250+ TOP MCQs on Water Tube Boilers and Answers

Power Plant Engineering Multiple Choice Questions on “Water Tube Boilers”.

1. In a glass rube type water indicator for a boiler, one end of the tube is connected to water space and the other end is connected to ________________
a) chimney
b) water space
c) steam space
d) super heater
Answer: c
Clarification: In a glass rube type water indicator for a boiler, one end of the tube is connected to water space and the other end is connected to the steam space.

2. The draught produced by a steam jet issuing from a nozzle placed in the ashpit under the fire grate of the furnace is called ___________
a) chimney draught
b) induced steam jet draught
c) forced steam jet draught
d) none of the mentioned
Answer: b
Clarification: The draught produced by a steam jet issuing from a nozzle placed in the ashpit under the fire grate of the furnace is called induced steam jet draught.

3. Willian’s line for the steam engine is a straight line relationship between the steam consumption per hour and ___________
a) brake power
b) indicated power
c) pressure of steam
d) efficiency
Answer: b
Clarification: Willian’s line for the steam engine is a straight line relationship between the steam consumption per hour and indicated power.

4. The natural draught is produced by ___________
a) chimney
b) centrifugal fan
c) steam jet
d) none of the mentioned
Answer: a
Clarification: The natural draught is produced by chimney.

5. Which of the following statement is wrong?
a) Water tube boilers are internally fired
b) Locomotive boiler is a water tube boiler
c) La-mont boiler is a low pressure water tube boiler
d) All of the mentioned
Answer: d
Clarification: All the mentioned statement are wrong as water-tube boilers are externally fired, locomotive boiler isn’t a water-tube boiler & La-mont boiler is a high pressure boiler.

6. An air preheater is installed ___________
a) between the economiser and chimney
b) before the superheater
c) before the economiser
d) none of the mentioned
Answer: a
Clarification: The installation of an air pre-heater is between the economiser & the chimney.

7. Which of the following statement is correct for a compound steam engine?
a) The forces in the working parts are increased as the forces are distributed over more parts
b) The cost of the engine, for the same power and economy, is more than that of a simple steam engine
c) The temperature range per cylinder is increased, with corresponding increase in condensation
d) The ratio of expansion is reduced, thus reducing the length of stroke
Answer: d
Clarification: When the ratio of expansion is reduced, the length of stroke is reduced in a compound steam engine.

8. What is the length of shell of a Locomotive boiler?
a) 2m
b) 3m
c) 4m
d) 6m
Answer: c
Clarification: The shell of a locomotive boiler has a length of 4m.

9. What is the function of a flywheel?
a) to convert reciprocating motion of the piston into rotary motion
b) to prevent fluctuation of speed
c) to keep the engine speed uniform at all load conditions
d) to convert rotary motion of the crankshaft into to and fro motion of the valve rod
Answer: b
Clarification: Flywheel is employed to prevent fluctuation of speed.

10. The shell diameter of a Locomotive boiler is?
a) 1.5m
b) 1m
c) 2m
d) 2.5m
Answer: a
Clarification: The shell diameter of a Locomotive boiler is 1.5 m.