Detroit 1st Class Stationary Engineer
Practice Test 2026 Guide
1. The reason why two different kinds of metals are Electrolytic action may occur
not used in the construction of a
boiler is because
2. A boiler is fitted with a 3" circular hand hole which 707#
is closed by an outside cover plate. The boiler is
operating at 100 psi. The total force on the bolt
holding the cover in position is
3. For each 100F drop in temperature of the stack 1.25%
gasses through an air pre-heater, there is gener-
ally an increase in efficiency of approximately
4. When conducting a conductivity test on boiler micromhos
water or condensate, the
measurement readings are in
5. Compression without change of temperature is Isothermal Compression
known as
6. The good combustion of one pound of Bitumi- 1 pounds of water
nous coal will produce
approximately
7. The most important single item affecting the Sulfur content of the fuel
dew point temperature of flue gas is the
8. The unit of thermal-conductance is called the Moht
9. The efficiency of a joint is the ratio, expressed as Solid boiler plate
a percentage, of the strength of the riveted joint
to the strength of the
10.
, The velocity of the water in down comers (feeder) Less than the water velocity in the
to water wall headers is risers
11. When a boiler is equipped with both an econo- The economizer first.
mizer and an air preheater, the hot flue gases
pass through
12. Internal treatment of boiler water will help elim- By decreasing the total amount of
inate scaling of internal boiler surfaces water impurities.
13. A two stage steam jet ejector, as used for the re- It can obtain lower pressures.
moval of air from a steam condenser, is preferred
over a single stage steam jet ejector because
14. Principal ingredients in blast furnace gas are Nitrogen, carbon dioxide and car-
bon monoxide.
15. By lowering the air pressure in contact with wa- Be reduced to below 100°F.
ter, the water boiling point can
16. A foundation 20" x 40" supports a machine that 25 psi
weighs 10 tons. Unit stress is
17. The primary reason for having downcomers Assist in boiler water circulation
placed outside of the inner casing away from the
heat of the furnace is to
18. Experience indicates that the steam pressure 3% to 6% of the boiler design
drop through a superheater is approximately pressure
19. In a vertical tubular air preheater, the air flows: Through the tubes
20. The zeolite process is also known as: An ion exchange process
,21. When washing turbine blading with wet steam: The turbine should be moving at
about a 1/4 of the rated speed
22. The complete combustion of hydrocarbons in Carbon dioxide (CO2) and water
coal will result in the formation of: (H2O)
23. An atmospheric relief valve on a condenser is Hand operated screw lift for non
usually equipped with: condensing operation
24. The most efficient electric drive for variable Shunt wound D.C. Motor
speed regulation is the:
25. The term steam blanketing means The existence of a steam film on
inner tube surfaces.
26. The temperature gradient through the tube walls Less than through a boiler tube
of an economizer is
27. The tube material for a closed feed water heater Cuprous-nickel alloy.
a 600°f may be
28. In order to combat caustic embittlement inside a Sodium carbonate.
boiler the ASME recommends maintain of certain
ratios between sodium sulfate and
29. The buckeyes engine governor regulate the Changing the angle of advance of
speed of the engine by the cut ott eccentric
30. The usual airside pressure drop through an air 5 inches water gage
preheater, for economical reasons will be approx:
31. The purpose of the radiator reservoirs on an ori- Prevent pulsations
fice type steam flow meter is to
, 32. A Mollier chart is used to determine Conditions of steam
33. Slag accumulation on the tubes in the boiler pass Decreasing the furnace tempera-
can be retarded by: ture
34. Superheater safety valves differ from boiler safe- Seat has more bevel
ty valves in that:
35. When starting up a boiler with a continuous re- Place the preheater in operation
generative type air preheater the proper proce- before firing the boiler
dure is to
36. A bubble cap tray is found in use with An evaporator
37. The principle reason for compounding engines is Reduce cylinder condensation
to:
38. The higher the A.P.I Gravity: The lower the unit weight of the oil
in Lbs/Gal
39. A Hydrostatic test shall be made with water at a Above 70° F
temperature
40. The direction of rotation of three phase motor Interchanging any two of the mo-
may be reversed by: tor leads
41. For a given output of steam the tube area re- Is greater in low pressure boilers
quired if proper circulation is to be maintained
42. The overall heat transfer rates obtained with an 500 to 2000 btu's per hour per
economizer will usually range from square foot
43. The volume of superheated steam through a non Increases
contact desuperheater
Practice Test 2026 Guide
1. The reason why two different kinds of metals are Electrolytic action may occur
not used in the construction of a
boiler is because
2. A boiler is fitted with a 3" circular hand hole which 707#
is closed by an outside cover plate. The boiler is
operating at 100 psi. The total force on the bolt
holding the cover in position is
3. For each 100F drop in temperature of the stack 1.25%
gasses through an air pre-heater, there is gener-
ally an increase in efficiency of approximately
4. When conducting a conductivity test on boiler micromhos
water or condensate, the
measurement readings are in
5. Compression without change of temperature is Isothermal Compression
known as
6. The good combustion of one pound of Bitumi- 1 pounds of water
nous coal will produce
approximately
7. The most important single item affecting the Sulfur content of the fuel
dew point temperature of flue gas is the
8. The unit of thermal-conductance is called the Moht
9. The efficiency of a joint is the ratio, expressed as Solid boiler plate
a percentage, of the strength of the riveted joint
to the strength of the
10.
