250+ TOP MCQs on Steam Generator Types – I and Answers

Power Plant Engineering Multiple Choice Questions on “Steam Generator Types – I”.

1. Which of the following auxiliaries are not used in steam Generators?
a) economiser
b) burner
c) fan
d) stoker
Answer: a
Clarification: Burner, fan, stoker, pulverisers, etc. are the various auxiliaries that are used in steam generators.
An economiser is a part of the steam generation plant.

2. The formation of scale boiler leads to _________
a) decrease in efficiency of boiler
b) increase in efficiency of boiler
c) increase in heat transfer
d) decrease in maintenance of boiler
Answer: a
Clarification: Efficiency of boiler is inversely proportional to the scale formation.

3. What is the pH value of water permissible for boiler?
a) 0
b) 7
c) slightly less than 7
d) slightly more than 7
Answer: c
Clarification: The pH value of water used in the boiler is slightly greater than 7 for most of the commonly used boiler.

4. Which device used to separate condensate from the steam without letting steam escape?
a) condenser
b) steam valve
c) steam trap
d) none of the mentioned
Answer: c
Clarification: The steam trap is a device that is used to separate condensate from the steam without letting steam escape.

5. What is the disadvantage of natural draught?
a) it has less life
b) it has more maintenance cost of cleaning and more capital cost to build the chimney
c) the available draught decreases with increasing outside air temperature
d) all of the mentioned
Answer: c
Clarification: The only disadvantage of natural draught is that the available draught decreases with increasing the outside temperature.

6. The natural draught in the steam generator depends upon _________
a) the air condition outside the chimney
b) the temperature of exhaust gases
c) the air condition outside the chimney & the temperature of exhaust gases
d) none of the mentioned
Answer: c
Clarification: The natural draught in the steam generator depends upon the air condition outside chimney & the temperature of the exhaust gases.

7. What is the purpose of super heater in a boiler?
a) to increase the temperature of saturated steam with increase in its pressure
b) to increase the temperature of saturated steam without increase in its pressure
c) to increase the temperature of feedwater for better efficiency
d) none of the mentioned
Answer: b
Clarification: Superheater in a boiler has the function of increasing the temperature of saturated steam without increase in its pressure.

8. How is the natural draught produced for exhaust gases?
a) by using fan
b) by using chimney
c) by using gravity
d) none of the mentioned
Answer: b
Clarification: The natural draught is produced for exhaust gases by using chimney.

9. What is the purpose of using economizer in the boiler?
a) to heat feed water by utilizing heat from exhaust gases
b) to heat feed water by utilizing some heat from superheated steam
c) to superheat steam
d) none of the mentioned
Answer: a
Clarification: The use of Economiser in a boiler is to heat the feed water by utilizing heat from exhaust gases.

10. Comparing fire tube and water tube boilers, which boiler can produce comparatively higher pressure steam than another for the same capacity?
a) fire tube boiler
b) water tube boiler
c) both can produce steam at same pressure for the same capacity
d) none of the mentioned
Answer: b
Clarification: A water tube boiler can produce comparatively higher pressure steam than another for the same capacity.