MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
This section includes 36 Mcqs, each offering curated multiple-choice questions to sharpen your Physics knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
The Thomson's turbine is __________ reaction turbine. |
| A. | a mixed flow |
| B. | an axial flow |
| C. | an outward flow |
| D. | an inward flow |
| Answer» E. | |
| 2. |
The Furneyron turbine is __________ reaction turbine. |
| A. | an axial flow |
| B. | an inward flow |
| C. | a mixed flow |
| D. | an outward flow |
| Answer» E. | |
| 3. |
Slip of a reciprocating pump is negative, when |
| A. | delivery pipe is long and pump is running at high speeds |
| B. | suction pipe is short and delivery pipe is long and the pump is running at low speeds |
| C. | suction pipe is long and delivery pipe is short and the pump is running at high speeds |
| D. | suction pipe is short and pump is running at low speeds |
| Answer» D. suction pipe is short and pump is running at low speeds | |
| 4. |
The depth of the bucket for a Pelton wheel is generally __________ the diameter of jet. |
| A. | 2 times |
| B. | 8 times |
| C. | equal to |
| D. | double |
| Answer» B. 8 times | |
| 5. |
The specific speed of a hydraulic turbine depends upon |
| A. | speed, power developed and head of water |
| B. | speed and power developed |
| C. | discharge and power developed |
| D. | speed and head of water |
| Answer» B. speed and power developed | |
| 6. |
An impulse turbine is used for |
| A. | medium head of water |
| B. | high head of water |
| C. | high discharge |
| D. | low head of water |
| Answer» C. high discharge | |
| 7. |
Which of the following is not an impulse turbine? |
| A. | Pelton wheel |
| B. | Girad turbine |
| C. | Turgo turbine |
| D. | Kaplan turbine |
| Answer» E. | |
| 8. |
Which of the following pump is successfully used for lifting water from deep wells? |
| A. | Reciprocating pump |
| B. | Air lift pump |
| C. | Centrifugal pump |
| D. | Jet pump |
| Answer» C. Centrifugal pump | |
| 9. |
The overall efficiency for a Pelton wheel lies between |
| A. | 0.65 to 0.75 |
| B. | 0.75 to 0.85 |
| C. | 0.50 to 0.65 |
| D. | 0.85 to 0.90 |
| Answer» E. | |
| 10. |
The hydraulic efficiency of an impulse turbine is the |
| 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» D. none of the above | |
| 11. |
Which of the following hydraulic unit is used for transmitting increased or decreased torque to the driven shaft? |
| A. | Hydraulic accumulator |
| B. | Hydraulic torque converter |
| C. | Hydraulic ram |
| D. | Hydraulic intensifier |
| Answer» C. Hydraulic ram | |
| 12. |
Head developed by a centrifugal pump is |
| A. | proportional to diameter of impeller |
| B. | proportional to diameter and speed of impeller |
| C. | none of the above |
| D. | proportional to speed of impeller |
| Answer» C. none of the above | |
| 13. |
Which of the following pump is sucessfully used for lifting water to the boilers? |
| A. | Jet pump |
| B. | Reciprocating pump |
| C. | Centrifugal pump |
| D. | Air-lift pump |
| Answer» B. Reciprocating pump | |
| 14. |
Which of the following statement is correct as regard to water wheels? |
| A. | They are suitable even for low water heads. |
| B. | They have slow speeds. |
| C. | They give constant efficiency, even if the discharge is not constant |
| D. | all of the above |
| Answer» E. | |
| 15. |
Braking jet in an impulse turbine is used |
| A. | to break the jet of water |
| B. | to bring the runner to rest in a short time |
| C. | none of these |
| D. | to change the direction of runner |
| Answer» C. none of these | |
| 16. |
Overall efficiency of a centrifugal pump is the ratio of |
| A. | actual workdone by the pump to the energy supplied to the pump by the prime mover |
| B. | energy supplied to the pump to the energy available at the impeller |
| C. | manometric head to the energy supplied by the impeller per kN of water |
| D. | energy available at the impeller to the energy supplied to the pump by the prime mover |
| Answer» B. energy supplied to the pump to the energy available at the impeller | |
| 17. |
In order to avoid cavitation in centrifugal pumps |
| A. | the delivery pressure should be high |
| B. | the suction pressure should be low |
| C. | the suction pressure should be high |
| D. | the delivery pressure should be low |
| Answer» D. the delivery pressure should be low | |
| 18. |
Dynamic similarity is said to exist between the model and the prototype, if both of them |
| A. | are identical in shape, but differ only in size |
| B. | have identical velocities |
| C. | are equal in size and shape |
| D. | none of the above |
| Answer» E. | |
| 19. |
A hydraulic ram is a device used to |