, The velocity of the water in down comers (feeder) Less than the water velocity in the
to water wall headers is risers
11. When a boiler is equipped with both an econo- The economizer first.
mizer and an air preheater, the hot flue gases
pass through
12. Internal treatment of boiler water will help elim- By decreasing the total amount of
inate scaling of internal boiler surfaces water impurities.
13. A two stage steam jet ejector, as used for the re- It can obtain lower pressures.
moval of air from a steam condenser, is preferred
over a single stage steam jet ejector because
14. Principal ingredients in blast furnace gas are Nitrogen, carbon dioxide and car-
bon monoxide.
15. By lowering the air pressure in contact with wa- Be reduced to below 100°F.
ter, the water boiling point can
16. A foundation 20" x 40" supports a machine that 25 psi
weighs 10 tons. Unit stress is
17. The primary reason for having downcomers Assist in boiler water circulation
placed outside of the inner casing away from the
heat of the furnace is to
18. Experience indicates that the steam pressure 3% to 6% of the boiler design
drop through a superheater is approximately pressure
19. In a vertical tubular air preheater, the air flows: Through the tubes
20. The zeolite process is also known as: An ion exchange process
,21. When washing turbine blading with wet steam: The turbine should be moving at
about a 1/4 of the rated speed
22. The complete combustion of hydrocarbons in Carbon dioxide (CO2) and water
coal will result in the formation of: (H2O)
23. An atmospheric relief valve on a condenser is Hand operated screw lift for non
usually equipped with: condensing operation
24. The most efficient electric drive for variable Shunt wound D.C. Motor
speed regulation is the:
25. The term steam blanketing means The existence of a steam film on
inner tube surfaces.
26. The temperature gradient through the tube walls Less than through a boiler tube
of an economizer is
27. The tube material for a closed feed water heater Cuprous-nickel alloy.
a 600°f may be
28. In order to combat caustic embittlement inside a Sodium carbonate.
boiler the ASME recommends maintain of certain
ratios between sodium sulfate and
29. The buckeyes engine governor regulate the Changing the angle of advance of
speed of the engine by the cut ott eccentric
30. The usual airside pressure drop through an air 5 inches water gage
preheater, for economical reasons will be approx:
31. The purpose of the radiator reservoirs on an ori- Prevent pulsations
fice type steam flow meter is to
, 32. A Mollier chart is used to determine Conditions of steam
33. Slag accumulation on the tubes in the boiler pass Decreasing the furnace tempera-
can be retarded by: ture
34. Superheater safety valves differ from boiler safe- Seat has more bevel
ty valves in that:
35. When starting up a boiler with a continuous re- Place the preheater in operation
generative type air preheater the proper proce- before firing the boiler
dure is to
36. A bubble cap tray is found in use with An evaporator
37. The principle reason for compounding engines is Reduce cylinder condensation
to:
38. The higher the A.P.I Gravity: The lower the unit weight of the oil
in Lbs/Gal
39. A Hydrostatic test shall be made with water at a Above 70° F
temperature
40. The direction of rotation of three phase motor Interchanging any two of the mo-
may be reversed by: tor leads
41. For a given output of steam the tube area re- Is greater in low pressure boilers
quired if proper circulation is to be maintained
42. The overall heat transfer rates obtained with an 500 to 2000 btu's per hour per
economizer will usually range from square foot
43. The volume of superheated steam through a non Increases
contact desuperheater
