MCQOPTIONS
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MCQOPTIONS
This section includes 34 Mcqs, each offering curated multiple-choice questions to sharpen your Automobile Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
The breast water wheels are those in which the wheel runs partly by the weight of water and partly by the impulse of water. |
| A. | True |
| B. | False |
| C. | - |
| D. | - |
| Answer» B. False | |
| 2. |
The capacity of a hydraulic accumulator is generally specified as the maximum amount of energy stored. |
| A. | True |
| B. | False |
| C. | - |
| D. | - |
| Answer» B. False | |
| 3. |
In an impulse turbine, the jet of water impinges on the bucket with a low velocity and after flowing over the vanes, leaves with a high velocity. |
| A. | True |
| B. | False |
| C. | - |
| D. | - |
| Answer» C. - | |
| 4. |
In a reaction turbine, the pressure head of water, while flowing over the vanes, is converted into kinetic head before leaving the wheel. |
| A. | Agree |
| B. | Disagree |
| C. | - |
| D. | - |
| Answer» C. - | |
| 5. |
The power produced by the reaction turbine is __________ to the head of water. |
| A. | directly proportional |
| B. | inversely proportional |
| C. | - |
| D. | - |
| Answer» B. inversely proportional | |
| 6. |
The speed of an imaginary turbine, identical with the given 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 | |
| 7. |
In the casing of a centrifugal pump, the kinetic energy of the water is converted into pressure energy before the water leaves the casing. |
| A. | True |
| B. | False |
| C. | - |
| D. | - |
| Answer» B. False | |
| 8. |
The principle of jet propulsion is used in driving the ships and aeroplanes. |
| A. | Correct |
| B. | Incorrect |
| C. | - |
| D. | - |
| Answer» B. Incorrect | |
| 9. |
A hydraulic coupling belongs to the category of |
| A. | power absorbing machines |
| B. | power developing machines |
| C. | energy transfer machines |
| D. | energy generating machines |
| Answer» D. energy generating machines | |
| 10. |
A Francis turbine is used when the available head of water is |
| A. | 0 to 25 m |
| B. | 25 m to 250 m |
| C. | above 250 m |
| D. | none of these |
| Answer» C. above 250 m | |
| 11. |
When the speed of the pump increases, its net positive suction head ( NPSH ) requirement decreases. |
| A. | Agree |
| B. | Disagree |
| C. | - |
| D. | - |
| Answer» C. - | |
| 12. |
Discharge ( Q ) of a centrifugal pump is given by (where D = Diameter of impeller at inlet, b = Width of impeller at inlet, and V f = Velocity of flow at inlet) |
| A. | Q = ?. D . V f |
| B. | Q = ?. b . V f |
| C. | Q = ?. D . b . V f |
| D. | Q = D . b . V f |
| Answer» D. Q = D . b . V f | |
| 13. |
In a reciprocating pump, air vessels are fitted to the suction pipe and delivery pipe close to the cylinder of the pump. |
| A. | True |
| B. | False |
| C. | - |
| D. | - |
| Answer» B. False | |
| 14. |
The maximum number of jets, generally, employed in an impulse turbine without jet interference are |
| A. | two |
| B. | four |
| C. | six |
| D. | eight |
| Answer» D. eight | |
| 15. |
Work done by a turbine __________ upon the weight of water flowing per second. |
| A. | depends |
| B. | does not depend |
| C. | - |
| D. | - |
| Answer» B. does not depend | |
| 16. |
The overall efficiency of a reaction turbine is the ratio of |
| A. | power produced by the turbine to the energy actually supplied by the turbine |
| B. | actual work available at the turbine to the energy imparted to the wheel |
| C. | workdone on the wheel to the energy (or head of water) actually supplied to the turbine |
| D. | none of the above |
| Answer» B. actual work available at the turbine to the energy imparted to the wheel | |
| 17. |
The speed ratio of a Francis turbine is defined as the ratio of the theoretical jet velocity to the peripheral speed at inlet. |
