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STEAM BOILERS

Total questions: 50

Worksheet time: 50mins

Name
Class
Date
1.

Air preheater is used to preheat air with the help of ______

a)

Air

b)

Flue gases

c)

Water

d)

Steam

2.

_______ is the transfer of heat within a fluid, that is a liquid or gas. It is caused by a mixing action within a fluid.

a)

Conduction

b)

Convection

c)

Radation

d)

Combustion

3.

The following is the correct order of energy conversion in thermal power plants

a)

Chemical energy – Mechanical energy – Electrical energy

b)

Mechanical energy – Chemical energy – Electrical energy

c)

Wind energy – Mechanical energy – Electrical energy

d)

Heat energy – Electrical energy – Mechanical energy

4.

In thermal power plant, turbine is placed

a)

before boiler

b)

in between boiler and generator

c)

after generator

d)

any of the above

5.

In thermal power plants, the dust of flue gases is trapped by

a)

Precipitator

b)

Economizer

c)

Superheater

d)

Air preheater

6.

The path of flue gases in Thermal power plant is

a)

Boiler – Economizer – Superheater– Air preheater

b)

Boiler – Superheater – Air preheater – Economizer

c)

Boiler – Air preheater – Superheater – Economizer

d)

Boiler – Superheater – Economizer – Air preheater

7.

The following is not a component of Thermal power plant

a)

Condenser

b)

Cooling tower

c)

Turbine

d)

Fuel tank

8.

For steam boilers, the fuel(s) is (are) mainly

a)

Bituminous coal

b)

Fuel oil

c)

Natural gas

d)

All of the above

9.

The thermal efficiency of a steam power station is.......

a)

38%

b)

28%

c)

40%

d)

45%

10.

The draught produced by the chimney if due to the ____ difference between the column of hot gases inside the chimney and the cold air outside.

a)

Temperature

b)

Potential

c)

Density

d)

None of the above

11.

The major heat loss in a steam power station occurs in ........

a)

Heat chamber

b)

Penstock

c)

Spillways

d)

Condenser

12.

The cost of fuel transportation is maximum in........

a)

Hydro-electric power plant

b)

Steam power plant

c)

Nuclear power plant

d)

Wind power plant

13.

The boiler commonly used in a thermal plant are__________________.

a)

Water tube type

b)

Fire tube

c)

Both (a) & (b)

d)

None of these

14.

The equipment which produces steam pressure above (a)   bar is called high pressure boiler

15.

Steam is classified as

a)

WET STEAM

b)

DRY STEAM

c)

SUPER HEATED STEAM

d)

ALL THE ABOVE

16.

Why is high-quality steel used to make boilers

a)

Its cheaper to produce

b)

It's easier to bend and use in the manufacturing process

c)

Because boilers are subjected to high stress and heat during operation

d)

to reduce cost

17.

What forces are a boiler subjected to during operation

a)

compression

b)

tension

c)

shear

d)

all of the above

18.

It is defined as a component in the plant cycle that consists of a closed vessel that uses the heat produced by the combustion of fuel to efficiently vaporize and convert water into steam at the desired temperature and pressure.

a)

Steam Drum

b)

Boiler

c)

Furnace

d)

Reheater

19.

________is the transfer of heat through a solid object, or between two objects, as a result of physical contact.

a)

Conduction

b)

Convection

c)

Radiation

20.

It is an extremely high-temperature vapor generated by heating the saturated steam obtained by boiling water.

a)

Superheated Steam

b)

Saturated Steam

c)

Unsaturated Steam

d)

Vapor

21.

_______ is the transfer of heat within a fluid, that is a liquid or gas. It is caused by a mixing action within a fluid.

a)

Conduction

b)

Convection

c)

Radation

d)

Combustion

22.

The three ingredients needed to start a fire are fuel, heat, and ___.

a)

carbon dioxide

b)

combustible material

c)

nitrogen

d)

oxygen

23.

Which type of boiler should not be used for high pressure steam applications

a)

Cast iron

b)

Fire tube

c)

Water tube

d)

Straight tube

24.

This boiler has flue gasses passing around the tubes and water flowing through the tubes

a)

Fire tube

b)

Cast iron

c)

Condensing

d)

Water tube

25.

