Power Generation Technology MCQ ON Thermal power plant : 


1.Out of the following which one is not a unconventional source of energy ?

(A) Tidal power

(B) Geothermal energy

(C) Nuclear energy

(D) Wind power. 
 Ans:C

2.Pulverized coal is...

A.coal free from ash

B.non-smoking coal

C.coal which bums For long time

D.coal broken into fine particles.
 Ans:D

3. Heating value of coal is approximately

A..1000-2000 kcal / kg

B.2000-4000 kcal / kg

C.5000-6500 kcal / kg

D.9000-10,500 kcal / kg. 
Ans:C

4. Water gas is a mixture of

A.CO2 and O2

B.O2and H2

C.H2, N2 and O2

D.CO, N2 and H2. 
Ans:D

5. Coal used in power plant is also known as

steam coal

charcoal

coke

soft coal. 
Ans:A

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

Bituminous coal

Peat

Lignite

Coke.

Ans:A

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

bucket

belts

trolleys

manually. 
Ans:B
8. Live storage of coal in a power plant means

coal ready for combustion

preheated coal

storage of coal sufficient to meet 24 hour demand of the plant

coal in transit. 
Ans:C

9. Pressure of steam in condenser is

atmospheric pressure

more than pressure

slightly less than pressure

much less than pressure.
 Ans:D

10. Equipment used for pulverizing the coal is known as

Ball mill

Hopper

Burner

Stoker. 
Ans:A

11. Power plants using coal work closely on known which of the following cycle ?

Otto cycle

Binary vapor cycle

Brayton cycle

Rankine cycle. 
Ans:D

12. Critical pressure of water is

1 kg / cm2

100 kg / cm2

155 kg / cm2

213.8 kg / cm2. 
Ans:D

13. 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. 
Ans:D


14.Which of the following contributes to the improvement of efficiency of Rankine cycle in a thermal power plant ?

(A) Reheating of steam at intermediate stage

(B) Regeneration use of steam for heating boiler feed water

(C) Use of high pressures

(D) All of the above. 
Ans:D

15.Steam pressures usually used in thermal power plants are

(A) 5 kg/cm2 to 10 kg / cm2

(B) 50 kg/cm2 to 100 kg / cm2

(C) 110 kg/cm2 to 170 kg / cm2

(D) 200 kg/cm2 to 215 kg / cm2
 Ans:C

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

(A) Heater

(B) Stoker

(C) Burner

(D) Skip hoist.
 Ans:B

17.Burning of low grade fuel can be improved by

(A) Blending with better quality

(B) Oil assisted ignition

(C) Pulverizing

(D) Any of the above.
 Ans:D

18.As steam expands in turbine

its pressure increases

its specific volume increases

its boiling point increases

its temperature increases.
 Ans:B

19. 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. 
Ans:D

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

Cold water

Hot water

Wet steam

Super-heated steam.
 Ans:C

21. 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.

Ans:A

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

Induced draft fans

De-super heaters

Electrostatic precipitators

Re-heaters. 
Ans:C

23. Permissible pH value of water for boilers is

1

7

slightly more than 7

10
Ans:C

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

Boiler

Super-heater

Economizer

Turbine. 
Ans:D

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

Loeffler boiler

Lancashire boiler

Velox boiler

Lamont boiler. 
Ans:B

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

250 MW

500 MW

1000 MW.

Ans:C

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

(A) 18-24%

(B) 30-40%

(C) 44-62%

(D) 68-79%. 
Ans:A

28.Which of the following is not the voltage at which power is usually transmitted

(A)132 kV

(B) 66 kV

(C) 33 kV

(D) 20 kV. 
Ans:D

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

(A) 3000 rpm 
(B)1500 rpm
(C) 1000 rpm
(D) 750 rpm. 
Ans:A

30.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. Ans:C

31. Standard frequency usually for electric supply is

50 Hz

60 Hz

50 to 60 Hz

50 to 55 Hz.
 Ans:A

32. In power station practice "spinning reserve" is.....

reserve generating capacity that is in operation but not in service

reserve generating capacity that is connected to bus and ready to take the load

reserve generating capacity that is available for service but not in operation

capacity of the part of the plant that remains under maintenance.

Ans:B

33. Bagasse is.....

A.low quality coal

B.a fuel consisting of wood

C.fibrous portion of sugarcane left after extracting the juice

D.a kind of rice straw. 
Ans:C

34. Low grade fuels have

low moisture content

low ash content

low calorific value

low carbon content.
 Ans:C

35. Which variety of coal has lowest calorific value?

Steam-coal

Bituminous coal

Lignite

Anthracite. 
Ans:C
36. In a steam locomotive the engine is

Single cylinder

Vertical

Condensing

Non-condensing.
 Ans: D

37. The boilers using lignite as fuel do not use

under feed stoker

traveling grate stoker

spreader stoker

all of the above. 
Ans:A

38. In a steam turbine cycle, the lowest pressure occurs in

turbine inlet

boiler

condenser

super heater. 
Ans:C

39. Steam pressure in modem thermal plants of 100 MW and above capacity may be exacted to be

A.10 kg/cm2

(B) 50 kg/cm2

(C) up to 100kg/cm2

D.more than 100 kg/cm2.
 Ans:D

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

(A)10%

25 to 30%

40 to 50%

70 to 80%. Ans:D

41. Chemical composition of coal is given by

Proximate analysis

Ultimate analysis

Orast analysis

All of the above. Ans:B

42. Which coal will have highest ash content ?

Bituminous coal

Grade I steam coal

Coking coal

Lignite. Ans:D
43. Ash content of most of the Indian coals is around

1%

5%

10%

20%.

Ans:D

44. Ash content of coal can be reduced by

slow burning

washing

pulverizing

mixing with high grade coal. Ans:B

45. 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. Ans:A

46. 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. Ans:C

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

Kaplan turbine

Francis turbine

Pelton wheel

Jonual turbine.
 Ans:A

48. Soot is virtually nothing but

A.ash

B.cinder

C.gas

D.carbon 
Ans:D