Test Your knowledge on Boilers – Online Quiz

Boilers are used in Chemical Process Industries to produce steam which finds a wide range of uses likes to drive the steam turbines, for heating, for atomizing the fuel, as a raw material in a chemical process etc. Our Boiler Quiz module contains 30 multiple choices questions on Types of Boiler, Boiler Water Treatment, Fuels and Combustion, Boiler Operation Tips etc.

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Name

In a Fire tube boiler

Hot Gas passes through the tube

Boiler Feed water passes through the tube

None

In a Water tube boiler

Hot Gas passes through the tube

Boiler Feed water passes through the tube

None

Cold End Corrosion occurs in

Air Preheater

Furnace

Super heater Coils

None of the above

None

The purpose of Deaerator is to

Remove Suspended Solids from Feed water

Remove Dissolved Solids from Feed water

Remove Gases from Feed water

None of the above

None

Demineralisation of water is the process to remove

Dissolved gases

Dissolved salts

Carbon dioxide

Chlorine

None

The chemical dosed as ‘Oxygen Scavenger’ in boiler feed water is

Hydrazine

Ammonia

Nitrogen

Any one of the above

None

Most commonly used pump for Boiler feed water pumping application is

Single Stage Centrifugal Pump

Vertical Pump

Multi Stage Centrifugal Pump

Plunger Pump

None

Recommended excess air levels for boilers

Gas Fired < Oil Fired < Coal Fired

Coal Fired < Oil Fired < Gas Fired

Oil Fired < Gas Fired < Coal Fired

It does not depend on Fuel

None

The Circulation ratio of the boiler is High for

Natural Circulation Boilers

Forced Circulation Boilers

Once through Boilers

Constant for all Types of Boilers

None

10.

Water inventory is High in

Fire tube Boilers

Water Tube Boilers

None

11.

Which one of the following is the boiler mounting?

Safety Valves

Steam Trap

Economiser

Superheater

None

12.

Which one of the following is boiler accessory?

Safety Valves

Water Level Indicator

Economiser

Pressure Gauge

None

13.

IBD in boiler stands for

Intermittent blowdown

Intermediate blowdown

Internal blow down

None of the above

None

14.

The opening of Air preheater bypass results in

Reduction in stack temperature

Increase in stack temperature

None

15.

The three element system for controlling the boiler drum level considers which three parameters?

Feed Water Flow, Fuel Flow, Drum Level

Feed Water Flow, Combustion Air Flow, Drum Level

Feed Water Flow, Fuel Flow, Steam Flow

Feed Water Flow, Steam Flow, Drum Level

None

16.

Fuel oil is heated prior to atomization to

Increase its specific gravity

Reduce its specific gravity

Increase its viscosity

Reduce its viscosity

None

17.

What is the excess air percentage if the flue gas of gas fired boiler contains 2% Oxygen by Volume?

10%

15%

20%

None

18.

MCR in boiler refers to

Maximum Continuous Rating

Minimum Continuous Rating

Mean Continuous Rating

None of the above

None

19.

Boiler Feed Water condensate pH is maintained in the range of

2.5 to 3.5

7.5 to 9.5

0 to 14

None

20.

In a Natural Circulation boiler Circulation ratio varies ……………….. with boiler pressure

Directly

Indirectly

None

21.

NOx formed when nitrogen in fuel combines with oxygen in combustion air is called as

Fuel NOx

Prompt NOx

Thermal NOx

None of the above

None

22.

Which one of the following is TRUE for Nucleate boiling

Bubbles form and the droplets evaporates slowly

Droplet floats on a vapor cushion and evaporates very slowly

None

23.

Tri Sodium Phosphate is dosed in boiler feed water to

Control vanadium

Remove Oxygen

Prevent from hydrogen embrittlement

Convert scale forming salts to relatively harmless sludge

None

24.

Vanadium in Fuel oil is the cause for

Cold End Corrosion

Hot End Corrosion

None

25.

Conradson carbon residue is

the indication of Corrosion in boiler

the Indication of the coke-forming tendencies of an oil

the indication of Calorific value of the fuel

None of the above

None

26.

High carbon monoxide content in the flue gas of a boiler indicates

Complete combustion

Incomplete combustion

Very high excess air

High carbon content in Fuel

None

27.

Which one of the following is not an Oxygen Scavenger?

Hydrazine

Sodium Sulfite

Trisodium Phosphate

Hydroquinone

None

28.

Most widely used medium for Soot blowing applications in boiler to remove soot from boiler part during boiler in operation is

Steam

Air

Nitrogen

Dry Ice

None

29.

A higher stack temperature than normal value in a water tube boiler denotes

High Carbon content in Fuel

Scale formation on fireside

Low boiler load

Incomplete Combustion

None

30.

Scale formation on fire sire in the water tube boiler result in

High metal temperature in tubes

Reduces energy efficiency of the boiler

Increases flue gas side pressure drop

All of the above

None

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