McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Civil Engineering .
| 1. |
A Pelton wheel is |
| A. | tangential flow impulse turbine |
| B. | inward flow impulse turbine |
| C. | outward flow impulse turbine |
| D. | inward flow reaction turbine |
| Answer» A. tangential flow impulse turbine | |
| 2. |
Which of the following statement is correct? |
| A. | The centrifugal pump is suitable for large discharge and smaller heads |
| B. | The centrifugal pump required less floor area and simple foundation as compared to reciprocating pump |
| C. | The efficiency of centrifugal pump is less as compared to reciprocating pump. |
| D. | all of the above |
| Answer» D. all of the above | |
| 3. |
The runaway speed of a hydraulic turbine is the speed |
| A. | at full load |
| B. | at which there will be no damage to the runner |
| C. | corresponding to maximum overload permissible |
| D. | at which the turbine will run freely without load |
| Answer» D. at which the turbine will run freely without load | |
| 4. |
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 |
| Answer» B. False | |
| 5. |
The gross or total head of the turbine is the |
| A. | sum |
| B. | difference |
| C. | product |
| Answer» B. difference | |
| 6. |
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» C. 82.4 r.p.m. | |
| 7. |
In a reciprocating pump, air vessels are used to |
| A. | smoothen the flow |
| B. | reduce suction head |
| C. | increase delivery head |
| D. | reduce acceleration head |
| Answer» D. reduce acceleration head | |
| 8. |
The capacity of a hydraulic accomulator is generally specified as the maximum amount of energy stored. |
| A. | True |
| B. | False |
| Answer» A. True | |
| 9. |
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» C. 1.75 kW | |
| 10. |
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 |
| Answer» B. Disagree | |
| 11. |
A turbine is required to develop 1500 kW at 300 r.p.m. under a head of 150 m. Which of the following turbine should be used? |
| A. | Pelton wheel with one nozzle |
| B. | Pelton wheel with two or more nozzles |
| C. | Kaplan turbine |
| D. | Francis turbine |
| Answer» A. Pelton wheel with one nozzle | |
| 12. |
A Kaplan turbine is an axial flow reaction turbine. |
| A. | Correct |
| B. | Incorrect |
| Answer» A. Correct | |
| 13. |
The action of a centrifugal pump is that of a reversed reaction turbine. |
| A. | Correct |
| B. | Incorrect |
| Answer» A. Correct | |
| 14. |
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» C. are identical in shape, but differ only in size | |
| 15. |
A Pelton wheel working under a constant head and discharge, has maximum efficiency when the speed ratio is |
| A. | 0.26 |
| B. | 0.36 |
| C. | 0.46 |
| D. | 0.56 |
| Answer» C. 0.46 | |
| 16. |
Delivery head of water of a centrifugal pump is inversely proportional to diameter of its impeller. |
| A. | Yes |
| B. | No |
| Answer» B. No | |
| 17. |
The efficiency of a reaction turbine for a given head |
| A. | decreases |
| B. | increases |
| Answer» A. decreases | |
| 18. |
The undershot water wheels are those in which |
| A. | the wheel runs entirely by the weight of water |
| B. | the wheel runs entirely by the impulse of water |
| C. | the wheel runs partly by the weight of water and partly by the impulse of water |
| D. | none of the above |
| Answer» B. the wheel runs entirely by the impulse of water | |
| 19. |
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 |
| Answer» A. True | |
| 20. |
Head developed by a centrifugal pump is |
| A. | proportional to diameter of impeller |
| B. | proportional to speed of impeller |
| C. | proportional to diameter and speed of impeller |
| D. | none of the above |
| Answer» C. proportional to diameter and speed of impeller | |
| 21. |
The ratio of quantity of liquid discharged per second from the pump to the quantity of liquid passing per second through the impeller is known as |
| A. | manometric efficiency |
| B. | mechanical efficiency |
| C. | overall efficiency |
| D. | volumetric efficiency |
| Answer» D. volumetric efficiency | |
| 22. |
The efficiency of a Pelton wheel working under constant head |
| A. | remains same |
| B. | increases |
| C. | decreases |
| Answer» B. increases | |
| 23. |
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» D. all of the above | |
| 24. |
The principle of jet propulsion is used in driving the ships and aeroplanes. |
| A. | Correct |
| B. | Incorrect |
| Answer» A. Correct | |
| 25. |
Which of the following statement is correct as regard to water wheels? |
| 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 |
| Answer» D. all of the above | |
| 26. |
