MCQOPTIONS
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MCQOPTIONS
This section includes 13 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. |
Which of the following statements is FALSE about by-pass governing? |
| A. | There is curving observed in Willan s line |
| B. | When the by-pass valve is opened efficiency is reduced |
| C. | Opening of by-pass valve reduces the work output of lower stages |
| D. | By-pass valve opens after throttle valve has opened to a definite threshold amount |
| Answer» C. Opening of by-pass valve reduces the work output of lower stages | |
| 2. |
Which of the following method of steam turbine governing is ideal for reaction turbines? |
| A. | Throttle governing |
| B. | Nozzle governing |
| C. | By-pass governing |
| D. | Combination of throttle and by-pass governing |
| Answer» E. | |
| 3. |
Which of the following statements is FALSE regarding nozzle-governing in steam turbines? |
| A. | It can only be applied to the first stage of the turbine |
| B. | Nozzle governing is more efficient than throttle governing |
| C. | It can also be employed for large turbines having an impulse stage followed by an impulse reaction turbine |
| D. | It is cannot be employed for simple impulse turbine |
| Answer» E. | |
| 4. |
In nozzle governing, when the load on the turbine deviates from the design load, steam supply to a group of nozzles could be varies to restore the original speed. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 5. |
In nozzle governing, under full load condition what can be said about regulating valves? |
| A. | They are fully open |
| B. | They are fully closed |
| C. | They are partially open |
| D. | Depends on the input |
| Answer» B. They are fully closed | |
| 6. |
Carrying out throttle governing at low loads reduces the turbine efficiency. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 7. |
Which of the following is the correct equation for Willan s line? |
| A. | m<sub>s<sub>0</sub></sub>=KM+m<sub>s</sub> |
| B. | m<sub>s<sub>0</sub></sub>=M/K+m<sub>s</sub> |
| C. | m<sub>s</sub>=KM+m<sub>s<sub>0</sub></sub> |
| D. | m<sub>s</sub>=M/K+m<sub>s<sub>0</sub></sub> |
| Answer» D. m<sub>s</sub>=M/K+m<sub>s<sub>0</sub></sub> | |
| 8. |
The relationship between steam consumption and load in throttle governing is given by _____ |
| A. | Wilson s line |
| B. | Wilkinson s line |
| C. | Willan s line |
| D. | Wilber s line |
| Answer» D. Wilber s line | |
| 9. |
The oil servomotor in case of throttle governing mechanism is controlled by a _____ governor. |
| A. | centrifugal |
| B. | reciprocatory |
| C. | diaphragm |
| D. | gear |
| Answer» B. reciprocatory | |
| 10. |
In case of throttle governing, the beat valve is operated using oil supply. The oil is supplies using a _____ |
| A. | centrifugal pump |
| B. | servomotor |
| C. | reciprocatory pump |
| D. | diaphragm pump |
| Answer» C. reciprocatory pump | |
| 11. |
Which of the following statements about throttle governing is wrong? |
| A. | It cannot be used in small turbines |
| B. | It has a relatively simpler mechanism |
| C. | Steam is throttled whenever the load falls below the design load |
| D. | Its initial cost is less |
| Answer» B. It has a relatively simpler mechanism | |
| 12. |
Which of the following is NOT a method of steam turbine governing? |
| A. | By-pass governing |
| B. | Throttle governing |
| C. | Steam governing |
| D. | Nozzle governing |
| Answer» D. Nozzle governing | |
| 13. |
What is the objective of steam turbine governing? |
| A. | To keep turbine load constant irrespective of the turbine speed |
| B. | To keep turbine speed constant irrespective of the load |
| C. | To enhance the output of the turbine |
| D. | To reduce the losses in the turbine |
| Answer» C. To enhance the output of the turbine | |