Hydraulic Machines MCQ Multiple Choice Questions Answers | Quiz for Practice

Q: 1. Maximum impulse will be developed in hydraulic ram when

Correct Answer is: waste valve closes suddenly

Q: 2. A hydraulic accumulator normally consists of

Correct Answer is: a cylinder and a ram

Q: 3. A hydraulic intensifier normally consists of

Correct Answer is: two co-axial rams and two cylinders

Q: 4. In reaction turbine, draft tube is used

Correct Answer is: to convert the kinetic energy to flow energy by a gradual expansion of the flow cross-section

Q: 5. The efficiency of a centrifugal pump is maximum when its blades are

Correct Answer is: bent backward

Q: 6. In centrifugal pumps, maximum efficiency is obtained when the blades are

Correct Answer is: bent backward

Q: 7. Motion of a liquid in a volute casing of a centrifugal pump is an example of

Correct Answer is: spiral vortex flow.

Q: 8. Air vessels in reciprocating pump are used to

Correct Answer is: reduce acceleration to minimum

Q: 9. 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

Correct Answer is: same quantity of liquid

Q: 11. In a reciprocating pump, air vessels are used to

Correct Answer is: Reduce the acceleration head

Hydraulic Machines Multiple Choice Questions (MCQs) are essential practice tools for students and exam aspirants. These questions cover key concepts and help reinforce understanding of hydraulic systems and their applications.

About Hydraulic Machines MCQ Questions

Hydraulic Machines MCQs are designed to test your knowledge of fluid mechanics, pump and turbine operations, and the principles of hydraulic systems. Key concepts include Bernoulli's theorem, energy conversion, and the performance characteristics of various hydraulic machines.

Why Practice Hydraulic Machines Objective Questions?

Practicing Hydraulic Machines MCQs offers several benefits. They help you prepare for school and college exams, enhance your understanding of complex concepts, and improve your performance in competitive exams and job interviews. Regular practice ensures you are well-prepared and confident in your knowledge of hydraulic systems.

Who Should Use These MCQs?

Students preparing for school or college exams
Competitive exam aspirants
Candidates preparing for interviews

Hydraulic Machines MCQ Questions for Practice

1. Maximum impulse will be developed in hydraulic ram when

supply pipe is short
ram chamber is large
waste valve closes suddenly
supply pipe is long

2. A hydraulic accumulator normally consists of

two co-axial rams and two cylinders
a cylinder, a piston, storage tank and control valve
two cylinders, two rams and a storage device
a cylinder and a ram

3. A hydraulic intensifier normally consists of

two co-axial rams and two cylinders
a cylinder, a piston, storage tank and control valve
two cylinders, two rams and a storage device
a cylinder and a ram

4. In reaction turbine, draft tube is used

for safety of turbine
to increase flow rate
to transport water downstream without eddies
to convert the kinetic energy to flow energy by a gradual expansion of the flow cross-section

5. The efficiency of a centrifugal pump is maximum when its blades are

bent backward
bent forward first and then backward
straight
bent forward

6. In centrifugal pumps, maximum efficiency is obtained when the blades are

bent backward
radial
straight
bent forward

7. Motion of a liquid in a volute casing of a centrifugal pump is an example of

forced spiral vortex flow
forced cylindrical vortex flow
spiral vortex flow.
radial

8. Air vessels in reciprocating pump are used to

increase pump efficiency
save pump from cavitation
smoothen flow
reduce acceleration to minimum

9. 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

Q/0.75
1.5 Q
same quantity of liquid
0.75 Q

10. The horse power required in above case will be

B.H.P./0.75
1.5 B.H.P.
same
0.75 B.H.P.

11. In a reciprocating pump, air vessels are used to

Smoothen the flow
Reduce the acceleration head
Reduce the flow
Increase the delivery head

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

free vortex motion
forced vortex
rectilinear flow
radial flow

13. Pressure intensifier increases the pressure in proportion to

inverse ratio of diameters
square of inverse ratio of diameters
ratio of diameters
square of ratio of diameters

14. In axial flow fans and turbines, fluid enters and leaves as follows

axially, axially
radially, radially
radially, axially
axially, radially

15. In a centrifugal pump casing, the flow of water leaving the

centrifugal
vortex
radial
radial

16. Low specific speed of turbine implies it is

impulse turbine
any one of the above
propeller turbine
Francis turbine

17. Medium specific speea of turbine implies it is

impulse turbine
any one of the above
propeller turbine
Francis turbine

18. High specific speed of turbine implies it is

impulse turbine
any one of the above
propeller turbine
Francis turbine

19. The specific speed of turbine is defined as the speed of a unit

of such a size that it requires unit power per unit head
of such a size that it produces unit horse power with unit head
of such a size that it delivers unit dis-charge at unit head
of such a size that it delivers unit dis-charge at unit power

20. Any change in load is adjusted by adjusting following parameter on turbine

blade velocity
flow
net head
absolute velocity

21. Francis turbine is best suited for

high head installation above 180 m
all types of heads
medium head application from 24 to 180 m
low head installation up to 30 m

22. An impulse turbine is used for

Medium head of water
High discharge
Low head of water
High head of water

23. Reaction turbines are used for

high head and low discharge
low head and high discharge
low head
high head

24. Guide angle as per the aerofoil theory of Kaplan turbine blade design is defined as the angle between

lift and tangential force
lift and drag
lift and resultant force
drag and resultant force

25. A turbine is a device which converts

Hydraulic energy into mechanical energy
None of the above.
Kinetic energy in to mechanical energy
Mechanical energy in to hydraulic energy

26. Centrifugal pump is started with its delivery valve

irrespective of any position
kept 50% open
kept fully closed
kept fully open

27. Axial flow pump is started with its delivery valve

irrespective of any position
kept 50% open
kept fully closed
kept fully open

28. A centrifugal pump is superior to a reciprocating pump because

It gives smooth flow
All the above
It is a high speed pump
It is more economical

29. Which place in hydraulic turbine is most susceptible for cavitation

guide blade
penstock
inlet of draft rube
blade inlet

30. The flow rate in gear pump

more or less remains constant with in-crease in pressure
unpredictable
increases with increase in pressure
decreases with increase in pressure