If the ratio of corresponding velocities at corresponding points are equal, then the model and the prototype are said to have dynamic similarity. |
| A. | Right |
| B. | Wrong |
| Answer» B. Wrong | |
| 27. |
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 |
| Answer» D. none of the above | |
| 28. |
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» C. specific speed | |
| 29. |
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» D. Air-lift pump | |
| 30. |
Which of the following pump is preferred for flood control and irrigation applications? |
| A. | Centrifugal pump |
| B. | Axial flow pump |
| C. | Mixed flow pump |
| D. | Reciprocating pump |
| Answer» B. Axial flow pump | |
| 31. |
In a centrifugal pump, the regulating valve is provided on the |
| A. | casing |
| B. | delivery pipe |
| C. | suction pipe |
| D. | impeller |
| Answer» B. delivery pipe | |
| 32. |
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» A. True | |
| 33. |
For 450 m head of water, |
| A. | Pelton wheel |
| B. | Kaplan turbine |
| C. | Francis turbine |
| D. | none of these |
| Answer» A. Pelton wheel | |
| 34. |
Delivery head of a centrifugal pump is |
| A. | directly proportional to N |
| B. | inversely proportional to N |
| C. | directly proportional to N2 |
| D. | inversely proportional to N2 |
| Answer» C. directly proportional to N2 | |
| 35. |
The discharge through a turbine is |
| A. | directly proportional to H1/2 |
| B. | inversely proportional to H1/2 |
| C. | directly proportional to H3/2 |
| D. | inversely proportional to H3/2 |
| Answer» A. directly proportional to H1/2 | |
| 36. |
The flow ratio of Francis turbine is defined as the ratio of the |
| A. | velocity of flow at inlet to the theoretical jet velocity |
| B. | theoretical velocity of jet to the velocity of flow at inlet |
| C. | velocity of runner at inlet to the velocity of flow at inlet |
| D. | none of the above |
| Answer» A. velocity of flow at inlet to the theoretical jet velocity | |
| 37. |
A Kaplan turbine is preferred for a specific speed of 300 to 1000 r.p.m. |
| A. | Yes |
| B. | No |
| Answer» A. Yes | |
| 38. |
Which of the following is not a reaction turbine? |
| A. | Furneyron turbine |
| B. | Jonval turbine |
| C. | Thomson's turbine |
| D. | Pelton wheel |
| Answer» D. Pelton wheel | |
| 39. |
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 |
| Answer» D. to lift small quantity of water to a greater height when a large quantity of water is available at a smaller height | |
| 40. |
In a mixed flow centrifugal pump, the flow through the impeller is a combination of radial and axial flows. |
| A. | Correct |
| B. | Incorrect |
| Answer» A. Correct | |
| 41. |
In an impulse turbine, the pressure of water both at entering and leaving the vanes, is atmospheric. |
| A. | Agree |
| B. | Disagree |
| Answer» A. Agree | |
| 42. |
Which of the following pump is suitable for small discharge and high heads? |
| A. | Centrifugal pump |
| B. | Axial flow pump |
| C. | Mixed flow pump |
| D. | Reciprocating pump |
| Answer» D. Reciprocating pump | |
| 43. |
In a Kaplan turbine runner, the number of blades are generally between |
| A. | 2 to 4 |
| B. | 4 to 8 |
| C. | 8 to 16 |
| D. | 16 to 24 |
| Answer» B. 4 to 8 | |
| 44. |
A turbine develops 10000 kW under a head of 25 metres at 135 r.p.m. Its specific speed is |
| A. | 175.4 r.p.m. |
| B. | 215.5 r.p.m. |
| C. | 241.5 r.p.m. |
| D. | 275.4 r.p.m. |
| Answer» C. 241.5 r.p.m. | |
| 45. |
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» B. Kaplan turbine | |
| 46. |
The overshot water wheels are those in which the wheel runs entirely by the |
| A. | weight |
| B. | impulse |
| Answer» A. weight | |
| 47. |
In order to avoid cavitation in centrifugal pumps |
| A. | the suction pressure should be high |
| B. | the delivery pressure should be high |
| C. | the suction pressure should be low |
| D. | the delivery pressure should be low |
| Answer» A. the suction pressure should be high | |
| 48. |
Manometric head, in case of a centrifugal pump, is equal to |
| A. | Suction lift + Loss of head in suction pipe due to driction + Delivery lift + Loss of head in delivery pipe due to friction + Velocity head in the delivery pipe |
| B. | Workdone per kN of water - Losses within the impeller |
| C. | Energy per kN at outlet of impeller - Energy per kN at inlet of impeller |
| D. | all of the above |
| Answer» D. all of the above | |
| 49. |
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» C. energy transfer machines | |
| 50. |
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 |
| Answer» B. actual workdone by the pump to the energy supplied to the pump by the prime mover | |
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