NTPC Power Plant JE Previous Year Question Paper

 NTPC Power Plant JE Previous Year Question Paper 

1. Which of the following is TRUE about an injector?

a) It feeds water into the boiler

b) Kinetic Energy of steam is utilized to increase velocity of feed water

c) It is used where there isn’t enough space to install feed pump

d) It is ideal for high capacity high pressure boilers

Ans. d

2. What is the function of economizer?

a) It is used to heat the feed water

b) It is used to improve the quality of steam

c) It is used to heat air being supplied for combustion

d) It separates suspended water particles from steam

Ans. a

3. Pumping efficiency of an injector is high.

a) True

b) False

Ans. b

4. Which of the following statements about vertical tube economiser (Green’s economiser) is FALSE?

a) It is used with boilers operating below 25 bars

b) It is an integral type economiser

c) The direction of flow of flue gases is opposite to that of water

d) It consists of a blow-off cock for removal of sediments

Ans. b

5. What is the function of an air preheater?

a) It increases the temperature of air before it enters the furnace

b) It increases the temperature of hot gases before they are released into the atmosphere

c) It reduces the temperature of hot gases before they are released into the atmosphere

d) It improves the quality of steam by mixing it with hot air

Ans. a

6. Convective superheater is placed in the furnace and it receives heat from the burning fuel through radiation.

a) True

b) False

Ans. b

7. Steam separator reduces the wetness of the steam before it enters the engine or turbine.

a) True

b) False

Ans. a

8. Which of the following is NOT a valid type of steam separator?

a) Baffle (Impact) type

b) Tubular type

c) Reverse current type

d) Centrifugal type

Ans. b

9. What is the function of a steam trap?

a) It is used to store stem once the generation is complete

b) It prevents the leakage of steam from the boiler

c) It is used to increase the temperature of the steam

d) It captures the condensed steam from steam pipes and steam separators

Ans. d

10. Which of the following statement about convective superheater is TRUE?

a) It is located in the furnace

b) It absorbs heat from the burning fuel through radiant process

c) It absorbs heat from the flue gases

d) It is used where very high superheat temperature is required

Ans. c

11. Which of the following is NOT a valid type of air preheater?

a) Tubular type

b) Plate type

c) Temperature type

d) Storage type

Ans. c

12. The degree of preheating does not depend on _____

a) type of fuel

b) initial temperature of air

c) type of fuel burning equipment

d) boiler and furnace ratings

Ans. d

13. Which of the following statements about superheaters is TRUE?

a) Condensation losses in the cylinders and steam pipes are reduced

b) Turbine erosion is avoided

c) Increases efficiency of the steam plant

d) Steam consumption of the engine is increased

Ans. d

14. Which of the following statements about air preheaters is FALSE?

a) It increases the temperature of air being supplied to the furnace

b) Storage type air preheaters cannot be used in larger plants

c) The temperature of the hot gases released through the chimney is kept minimum

d) It facilitates the burning of fuel

Ans. b

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