DC THIRD CLASS STATIONARY BOILER ACTUAL EXAM
05/28/2026
LATEST 200+ QUESTIONS AND ANSWERS EXAM
DC Third Class Stationary Boiler Actual Exam Latest 200+
Questions and Answers Exam Preparation Material
_________ Are necessary for complete combustion
Time, temperature, mixture, and atomization
If the steam pressure gauge indicates 200 psig, the absolute pressure is______
214.7
A boiler is operating at 400 psi, and the safety valve opens at 410 psi and closes at 398 psi. The
blowdown is______psi
12
An oil cooler is commonly used with a(n) ________ when operating in conjunction with a turbo-
generator
Steam turbine
A boiler is producing 40,000lb of steam/hr at a pressure of 100 psi and a steam temperature of 500
degrees fahrenheit. The steam produced is _______ steam
Superheated
5/28/2026
The economizer on a boiler is used to _______
Add heat to the feed water
1
, DC THIRD CLASS STATIONARY BOILER ACTUAL EXAM
05/28/2026
LATEST 200+ QUESTIONS AND ANSWERS EXAM
Blowers are normally used with________ boilers
Water tube
Overheating of tubes on a boiler can be caused by________
Scale on tubes
Carbon dioxide in a condensate return system causes_________
Channeling
A ________ pump is a positive displacement pump
Reciprocating
A boiler generating 6000 lb of steam/hr produces _______btu/hr
6,000,000
A bottom blowdown is performed on a boiler to _____
Discharge sludge and sediment
5/28/2026
Water columns are connected to the boiler with a minimum of _______" pipe
2
, DC THIRD CLASS STATIONARY BOILER ACTUAL EXAM
05/28/2026
LATEST 200+ QUESTIONS AND ANSWERS EXAM
1
The minimum size of a water column blowdown valve is_______".
3/4
The maximum size bottom blowdown valve on a boiler is_________".
2 1/2
A ________ allows condensate to pass through, but stops steam.
A steam trap
When taking over a shift, the first thing to do is check the________
Water level in each boiler
According to the asme code, a high-pressure boiler having more than 500 square feet of heating surface
shall have________
Two or more safety valves
The probable cause of an increase in temperature of gases of combustion at the boiler outlet is____
Dirty heating services
5/28/2026
3
, DC THIRD CLASS STATIONARY BOILER ACTUAL EXAM
05/28/2026
LATEST 200+ QUESTIONS AND ANSWERS EXAM
Boilers in battery equipped with________ must have two main steam stop valves and a free-flowing
drain between them
Manhole openings
In order to be sure the gauge glass is indicating an accurate water level reading, the stationary engineer
should______
Blowdown the gauge glass
A continuous blowdown line is located___
In the steam and water drum well below the nowl
A temperature reading of 80 degrees celsius is equal to_________°f
176
A chimney temperature of 250 degrees fahrenheit above steam temperature indicates_______
Poor efficiency
A manometer is red in________
Inches of water
5/28/2026
The boiling point of water will____ with an increase in pressure
Be raised
4
05/28/2026
LATEST 200+ QUESTIONS AND ANSWERS EXAM
DC Third Class Stationary Boiler Actual Exam Latest 200+
Questions and Answers Exam Preparation Material
_________ Are necessary for complete combustion
Time, temperature, mixture, and atomization
If the steam pressure gauge indicates 200 psig, the absolute pressure is______
214.7
A boiler is operating at 400 psi, and the safety valve opens at 410 psi and closes at 398 psi. The
blowdown is______psi
12
An oil cooler is commonly used with a(n) ________ when operating in conjunction with a turbo-
generator
Steam turbine
A boiler is producing 40,000lb of steam/hr at a pressure of 100 psi and a steam temperature of 500
degrees fahrenheit. The steam produced is _______ steam
Superheated
5/28/2026
The economizer on a boiler is used to _______
Add heat to the feed water
1
, DC THIRD CLASS STATIONARY BOILER ACTUAL EXAM
05/28/2026
LATEST 200+ QUESTIONS AND ANSWERS EXAM
Blowers are normally used with________ boilers
Water tube
Overheating of tubes on a boiler can be caused by________
Scale on tubes
Carbon dioxide in a condensate return system causes_________
Channeling
A ________ pump is a positive displacement pump
Reciprocating
A boiler generating 6000 lb of steam/hr produces _______btu/hr
6,000,000
A bottom blowdown is performed on a boiler to _____
Discharge sludge and sediment
5/28/2026
Water columns are connected to the boiler with a minimum of _______" pipe
2
, DC THIRD CLASS STATIONARY BOILER ACTUAL EXAM
05/28/2026
LATEST 200+ QUESTIONS AND ANSWERS EXAM
1
The minimum size of a water column blowdown valve is_______".
3/4
The maximum size bottom blowdown valve on a boiler is_________".
2 1/2
A ________ allows condensate to pass through, but stops steam.
A steam trap
When taking over a shift, the first thing to do is check the________
Water level in each boiler
According to the asme code, a high-pressure boiler having more than 500 square feet of heating surface
shall have________
Two or more safety valves
The probable cause of an increase in temperature of gases of combustion at the boiler outlet is____
Dirty heating services
5/28/2026
3
, DC THIRD CLASS STATIONARY BOILER ACTUAL EXAM
05/28/2026
LATEST 200+ QUESTIONS AND ANSWERS EXAM
Boilers in battery equipped with________ must have two main steam stop valves and a free-flowing
drain between them
Manhole openings
In order to be sure the gauge glass is indicating an accurate water level reading, the stationary engineer
should______
Blowdown the gauge glass
A continuous blowdown line is located___
In the steam and water drum well below the nowl
A temperature reading of 80 degrees celsius is equal to_________°f
176
A chimney temperature of 250 degrees fahrenheit above steam temperature indicates_______
Poor efficiency
A manometer is red in________
Inches of water
5/28/2026
The boiling point of water will____ with an increase in pressure
Be raised
4