| A. | Yes |
| B. | No |
| C. | - |
| D. | - |
| Answer» C. - | |
| 18. |
Delivery head of water of a centrifugal pump is inversely proportional to diameter of its impeller. |
| A. | Yes |
| B. | No |
| C. | - |
| D. | - |
| Answer» C. - | |
| 19. |
The discharge of a centrifugal pump working under constant head __________ with the speed. |
| A. | increases |
| B. | decreases |
| C. | - |
| D. | - |
| Answer» B. decreases | |
| 20. |
The efficiency of a Pelton wheel working under constant head __________ with the increase in power. |
| A. | remains same |
| B. | increases |
| C. | decreases |
| D. | - |
| Answer» C. decreases | |
| 21. |
Theoretical power required (in watts) to drive a reciprocating pump is (where w = Specific weight of liquid to be pumped in N/m 3 , Q = Discharge of the pump in m 3 /s, H s = Suction head in metres, and H d = Delivery head in metres) |
| A. | wQH s |
| B. | wQH d |
| C. | wQ ( H s - H d ) |
| D. | wQ ( H s + H d ) |
| Answer» E. | |
| 22. |
The specific speed of a centrifugal pump, delivering 750 litres of water per second against a head of 15 metres at 725 r.p.m., is |
| A. | 24.8 r.p.m. |
| B. | 48.2 r.p.m |
| C. | 82.4 r.p.m. |
| D. | 248 r.p.m |
| Answer» D. 248 r.p.m | |
| 23. |
Multi-stage centrifugal pumps are used to |
| A. | give high discharge |
| B. | produce high heads |
| C. | pump viscous fluids |
| D. | all of these |
| Answer» C. pump viscous fluids | |
| 24. |
The efficiency of a centrifugal pump will be maximum when the blades are bent backward. |
| A. | Yes |
| B. | No |
| C. | - |
| D. | - |
| Answer» B. No | |
| 25. |
Slip of a reciprocating pump is defined as the |
| A. | ratio of actual discharge to the theoretical discharge |
| B. | sum of actual discharge and the theoretical discharge |
| C. | difference of theoretical discharge and the actual discharge |
| D. | product of theoretical discharge and the actual discharge |
| Answer» D. product of theoretical discharge and the actual discharge | |
| 26. |
Geometric 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. | have identical forces |
| Answer» D. have identical forces | |
| 27. |
The ratio of actual work available at the turbine to the energy imparted to the wheel is known as __________ efficiency. |
| A. | hydraulic |
| B. | mechanical |
| C. | overall |
| D. | - |
| Answer» C. overall | |
| 28. |
The static head of a centrifugal pump is equal to the __________ of suction head and delivery head. |
| A. | product |
| B. | difference |
| C. | sum |
| D. | - |
| Answer» D. - | |
| 29. |
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 power of the wheel is |
| A. | 0.25 kW |
| B. | 0.75 kW |
| C. | 1.75 kW |
| D. | 3.75 kW |
| Answer» D. 3.75 kW | |
| 30. |
Discharge of a centrifugal pump is |
| A. | directly proportional to diameter of its impeller |
| B. | inversely proportional to diameter of its impeller |
| C. | directly proportional to (diameter) 2 of its impeller |
| D. | inversely proportional to (diameter) 2 of its impeller |
| Answer» D. inversely proportional to (diameter) 2 of its impeller | |
| 31. |
If H g is the gross or total head and h f is the head lost due to friction, then net or effective head ( H ) is given by |
| A. | H = H g / h f |
| B. | H = H g x h f |
| C. | H = H g + h f |
| D. | H = H g - h f |
| Answer» E. | |
| 32. |
In a Kaplan turbine runner, the number of blades are generally between |
| A. | 2 to 4 |
| B. | 4 to 8 |
| C. | 8 to l6 |
| D. | 16 to 24 |
| Answer» C. 8 to l6 | |
| 33. |
The overshot water wheels are those in which the wheel runs entirely by the __________ of water. |
| A. | weight |
| B. | impulse |
| C. | - |
| D. | - |
| Answer» B. impulse | |
| 34. |
The mechanical efficiency of an impulse turbine is |
| 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 |
| Answer» C. ratio of the Work done on the wheel to the energy of the jet | |