Stationary Engineer License Exam Test Bank 1 With 250
Real Past Exam Questions and Correct Answers/ Latest
Stationary Engineer License Exam Review 2026-2027
Questions derived from the "Boiler Operator's Exam Prep Guide" by Theodore
Sauselein
1
,Heavy accumulation of soot in a boiler will result in
A. loss of boiler efficiency
B. loss of the fire
C. improved heat transfer across the tubes
D. reduced stack temperature
A. Loss of boiler efficiency
Which of the following would MOST improve boiler efficiency?
a. deaerator
b. open feedwater heater
c. economizer
d. closed feedwater heater
c. economizer
The purpose of a steam trap is to
a. add condensate and air
b. drain condensate and air
c. catch dirt and rust
d. do none of the above
b. drain condensate and air
On an inverted bucket steam trap,what happens to the bucket as the trap fills with
water?
a. it rises
b. it inclines
c. it sinks
d. it remains stationary
c. it sinks
Which steam trap has no moving parts?
a. inverted bucket
b. impulse
c. continuous flow
d. float
c. continuous flow
2
,What results when steam blows through a trap?
a. lower plant efficiency
b. noise
c. loss of steam
d. all of the above
d. all of the above
What happens when the float in a float & thermostatic trap develops a leak?
a. it becomes steam bound
b. it becomes air bound
c. it fails open
d. it fails closed
c. it fails open
The chemical used to prevent oxidation is
a. sodium sulfite
b. sodium phosphate
c. calcium phosphate
d. magnesium phosphate
a. sodium sulfite
Feedwater is treated to
a. decrease the need for makeup
b. increase circulation
c. decrease dissolved solids
d. prevent scale formation
d. prevent scale formation
The boiler vent valve is located on the
A. top of the steam drum
B. bottom of the steam drum
C. top of the mud drum
D. top of the water drum
A. Top of the steam drum
The purpose of the hole at the end of a staybolt is
A. indicate how much water in is the boiler
3
, B. indicate a cracked or broken staybolt
C. help the boiler operator operate more efficiently
D. provide a means for attaching insulation to a boiler
B. indicate a cracked or broken staybolt
A fusible plug melts at
A. 212F
B. 450F
C. 1000F
D. None of the above
B. 450F
As the firing rate increases in a boiler equipped with a convection superheater, the
steam temperature
A. increases
B. decreases
C. stays constant
D. both increases and decreases
A. Increases
When boilers are connected to a common header, it is required that an ample free
blowing drain be provided between the stop valves if either or both boilers have
A. handholes
B. manholes
C. over 10 tubes or flues
D. more than one safety valve
B. manholes
It is permissible to have only one bottom blowdown valve on a boiler when the
A. MAWP does not exceed 100 psi
B. MAWP exceeds 125 psi
C. heating surface does not exceed 100 sq ft
D. heating surface does not exceed 250 sq ft
A. MAWP does not exceed 100 psi
When the boiler pressure exceeds _____ psi it is required that extra heavy pipe be
used on the blowoff system
4
Real Past Exam Questions and Correct Answers/ Latest
Stationary Engineer License Exam Review 2026-2027
Questions derived from the "Boiler Operator's Exam Prep Guide" by Theodore
Sauselein
1
,Heavy accumulation of soot in a boiler will result in
A. loss of boiler efficiency
B. loss of the fire
C. improved heat transfer across the tubes
D. reduced stack temperature
A. Loss of boiler efficiency
Which of the following would MOST improve boiler efficiency?
a. deaerator
b. open feedwater heater
c. economizer
d. closed feedwater heater
c. economizer
The purpose of a steam trap is to
a. add condensate and air
b. drain condensate and air
c. catch dirt and rust
d. do none of the above
b. drain condensate and air
On an inverted bucket steam trap,what happens to the bucket as the trap fills with
water?
a. it rises
b. it inclines
c. it sinks
d. it remains stationary
c. it sinks
Which steam trap has no moving parts?
a. inverted bucket
b. impulse
c. continuous flow
d. float
c. continuous flow
2
,What results when steam blows through a trap?
a. lower plant efficiency
b. noise
c. loss of steam
d. all of the above
d. all of the above
What happens when the float in a float & thermostatic trap develops a leak?
a. it becomes steam bound
b. it becomes air bound
c. it fails open
d. it fails closed
c. it fails open
The chemical used to prevent oxidation is
a. sodium sulfite
b. sodium phosphate
c. calcium phosphate
d. magnesium phosphate
a. sodium sulfite
Feedwater is treated to
a. decrease the need for makeup
b. increase circulation
c. decrease dissolved solids
d. prevent scale formation
d. prevent scale formation
The boiler vent valve is located on the
A. top of the steam drum
B. bottom of the steam drum
C. top of the mud drum
D. top of the water drum
A. Top of the steam drum
The purpose of the hole at the end of a staybolt is
A. indicate how much water in is the boiler
3
, B. indicate a cracked or broken staybolt
C. help the boiler operator operate more efficiently
D. provide a means for attaching insulation to a boiler
B. indicate a cracked or broken staybolt
A fusible plug melts at
A. 212F
B. 450F
C. 1000F
D. None of the above
B. 450F
As the firing rate increases in a boiler equipped with a convection superheater, the
steam temperature
A. increases
B. decreases
C. stays constant
D. both increases and decreases
A. Increases
When boilers are connected to a common header, it is required that an ample free
blowing drain be provided between the stop valves if either or both boilers have
A. handholes
B. manholes
C. over 10 tubes or flues
D. more than one safety valve
B. manholes
It is permissible to have only one bottom blowdown valve on a boiler when the
A. MAWP does not exceed 100 psi
B. MAWP exceeds 125 psi
C. heating surface does not exceed 100 sq ft
D. heating surface does not exceed 250 sq ft
A. MAWP does not exceed 100 psi
When the boiler pressure exceeds _____ psi it is required that extra heavy pipe be
used on the blowoff system
4
