MCQOPTIONS
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MCQOPTIONS
This section includes 11 Mcqs, each offering curated multiple-choice questions to sharpen your Thermal Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
For a given centrifugal pump _____ |
| A. | The discharge varies directly as the speed |
| B. | The head varies inversely as the speed |
| C. | The power varies as the square of the speed |
| D. | The discharge varies as the square of the speed |
| Answer» B. The head varies inversely as the speed | |
| 2. |
Why is a minimum of net positive suction head (NPSH) required for a hydraulic pump? |
| A. | To prevent cavitation |
| B. | To increase discharge |
| C. | To increase suction head |
| D. | To increase efficiency |
| Answer» B. To increase discharge | |
| 3. |
Negative slip occurs in reciprocating pumps, when delivery pipe is ______ |
| A. | Long and suction pipe is short and pump is running at low speed |
| B. | Long and suction pipe is short and pump is running at high speed |
| C. | Short and suction pipe is long and pump is running at low speed |
| D. | Short and suction pipe is long and pump is running at high speed |
| Answer» B. Long and suction pipe is short and pump is running at high speed | |
| 4. |
Why an air vessel is used in a reciprocating pump? |
| A. | To obtain a continuous supply of water at uniform rate |
| B. | To reduce suction head |
| C. | To increase the delivery head |
| D. | To reduce cavitation |
| Answer» B. To reduce suction head | |
| 5. |
When the speed of the centrifugal pump is doubled, the power required to drive the pump will be _____ |
| A. | Increase 8 times |
| B. | Increase 4 times |
| C. | Double |
| D. | Remain the same |
| Answer» B. Increase 4 times | |
| 6. |
Which of the following is not an advantage of centrifugal pump? |
| A. | Low initial cost |
| B. | High efficiency |
| C. | Difficult installation |
| D. | Easy maintenance |
| Answer» D. Easy maintenance | |
| 7. |
The rise in pressure head at any point of the impeller is proportional to ______ |
| A. | ( frac{u^3}{2g} ) |
| B. | ( frac{u^2}{2g} ) |
| C. | ( frac{u^3}{3g} ) |
| D. | ( frac{u^2}{g} ) |
| Answer» C. ( frac{u^3}{3g} ) | |
| 8. |
Hydraulic machine convert mechanical energy into hydraulic energy by means of centrifugal force acting on the fluid ______ |
| A. | Centrifugal pump |
| B. | Rotary pump |
| C. | Multiple rotor |
| D. | Reciprocating pump |
| Answer» B. Rotary pump | |
| 9. |
Dynamic pumps are also known as ______ |
| A. | Positive displacement pumps |
| B. | Non-positive displacement pumps |
| C. | Reciprocating pump |
| D. | Rotary pump |
| Answer» C. Reciprocating pump | |
| 10. |
Which of the following is a dynamic pump? |
| A. | Centrifugal pump |
| B. | Rotary pump |
| C. | Multiple rotor |
| D. | Reciprocating pump |
| Answer» B. Rotary pump | |
| 11. |
Which hydraulic machine convert mechanical energy into pressure energy? |
| A. | Pump |
| B. | Refrigerator |
| C. | Heat engine |
| D. | Turbine |
| Answer» B. Refrigerator | |