coal broken into fine particles.

Power Plant Engineering MCQ Multiple Choice Questions Answers for Practice

Q: 2. Permissible pH value of water for boilers is

Correct Answer is: slightly more than 7

Q: 3. Heating value of coal is approximately

Correct Answer is: 5000-6500 kcal / kg

Q: 11. Soot is virtually nothing but

Correct Answer is: Please check the page for the answer.

Q: 12. Super heated steam is always

Correct Answer is: at a temperature higher than the saturation temperature corresponding to a steam pressure

Q: 13. Water is supplied to a boiler

Correct Answer is: at more than the steam pressure on the boiler.

Q: 14. Pressure of steam in condenser is

Correct Answer is: much less than pressure.

Q: 16. Which of the following is considered as superior quality of coal ?

Correct Answer is: Bituminous coal

Q: 18. Burning of low grade fuel can be improved by

Correct Answer is: Any of the above.

1. The overall efficiency of a boiler in a thermal power plant is of the order of

10%
25 to 30%
40 to 50%
70 to 80%.

2. Permissible pH value of water for boilers is

1
7
slightly more than 7
10

3. Heating value of coal is approximately

1000-2000 kcal / kg
2000-4000 kcal / kg
5000-6500 kcal / kg
9000-10,500 kcal / kg

4. The steam consumption per kWh of electricity generated in a modem power plant is of the order of

1-2 kgs
2-4 kgs
5-7 kgs
10-12 kgs.

5. What is the maximum size of steam turbine usually being installed, for thermal power plants ?

120 MW
250 MW
500 MW
1000 MW.

6. Which of the following is not the voltage at which power is usually transmitted(A)132 kV

132kV
66 kV
33 kV
20 kV.

7. Overall thermal efficiency of a steam power station is in the range

18-24%
30-40%
44-62%
68-79%.

8. Most of the generators in thermal power plants run at

3000 rpm
1500 rpm
1000 rpm
750 rpm.

9. Standard frequency usually for electric supply is

50 Hz
60 Hz
50 to 60 Hz
50 to 55 Hz.

10. A 100 MW thermal power-plant will consume nearly how many tonnes of coal in one hour ?

50 tonnes
150 tonnes
1500 tonnes
15,000 tonnes.

11. Soot is virtually nothing but

ash
cinder
gas
carbon4

12. Super heated steam is always

at a temperature higher than the saturation temperature corresponding to a steam pressure
at a pressure more than the boiler steam pressure
separated from water particles before being supplied to turbine
at a pressure less than the maximum cycle pressure.

13. Water is supplied to a boiler

at atmospheric pressure
at slightly more than atmospheric pressure
at 100 cm/kg2
at more than the steam pressure on the boiler.

14. Pressure of steam in condenser is

atmospheric pressure
more than pressure
slightly less than pressure
much less than pressure.

15. Equipment used for pulverizing the coal is known as

Ball mill
Hopper
Burner
Stoker.

16. Which of the following is considered as superior quality of coal ?

Bituminous coal
Peat
Lignite
Coke.

17. Which coal will have highest ash content ?

Bituminous coal
Grade I steam coal
Coking coal
Lignite.

18. Burning of low grade fuel can be improved by

Blending with better quality
Oil assisted ignition
Pulverizing
Any of the above.

19. A condenser in a thermal power plant condenses steam combing out of

Boiler
Super-heater
Economizer
Turbine.

20. In a power plant, coal is carried from storage place to boilers generally by means of

bucket
belts
trolleys
manually.

21. Pulverized coal is

coal free from ash
non-smoking coal
coal which bums For long time
coal broken into fine particles.

22. Live storage of coal in a power plant means

coal ready for combustion
preheated coal
storage of coal sufficient to meet 24 hour demandof the plant
coal in transit.

23. Which of the following enters the super heater of a boiler ?

Cold water
Hot water
Wet steam
Super-heated steam.

24. In regenerative cycle, bled steam is

discharged to atmosphere
condensed in steam condenser
used to beat feed water for boiler
is mixed with steam supplied to turbine.

25. When pulverized fuel is not used, the equipment used for supplying coal to the boiler is

Heater
Stoker
Burner
Skip hoist.

26. The efficiency of a thermal power plant improves with

increased quantity of coal burnt
larger quantity of water used
lower load in the plant
use of high steam pressures.

27. The equipment installed in power plants to reduce air pollution due to smoke is

Induced draft fans
De-super heaters
Electrostatic precipitators
Re-heaters.

28. As steam expands in turbine

its pressure increases
its specific volume increases
its boiling point increases
its temperature increases.

29. For low head and high discharge, the hydraulic turbine used is

Kaplan turbine
Francis turbine
Pelton wheel
Jonual turbine.

30. Which of the following, is not a high pressure boiler ?

Loeffler boiler
Lancashire boiler
Velox boiler
Lamont boiler.

Welcome to our Power Plant Engineering MCQs section. These multiple-choice questions are designed to help students and exam aspirants test their knowledge and prepare effectively for exams, interviews, and more.

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Power Plant Engineering MCQs cover a wide range of topics including thermal, nuclear, and renewable energy systems. These questions delve into the principles of power generation, plant design, operation, and maintenance, ensuring a comprehensive understanding of the subject.

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