3. The Thomson's turbine is __________ reaction turbine.

Options

A : an axial flow

B : an inward flow

C : an outward flow

D : a mixed flow

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