Basic Mechanical Engineering (3110006) MCQs

MCQs of Steam Boilers

Showing 11 to 20 out of 65 Questions
1 2 3 4 5 6
11.

The function of a safety valve is

(a)

to blow off steam when the pressure of steam inside the boiler exceeds the working pressure
(b)

to indicate the water level inside the boiler to an observer
(c)

to measure the pressure of steam inside the steam boiler
(d)

none of the above
Answer:

Option (a)

12.

The principal function of a stop valve is to

(a)

control the flow of steam from the boiler to the main pipe and to shut off the steam completely when required
(b)

empty the boiler when required and to discharge the mud, scale or sediments which are accumulated at the bottom of the boiler
(c)

put off the fire in the furnace of the boiler when the level of water in the boiler falls to an unsafe limit
(d)

increase the temperature of saturated steam without raising its pressure
Answer:

Option (a)

13.

 A device which is used for pumping water into the boiler is called

(a)

Economizer
(b)

Feed pump
(c)

Superheater
(d)

Air preheater 
Answer:

Option (b)

14.

A device which is used to remove the impurities from the boiler is called

(a)

economizer
(b)

feed pump
(c)

injector
(d)

blow off cock
Answer:

Option (d)

15.

A device used to put off fire in the furnace of the boiler when the water level in the boiler balls falls below the unsafe level

(a)

blow off cock
(b)

fusible plug
(c)

stop valve
(d)

safety valve
Answer:

Option (b)

16.

The purpose of boiler accessories in a boiler is to

(a)

increase thermal efficiency 
(b)

superheat the steam
(c)

increase steam pressure
(d)

all of these
Answer:

Option (a)

17.

Which of the following is not boiler accessory?

(a)

Economizer
(b)

Safety valve
(c)

Air preheater
(d)

Superheater
Answer:

Option (b)

18.

Which of the following is used to heat the feedwater by using waste heat of flue gases?

(a)

Air preheater
(b)

Superheater
(c)

Economizer
(d)

Steam separator
Answer:

Option (c)

19.

A device in which some portion of waste heat of flue gases is recovered to heat the air before it passes to the furnace for combustion purpose is known as

(a)

superheater
(b)

injector
(c)

air preheater
(d)

economizer
Answer:

Option (b)

20.

An economizer is installed in a boiler primarily to

(a)

superheat the steam
(b)

reduce fuel consumption
(c)

increase steam pressure
(d)

all of these
Answer:

Option (b)

Showing 11 to 20 out of 65 Questions
1 2 3 4 5 6