Page 1 of 16
DC THIRD CLASS STATIONARY BOILER EXAM |
{LATEST 2026/ 2027 UPDATE} COMPLETE
ACTUAL AND AUTHENTIC EXAM | BRAND NEW!
A boiler is steaming at 50% of the load, and suddenly the fire
goes out, in this case what happens to the water level? - ✔✔✔
CORRECT ANSWER > water shrinks and trips the lwco
The ______ pump is a type of pump where high pressure steam
enters the venture inlet and enter into the mixing tube with a
lower pressure but higher temp - ✔✔✔ CORRECT ANSWER >
injector
Which of the following is a technique is control nitrous oxide
emissions? - ✔✔✔ CORRECT ANSWER > s.c.r selective catalytic
The function of the diffuser of the diffuser on a turbine type
centrifugal pump is to? - ✔✔✔ CORRECT ANSWER > convert high
velocity to pressure
,Page 2 of 16
For what is the turbine extraction steam used? - ✔✔✔ CORRECT
ANSWER > heating boiler feed water
All of the following are types of synthetic refrigerant oil except? -
✔✔✔ CORRECT ANSWER > naphthenic
How do you ensure
that complete combustion will take place in the combustion
chamber? - ✔✔✔ CORRECT ANSWER > increase excess air
To protect a circuit from over current fuses are connected in? -
✔✔✔ CORRECT ANSWER > series
Which coal has the highest volume of carbon ? - ✔✔✔ CORRECT
ANSWER > anthracite
Which of the following are the correct definition of "critical
pressure" and critical temperature - ✔✔✔ CORRECT ANSWER >
critical pressure is pressure at which water and steam have the
same density ect....
Which of the following type of pumps can be started with the
discharge valve closed ? - ✔✔✔ CORRECT ANSWER > centrifugal
, Page 3 of 16
A chiller water coil is an example of _________ dehumidification? -
✔✔✔ CORRECT ANSWER > mechanical
Condensate pump remove water from the ________? - ✔✔✔
CORRECT ANSWER > condenser
The erosion which occurs when steam or high velocity fluid flows
through a throttled valve is called - ✔✔✔ CORRECT ANSWER >
wire drawing
Air is bypassed around the air heater when? - ✔✔✔ CORRECT
ANSWER > the boiler steam load is at a minimum
A high temperature hot water boiler is one where? - ✔✔✔
CORRECT ANSWER > the maximum operation temperature of the
water is in excess of 250 degrees f operation pressure exceeding
160
Which of the following oils must be used with r - 134a and 410a? -
✔✔✔ CORRECT ANSWER > polyester (pol)
DC THIRD CLASS STATIONARY BOILER EXAM |
{LATEST 2026/ 2027 UPDATE} COMPLETE
ACTUAL AND AUTHENTIC EXAM | BRAND NEW!
A boiler is steaming at 50% of the load, and suddenly the fire
goes out, in this case what happens to the water level? - ✔✔✔
CORRECT ANSWER > water shrinks and trips the lwco
The ______ pump is a type of pump where high pressure steam
enters the venture inlet and enter into the mixing tube with a
lower pressure but higher temp - ✔✔✔ CORRECT ANSWER >
injector
Which of the following is a technique is control nitrous oxide
emissions? - ✔✔✔ CORRECT ANSWER > s.c.r selective catalytic
The function of the diffuser of the diffuser on a turbine type
centrifugal pump is to? - ✔✔✔ CORRECT ANSWER > convert high
velocity to pressure
,Page 2 of 16
For what is the turbine extraction steam used? - ✔✔✔ CORRECT
ANSWER > heating boiler feed water
All of the following are types of synthetic refrigerant oil except? -
✔✔✔ CORRECT ANSWER > naphthenic
How do you ensure
that complete combustion will take place in the combustion
chamber? - ✔✔✔ CORRECT ANSWER > increase excess air
To protect a circuit from over current fuses are connected in? -
✔✔✔ CORRECT ANSWER > series
Which coal has the highest volume of carbon ? - ✔✔✔ CORRECT
ANSWER > anthracite
Which of the following are the correct definition of "critical
pressure" and critical temperature - ✔✔✔ CORRECT ANSWER >
critical pressure is pressure at which water and steam have the
same density ect....
Which of the following type of pumps can be started with the
discharge valve closed ? - ✔✔✔ CORRECT ANSWER > centrifugal
, Page 3 of 16
A chiller water coil is an example of _________ dehumidification? -
✔✔✔ CORRECT ANSWER > mechanical
Condensate pump remove water from the ________? - ✔✔✔
CORRECT ANSWER > condenser
The erosion which occurs when steam or high velocity fluid flows
through a throttled valve is called - ✔✔✔ CORRECT ANSWER >
wire drawing
Air is bypassed around the air heater when? - ✔✔✔ CORRECT
ANSWER > the boiler steam load is at a minimum
A high temperature hot water boiler is one where? - ✔✔✔
CORRECT ANSWER > the maximum operation temperature of the
water is in excess of 250 degrees f operation pressure exceeding
160
Which of the following oils must be used with r - 134a and 410a? -
✔✔✔ CORRECT ANSWER > polyester (pol)
