Hydraulic Machines MCQs

Welcome to our comprehensive collection of Multiple Choice Questions (MCQs) on Hydraulic Machines, a fundamental topic in the field of Mechanical Engineering. Whether you're preparing for competitive exams, honing your problem-solving skills, or simply looking to enhance your abilities in this field, our Hydraulic Machines MCQs are designed to help you grasp the core concepts and excel in solving problems.

In this section, you'll find a wide range of Hydraulic Machines mcq questions that explore various aspects of Hydraulic Machines problems. Each MCQ is crafted to challenge your understanding of Hydraulic Machines principles, enabling you to refine your problem-solving techniques. Whether you're a student aiming to ace Mechanical Engineering tests, a job seeker preparing for interviews, or someone simply interested in sharpening their skills, our Hydraulic Machines MCQs are your pathway to success in mastering this essential Mechanical Engineering topic.

Note: Each of the following question comes with multiple answer choices. Select the most appropriate option and test your understanding of Hydraulic Machines. You can click on an option to test your knowledge before viewing the solution for a MCQ. Happy learning!

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Hydraulic Machines MCQs | Page 10 of 17

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Q91.
A Pelton wheel develops 1750 kW under a head of 100 metres while running at 200 r.p.m. and discharging 2500 litres of water per second. The unit speed of the wheel is

a.

10 r.p.m.

b.

20 r.p.m.

c.

40 r.p.m.

d.

80 r.p.m.

Discuss
Answer: (b).20 r.p.m.
Q92.
The hydraulic efficiency of an impulse turbine is maximum when velocity of wheel is __________ of the jet velocity,

a.

one-fourth

b.

one-half

c.

three-fourth

d.

double

Discuss
Answer: (b).one-half
Q93.
The specific speed of a hydraulic turbine depends upon

a.

speed and power developed

b.

discharge and power developed

c.

speed and head of water

d.

speed, power developed and head of water

Discuss
Answer: (d).speed, power developed and head of water
Q94.
Dynamic similarity is said to exist between the model and the prototype, if both of them

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

Discuss
Answer: (d).none of the above
Q95.
The specific speed of a turbine is given by the equation

a.

N√P / H^3/2

b.

N√P / H²

c.

N√P / H^5/4

d.

N√P / H³

Discuss
Answer: (c).N√P / H^5/4
Q96.
A draft tube is used with impulse turbines.

a.

Yes

b.

No

c.

Can't say

d.

None of these

Discuss
Answer: (b).No
Q97.
A hydraulic ram is a device used to

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

Discuss
Answer: (d).to lift small quantity of water to a greater height when a large quantity of water is available at a smaller height
Q98.
Overall efficiency of a centrifugal pump is the ratio of

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

Discuss
Answer: (b).actual workdone by the pump to the energy supplied to the pump by the prime mover
Q99.
The function of guide vanes in a reaction turbine is to

a.

allow the water to enter the runner without shock

b.

allow the water to flow over them, without forming eddies

c.

allow the required quantity of water to enter the turbine

d.

all of the above

Discuss
Answer: (d).all of the above
Q100.
Which of the following statement is correct ?

a.

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

b.

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

c.

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

d.

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

Discuss
Answer: (c).In an impulse turbine, the pressure of the flowing water remains unchanged and is equal to atmospheric pressure.
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