MCQOPTIONS
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MCQOPTIONS
This section includes 32 Mcqs, each offering curated multiple-choice questions to sharpen your Hydraulics Machines knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Which of the following pump is sucessfully used for lifting water to the turbines? |
| A. | Centrifugal pump |
| B. | Reciprocating pump |
| C. | Jet pump |
| D. | Air-lift pump |
| Answer» D. Air-lift pump | |
| 2. |
Which type of the pump is defferent from others in the same group? |
| A. | Screw pump |
| B. | Gear pump |
| C. | Cam and piston pump |
| D. | Plunger pump |
| Answer» E. | |
| 3. |
A reciprocating pump is also called a |
| A. | positive |
| B. | negative |
| Answer» B. negative | |
| 4. |
The Furneyron turbine is |
| A. | an axial flow |
| B. | an inward flow |
| C. | an outward flow |
| D. | a mixed flow |
| Answer» D. a mixed flow | |
| 5. |
In a Francis turbine, the pressure at inlet is |
| A. | less than |
| B. | more than |
| Answer» C. | |
| 6. |
The discharge through a reaction turbine |
| A. | remains same |
| B. | increases |
| C. | decreases |
| Answer» D. | |
| 7. |
The power produced by the reaction turbine is |
| A. | directly proportional |
| B. | inversely proportional |
| Answer» B. inversely proportional | |
| 8. |
A hydraulic accumulator is a device used to store |
| A. | strain |
| B. | pressure |
| C. | kinetic |
| Answer» C. kinetic | |
| 9. |
In the above question, 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. |
| Answer» C. 40 r.p.m. | |
| 10. |
In the above question, the saving in case of a double acting reciprocating pump is |
| A. | 39.20% |
| B. | 48.80% |
| C. | 84.80% |
| D. | 88.40% |
| Answer» B. 48.80% | |
| 11. |
Work done by a turbine |
| A. | depends |
| B. | does not depend |
| Answer» B. does not depend | |
| 12. |
The hydraulic efficiency of an impulse turbine is maximum when velocity of wheel is |
| A. | one-fourth |
| B. | one-half |
| C. | three-fourth |
| D. | double |
| Answer» C. three-fourth | |
| 13. |
The static head of a centrifugal pump is equal to the |
| A. | product |
| B. | difference |
| C. | sum |
| Answer» D. | |
| 14. |
For 450 m head of water, |
| A. | Pelton wheel |
| B. | Kaplan turbine |
| C. | Francis turbine |
| D. | none of these |
| Answer» B. Kaplan turbine | |
| 15. |
The Thomson's turbine is |
| A. | an axial flow |
| B. | an inward flow |
| C. | an outward flow |
| D. | a mixed flow |
| Answer» D. a mixed flow | |
| 16. |
The width of the bucket for a Pelton wheel is generally |
| A. | double |
| B. | three times |
| C. | four times |
| D. | five times |
| Answer» E. | |
| 17. |
In an axial flow reaction turbine, the water flows |
| A. | parallel |
| B. | perpendicular |
| Answer» B. perpendicular | |
| 18. |
The depth of the bucket for a Pelton wheel is generally |
| A. | equal to |
| B. | 1.2 times |
| C. | 1.8 times |
| D. | double |
| Answer» C. 1.8 times | |
| 19. |
The overshot water wheels are those in which the wheel runs entirely by the |
| A. | weight |
| B. | impulse |
| Answer» B. impulse | |
| 20. |
Manometric head is the actual head of water against which a centrifugal pump has to work |
| A. | Right |
| B. | Wrong |
| Answer» B. Wrong | |
| 21. |
In a reciprocating pump, air vessels are fitted to the suction pipe and deliver pipe close to the cylinder of the pump. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 22. |
Power required to drive a centrifugal pump is directly proportional to |
| A. | diameter |
| B. | square of diameter |
| C. | cube of diameter |
| D. | fourth power of diameter |
| Answer» E. | |
| 23. |
In a centrifugal pump, the water enters the impeller |
| A. | axially |
| B. | radially |
| Answer» C. | |
| 24. |
Which of the following pump is sucessfully used for lifting water to the wells? |
| A. | Centrifugal pump |
| B. | Reciprocating pump |
| C. | Jet pump |
| D. | Air-lift pump |
| Answer» E. | |
| 25. |
Which of the following trubine is preferred for 0 to 25 m head of water? |
| A. | Pelton wheel |
| B. | Kaplan turbine |
| C. | Francis turbine |
| D. | none of these |
| Answer» C. Francis turbine | |
| 26. |
A jet of water is striking at the centre of a curved vane moving with a uniform velocity in the direction of jet. For the maximum efficiency, the vane velocity is |
| A. | one-half |
| B. | one-third |
| C. | two-third |
| D. | three-fourth |
| Answer» C. two-third | |
| 27. |
The speed of an imaginary turbine, identical with the fiven turbine, which will develop a unit power under a unit head, is known as |
| A. | normal speed |
| B. | unit speed |
| C. | specific speed |
| D. | none of these |
| Answer» D. none of these | |
| 28. |
The capacity of a hydraulic accomulator is generally specified as the maximum amount of energy stored. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 29. |
The cavitation in ahydraulic machine |
| A. | causes noise and vibration of various parts |
| B. | reduces the discharge of a turbine |
| C. | causes sudden drop in power output and efficiency |
| D. | all of the above |
| Answer» E. | |
| 30. |
The efficiency of a Pelton wheel working under constant head |
| A. | remains same |
| B. | increases |
| C. | decreases |
| Answer» C. decreases | |
| 31. |
The efficiency of a reaction turbine for a given head |
| A. | decreases |
| B. | increases |
| Answer» B. increases | |
| 32. |
The gross or total head of the turbine is the |
| A. | sum |
| B. | difference |
| C. | product |
| Answer» C. product | |