| A. | store the energy of water |
| B. | to lift small quantity of water to a greater height when a large quantity of water is available at a smaller height |
| C. | to lift water from deep wells |
| D. | increase the pressure of water |
| Answer» C. to lift water from deep wells | |
| 20. |
In an inward flow reaction turbine |
| A. | the flow of water is partly radial and partly axial |
| B. | the water enters at the centre of the wheel and then flows towards the outer periphery of the wheel |
| C. | the water flows parallel to the axis of the wheel |
| D. | the water enters the wheel at the outer periphery and then flows towards the centre of the wheel |
| Answer» E. | |
| 21. |
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. | 80 r.p.m. |
| D. | 40 r.p.m. |
| Answer» C. 80 r.p.m. | |
| 22. |
If the ratio's of the corresponding forces acting at corresponding points are equal, then the model and the prototype are said to have. |
| A. | kinematic similarity |
| B. | geometric similarity |
| C. | dynamic similarity |
| D. | none of these |
| Answer» D. none of these | |
| 23. |
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. | velocity of runner at inlet to the velocity of flow at inlet |
| C. | theoretical velocity of jet to the velocity of flow at inlet |
| D. | none of the above |
| Answer» B. velocity of runner at inlet to the velocity of flow at inlet | |
| 24. |
By fitting an air vessel to the reciprocating pump, there is always a saving of work done and subsequently saving of power.The saving in case of a double acting reciprocating pump is |
| A. | 0.88 |
| B. | 0.488 |
| C. | 0.392 |
| D. | 0.884 |
| Answer» D. 0.884 | |
| 25. |
If the ratio of all the corresponding linear dimensions are equal, then the model and the prototype are said to have |
| A. | kinematic similarity |
| B. | geometric similarity |
| C. | dynamic similarity |
| D. | none of these |
| Answer» C. dynamic similarity | |
| 26. |
The undershot water wheels are those in which |
| A. | the wheel runs partly by the weight of water and partly by the impulse of water |
| B. | the wheel runs entirely by the impulse of water |
| C. | the wheel runs entirely by the weight of water |
| D. | none of the above |
| Answer» C. the wheel runs entirely by the weight of water | |
| 27. |
The flow ratio in case of Francis turbine varies from |
| A. | 0.15 to 0.3 |
| B. | 0.4 to 0.5 |
| C. | 0.6 to 0.9 |
| D. | 1 to 5 |
| Answer» B. 0.4 to 0.5 | |
| 28. |
Which of the following pump is suitable for small discharge and high heads? |
| A. | Axial flow pump |
| B. | Mixed flow pump |
| C. | Centrifugal pump |
| D. | Reciprocating pump |
| Answer» E. | |
| 29. |
The jet ratio is defined as the ratio of the |
| A. | velocity of jet to the velocity of Pelton wheel |
| B. | diameter of jet to the diameter of Pelton wheel |
| C. | diameter of Pelton wheel to the diameter of jet |
| D. | velocity of Pelton wheel to the velocity of jet |
| Answer» D. velocity of Pelton wheel to the velocity of jet | |
| 30. |
The function of guide vanes in a reaction turbine is to |
| A. | allow the water to flow over them, without forming eddies |
| B. | all of the above |
| C. | allow the water to enter the runner without shock |
| D. | allow the required quantity of water to enter the turbine |
| Answer» C. allow the water to enter the runner without shock | |
| 31. |
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» B. Pelton wheel with two or more nozzles | |
| 32. |
In a centrifugal pump, the regulating valve is provided on the |
| A. | casing |
| B. | impeller |
| C. | delivery pipe |
| D. | suction pipe |
| Answer» D. suction pipe | |
| 33. |
The cavitation in a hydraulic machine is mainly due to |
| A. | low velocity |
| B. | high velocity |
| C. | low pressure |
| D. | high pressure |
| Answer» D. high pressure | |
| 34. |
A turbine develops 10000 kW under a head of 25 metres at 135 r.p.m. Its specific speed is |
| A. | 245 r.p.m. |
| B. | 215.5 r.p.m. |
| C. | 175.4 r.p.m. |
| D. | 275.4 r.p.m |
| Answer» B. 215.5 r.p.m. | |
| 35. |
The specific speed of a turbine is the speed of an imaginary turbine, identical with the given turbine, which |
| A. | delivers unit discharge under unit speed |
| B. | develops unit power under unit speed |
| C. | delivers unit discharge under unit head |
| D. | develops unit power under unit head |
| Answer» E. | |
| 36. |
The runaway speed of a hydraulic turbine is the speed |
| A. | at which there will be no damage to the runner |
| B. | at which the turbine will run freely without load |
| C. | corresponding to maximum overload permissible |
| D. | at full load |
| Answer» C. corresponding to maximum overload permissible | |