Top 550+ Solved Thermal Engineering 2 MCQ Questions Answer

From 211 to 225 of 514

Q. What is the function of fusible plug in the boiler?

a. protect the fire tube

b. to trip on overload

c. to act as a junction switch

d. to maintain pressure

  • a. protect the fire tube

Q. What is the function of safety valves in the boiler?

a. to prevent excessive steam pressure

b. to prevent excessive air pressure

c. to prevent water pressure

d. to prevent from rising temperatures

  • a. to prevent excessive steam pressure

Q. What happens due to high temperature of feeds water in the economizer?

a. fuel consumption increases

b. fuel mechanical efficiency increases

c. fuel consumption decreases

d. fuel mechanical efficiency decreases

  • c. fuel consumption decreases

Q. What is the function of superheater in the boiler?

a. increase the temperature of steam

b. reheat the steam

c. superheat the feed water

d. to heat the fuel gas

  • a. increase the temperature of steam

Q. What is the function Air heater in the boiler?

a. preheat the air before entering the boiler

b. recover the heat from flue gas

c. heating of economizer tubes

d. reheat the gas coming out of economizer

  • b. recover the heat from flue gas

Q. Tubular air preheater of a boiler is also called as                    

a. recuperative air preheater

b. elliptical air preheater

c. ovoid air preheater

d. squarish air preheater

  • a. recuperative air preheater

Q. What does regenerative air preheater consists of?

a. rotor

b. skewers

c. propeller

d. piston

  • a. rotor

Q. What is the function of the feed water pump of a boiler?

a. pump water at high pressure

b. to pump water at lower pressure

c. to pull back the water from boiler

d. to convert steam into water after the boiler process

  • a. pump water at high pressure

Q. Rotary pumps are driven by                    

a. electric motors

b. batteries

c. diesel engines

d. biogas fuel

  • a. electric motors

Q. Which fuel is prepared by moulding finely ground coal under pressure?

a. coke

b. charcoal

c. briquette coal

d. lignite

  • c. briquette coal

Q. Which fuel is produced by powdering low grade coal with high ash content?

a. coke

b. pulverized coal

c. charcoal

d. briquette coal

  • b. pulverized coal

Q. Which is the correct advantage of solid fuels out of the given option?

a. they have low ignition temperature

b. they produce small amount of smoke

c. they have higher calorific value

d. they do not form any clinker

  • a. they have low ignition temperature

Q. Choose the proper disadvantage of solid fuels out of the given option?

a. they produce lot of smoke

b. they have low ignition temperature

c. they are high in production cost

d. they cannot be easily transported

  • a. they produce lot of smoke
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