What is created by the boilers at the power plant?

a)

Smoke

b)

Steam

c)

Pollution

26.

Air preheater is used to preheat air with the help of ______

a)

Air

b)

Flue gases

c)

Water

d)

Steam

27.

The following is the correct order of energy conversion in thermal power plants

a)

Chemical energy – Mechanical energy – Electrical energy

b)

Mechanical energy – Chemical energy – Electrical energy

c)

Wind energy – Mechanical energy – Electrical energy

d)

Heat energy – Electrical energy – Mechanical energy

28.

In thermal power plants, the dust of flue gases is trapped by

a)

Precipitator

b)

Economizer

c)

Superheater

d)

Air preheater

29.

The following is not a component of Thermal power plant

a)

Condenser

b)

Cooling tower

c)

Turbine

d)

Fuel tank

30.

The draught produced by the chimney if due to the ____ difference between the column of hot gases inside the chimney and the cold air outside.

a)

Temperature

b)

Potential

c)

Density

d)

None of the above

31.

The primary function of a combustion control system is to regulate the ___ in a boiler.

a)

fuel supply

b)

air supply

c)

draft

d)

all of the above

32.

An operating pressure control must be connected to the ___.

a)

main steam line

b)

main feedwater line

c)

highest part of the steam side of the boiler

d)

water side of the boiler below the NOWL

33.

The two settings found on the boiler operating pressure control are used to ___.

a)

set the operating steam pressure range of the boiler

b)

eliminate low water

c)

maintain high and low fire

d)

warn the operator of flame failure

34.

boiler water is treated to prevent...

a)

scale

b)

oxygen pitting

c)

caustic embrittlement

d)

all of the above

35.

hardness is a measure of scale forming __ dissolved in water

a)

minerals

b)

pollutants

c)

gases

d)

none of the above

36.

boiler water having high alkalinity could develop ___

a)

acidic corrosion

b)

oxygen pitting

c)

caustic embrittlement

d)

warping

37.

a direct cause of overheating of the boiler tubes is ___

a)

soot formation

b)

operating at high fire

c)

insufficient air

d)

scale formation on the tubes

38.

A boiler that has water around the tubes and flue gasses inside the tubes?

a)

Scotch Marine

b)

A Tube

c)

Copper Fin

d)

Jessies Mom

39.

Steam Boilers must be blown down daily due to formation of this that drops out of the water when it is turned to steam

a)

Mud

b)

Hydrogen

c)

Oxygen

d)

Tears

40.

This is a Byproduct of incomplete combustion?

a)

Carbon Dioxide

b)

Excess Air

c)

CO

d)

O2

41.

___ draft is created by a draft fan that pulls the gases of combustion through the furnace.

a)

Forced

b)

Natural

c)

Induced

d)

Chimney

42.

Pressure at the discharge side of a forced draft fan is ___ atmospheric pressure.

a)

balanced at

b)

less than

c)

the same as

d)

greater than

43.

___ compounds are classified as a pollutant because they react with water vapor to form sulfuric acid.

a)

Carbon

b)

Ozone

c)

Nitrogen

d)

Sulfur

44.

Mechanical draft is produced by ___.

a)

the height of the chimney

b)

the diameter of the chimney

c)

power-driven fans

d)

steam jets

45.

Mechanical draft can be classified as ___.

a)

pressurized

b)

natural

c)

regenerative

d)

forced or induced

46.

The induced draft fan is located ___.

a)

between the burner and the chimney

b)

inside the air preheater

c)

at the burner

d)

in the first pass of the gases of combustion

47.

Mechanical draft is used when burning ___.

a)

fuel oil

b)

coal

c)

gas

d)

all of the above

48.

A ___ draft system is used to overcome air and gas-flow resistance

a)

secondary

b)

primary

c)

forced

d)

balanced

49.

The oldest form of draft used in a boiler is ___ draft.

a)

mechanical

b)

natural

c)

forced

d)

combination

50.

Boilers can be equipped with ___ to reduce the heat loss from the gases of combustion going to the chimney.

a)

open feedwater heaters

b)

superheaters

c)

economizers and air heaters

d)

baffles in uptakes