WorksheetsCertified Plant Mechanic Boiler Quiz
Total questions: 30
Worksheet time: 30mins
What is the main function of a boiler?
Cool water
Produce steam
Compress air
Purify water
Which of the following is a fire-tube boiler?
Babcock and Wilcox
La Mont
Locomotive
Benson
In water-tube boilers,
Water flows inside the tubes
Flue gases flow inside the tubes
Water and gas flow in the same direction
There are no tubes
The function of the safety valve is to:
Control water level
Maintain pressure
Release excess steam pressure
Prevent backflow
What device removes sediment from the boiler?
Economizer
Blowdown valve
Steam trap
Fusible plug
A fusible plug is used to:
Increase boiler pressure
Shut off the steam
Protect boiler against low water
Clean the tubes
The water level in a boiler is checked by:
Pressure gauge
Steam trap
Water level indicator
Feed check valve
Boiler efficiency is defined as:
Heat input / Heat output
Useful heat output / Heat input
Heat loss / Total heat
Steam output / Fuel input
A steam boiler operates under what type of pressure?
Vacuum
Atmospheric
Below atmospheric
Above atmospheric
The pressure gauge in a boiler measures:
Steam temperature
Water pressure
Flue gas pressure
Boiler steam pressure
The device used to preheat feedwater using exhaust gases is:
Superheater
Economizer
Steam separator
Air preheater
Boiler scale is caused by:
Combustion of fuel
High pressure
Impurities in feedwater
Low steam velocity
The purpose of a steam trap is to:
Trap steam
Remove air from boiler
Remove condensate without steam loss
Prevent scale formation
Which of the following is used to increase steam temperature?
Superheater
Economizer
Deaerator
Condenser
Priming in boilers is:
The heating of feedwater
Carryover of water particles with steam
Mixing of fuel and air
Sludge formation
What causes foaming in boilers?
Excess oil and alkalinity
Low temperature
High flue gas velocity
Air leak
What is the recommended action when the water level is below the low-water mark?
Add feedwater immediately
Stop the burner and inspect
Open safety valve
Increase steam demand
Which boiler component controls the entry of feedwater?
Steam stop valve
Safety valve
Feed check valve
Economizer
The combustion of fuel in a boiler takes place in the:
Chimney
Furnace
Steam drum
Economizer
The term "boiler horsepower" is defined as:
1 hp = 745.7 watts
1 hp = 550 ft-lb/sec
1 hp = 34.5 lbs of steam/hr at 212°F
1 hp = 10,000 Btu/hr
Which of the following is a high-pressure boiler?
Cochran
Locomotive
Babcock and Wilcox
Lancashire
The function of a superheater is to:
Increase pressure
Remove water
Remove dissolved gases
Increase temperature of steam
A deaerator is used to remove:
Hardness
Sludge
Air and oxygen
Oil content
Which boiler part collects steam from water?
Steam drum
Mud drum
Economizer
Superheater
Boiler blowdown is done to:
Increase pressure
Reduce water level
Remove impurities
Reduce noise
When steam is used directly for heating, the system is called:
Indirect system
Closed loop system
Direct system
Condensing system
The air preheater is installed between:
Boiler and steam turbine
Chimney and economizer
Economizer and chimney
Superheater and economizer
A vertical boiler has:
Tubes placed vertically
Chimney installed vertically
Shell in vertical direction
Water flow vertically
Excess air in the combustion chamber may cause:
Soot formation
Complete combustion
Heat loss
Increased steam generation
Boiler tubes are commonly made of:
Copper
Cast iron
Mild steel
Alloy steel
