3rd Class Stationary Engineer Detroit Practice Test Exam
Questions And 100% Correct Answers |Graded A+
(2026/2027)
Size of manhole opening
11 x 15 or 10 x 16
Lost motion in a duplex direct acting boiler feed pump
Is necessary
A scotch marine boiler is
Horizontal fire tube boiler
Lead is the amount the valve is open when the
Crank is on dead center
The slippage of a good pump should not exceed
5%
The engine having the most parts subjected to bearing wear is a
Cross-compound engine
A spring loaded pop safety valve opens wide, when pressure actuated
Suddenly
Of the pumps listed below, the one having an over speed trip device is
Centrifugal type
Of the following pumps, the one best suited for handling viscous oils is the
Rotary pump
All vertical tube boilers are of the
Fire or water tube type
For water service, the piping most subject to corrosion
1
,Steel
While in successful operation, the body of an injector is at
A pressure below 14.7 psig
The height of water in an air chamber of a pump should be at least
¾ the height of the air chamber
The least amount of scale and corrosion producing substance in feed water and steam cycle is
in
Superheated steam
It is considered good practice to open the vent cock on a boiler when
About to open the boiler for cleaning purposes and lighting off a cold boiler
It is considered good practice to test safety valves on large installations
Whenever the boiler is put in service
If a simple D-slide valve has neither lap nor lead, steam will be cut off to the cylinder
At or near the end of the stroke
Large HRT boilers usually have
Diagonal stays supporting the upper part of the tube sheet
Industrial fuel oil no. 6 has a heating value of
145,000 - 160,000 BTUs per gallon
It is considered good practice before using soot blowers with automatic combustion control
equipment to
Place the automatic control system on manual
A firebox type boiler has the furnace sheet supported by
Staybolts
A steam boiler low water cut off alarm is usually operated
By a float
Before removing the manhole plate from a boiler
Open the air cock on top of the drum
2
,The grease fitting that is used on almost all new equipment requiring ordinary use is the
Zerk fitting
A Detroit Retro Stoker
Requires a Windbox
When water in a boiler becomes dangerously low, the best procedure is
Stop the application of all heat to the boiler
Solid fuels are of
Vegetable origin
Rotary pumps are
Self-priming
It is easier to maintain high CO2 and good efficiency with less smoke with a
Thin fuel bed
The relief valve on the discharge side of a fuel oil pump usually discharges
To the suction side of the pump
The best time to remove loose and adherent sludge from inside a boiler by washing is
As soon as possible after the boiler has been drained
Which of the following methods of blowing down is in practice the most satisfactory
Continuous blowdown
Renewable links are used in conjunction with
Cartridge fuses
It is common practice when a feed water regulator is used to
Provide a by-pass around the feed water regulator
Internal cleaning is required before a new boiler is placed in service
To remove protective coating, greases and other foreign materials
In the event of low water in the boiler, the proper procedure would be to extinguish the fire
and
3
, Allow the temperature and pressure to recede gradually
If the top connection of the water glass of a boiler suddenly becomes stopped up or clogged,
the water level in the glass
Will immediately rise to the top
Concentrations of dissolved solids in boiler water will
Greater with internal treatment than external treatment
When using compressed air to clean motor windings, the air should have a
Low moisture content
In a locomotive boiler, the gases pass
Through the tubes directly to the furnace
It is considered good practice to determine the condition of blow off valves by
Observing the temperature of the blow off piping between the valves and the blow off tank
It is good practice to start a rotary pump with the discharge valve
Open during start up procedures
When replacing a fuse for an electric motor, the proper position for the switch would be
Open
If the bottom connection of the water glass suddenly becomes stopped up or closed, the
water level in the glass will
Slowly rise to the top
It is considered good practice when warming up an oil fired boiler to use
The most center burner
A slice bar is utilized in operating
A coal fired boiler
A fuse is always connected in
Series with the load
The fuel strainer having the most coarse mesh is
The suction strainer
4
Questions And 100% Correct Answers |Graded A+
(2026/2027)
Size of manhole opening
11 x 15 or 10 x 16
Lost motion in a duplex direct acting boiler feed pump
Is necessary
A scotch marine boiler is
Horizontal fire tube boiler
Lead is the amount the valve is open when the
Crank is on dead center
The slippage of a good pump should not exceed
5%
The engine having the most parts subjected to bearing wear is a
Cross-compound engine
A spring loaded pop safety valve opens wide, when pressure actuated
Suddenly
Of the pumps listed below, the one having an over speed trip device is
Centrifugal type
Of the following pumps, the one best suited for handling viscous oils is the
Rotary pump
All vertical tube boilers are of the
Fire or water tube type
For water service, the piping most subject to corrosion
1
,Steel
While in successful operation, the body of an injector is at
A pressure below 14.7 psig
The height of water in an air chamber of a pump should be at least
¾ the height of the air chamber
The least amount of scale and corrosion producing substance in feed water and steam cycle is
in
Superheated steam
It is considered good practice to open the vent cock on a boiler when
About to open the boiler for cleaning purposes and lighting off a cold boiler
It is considered good practice to test safety valves on large installations
Whenever the boiler is put in service
If a simple D-slide valve has neither lap nor lead, steam will be cut off to the cylinder
At or near the end of the stroke
Large HRT boilers usually have
Diagonal stays supporting the upper part of the tube sheet
Industrial fuel oil no. 6 has a heating value of
145,000 - 160,000 BTUs per gallon
It is considered good practice before using soot blowers with automatic combustion control
equipment to
Place the automatic control system on manual
A firebox type boiler has the furnace sheet supported by
Staybolts
A steam boiler low water cut off alarm is usually operated
By a float
Before removing the manhole plate from a boiler
Open the air cock on top of the drum
2
,The grease fitting that is used on almost all new equipment requiring ordinary use is the
Zerk fitting
A Detroit Retro Stoker
Requires a Windbox
When water in a boiler becomes dangerously low, the best procedure is
Stop the application of all heat to the boiler
Solid fuels are of
Vegetable origin
Rotary pumps are
Self-priming
It is easier to maintain high CO2 and good efficiency with less smoke with a
Thin fuel bed
The relief valve on the discharge side of a fuel oil pump usually discharges
To the suction side of the pump
The best time to remove loose and adherent sludge from inside a boiler by washing is
As soon as possible after the boiler has been drained
Which of the following methods of blowing down is in practice the most satisfactory
Continuous blowdown
Renewable links are used in conjunction with
Cartridge fuses
It is common practice when a feed water regulator is used to
Provide a by-pass around the feed water regulator
Internal cleaning is required before a new boiler is placed in service
To remove protective coating, greases and other foreign materials
In the event of low water in the boiler, the proper procedure would be to extinguish the fire
and
3
, Allow the temperature and pressure to recede gradually
If the top connection of the water glass of a boiler suddenly becomes stopped up or clogged,
the water level in the glass
Will immediately rise to the top
Concentrations of dissolved solids in boiler water will
Greater with internal treatment than external treatment
When using compressed air to clean motor windings, the air should have a
Low moisture content
In a locomotive boiler, the gases pass
Through the tubes directly to the furnace
It is considered good practice to determine the condition of blow off valves by
Observing the temperature of the blow off piping between the valves and the blow off tank
It is good practice to start a rotary pump with the discharge valve
Open during start up procedures
When replacing a fuse for an electric motor, the proper position for the switch would be
Open
If the bottom connection of the water glass suddenly becomes stopped up or closed, the
water level in the glass will
Slowly rise to the top
It is considered good practice when warming up an oil fired boiler to use
The most center burner
A slice bar is utilized in operating
A coal fired boiler
A fuse is always connected in
Series with the load
The fuel strainer having the most coarse mesh is
The suction strainer
4
