FIRST CLASS STEAM LICENSE ACTUAL EXAM NEWEST COMPLETE 100
QUESTIONS AND CORRECT DETAILED ANSWERS| ALREADY GRADED A+
1. A first-class stationary steam engineer is preparing to assume responsibility
for a high-pressure steam plant and must demonstrate knowledge of boiler
operation, plant equipment, safety systems, and supervisory
responsibilities. Which duty most accurately represents the central
responsibility of a first-class engineer?
A. Performing only routine boiler-room cleaning
B. Operating, supervising, and maintaining the safe and efficient operation
of the steam plant
C. Repairing only electrical motors
D. Performing only laboratory water analysis
Answer: B
2. Before placing a boiler that has been shut down overnight back into service,
an engineer performs a complete inspection of the furnace, fuel system,
water level, valves, gauges, and associated equipment. What is the primary
reason for this inspection?
A. To increase the boiler's firing rate immediately
B. To determine whether the boiler can safely be returned to service
C. To eliminate the need for a prepurge
D. To reduce the steam temperature
Answer: B
3. During a boiler startup, the furnace must be properly purged before fuel is
admitted. What is the principal purpose of furnace prepurging?
A. To remove combustible gases from the furnace before ignition
B. To increase boiler-water alkalinity
C. To raise feedwater temperature
D. To increase steam pressure rapidly
Answer: A
pg. 1
, 4. A boiler operator observes that the water level is significantly below the
normal operating range. Which response is most appropriate before
continuing normal firing?
A. Increase firing rate to restore pressure
B. Determine the cause and follow the established low-water emergency
procedure
C. Close the main steam valve and immediately increase fuel flow
D. Disable the low-water cutoff
Answer: B
5. Which boiler safety device is specifically intended to prevent excessive
pressure from exceeding the safe operating pressure of the boiler?
A. Safety valve
B. Feedwater regulator
C. Flame scanner
D. Steam trap
Answer: A
6. A boiler's safety valve begins lifting as pressure reaches its set pressure.
What is the primary purpose of this action?
A. To maintain a constant water level
B. To automatically relieve excess steam pressure
C. To increase combustion efficiency
D. To remove dissolved solids
Answer: B
7. Which condition would most directly threaten boiler safety if the water
level becomes dangerously low while firing continues?
A. Excessive superheater moisture
B. Overheating of boiler heating surfaces
C. Increased condensate return
D. Reduced stack temperature
Answer: B
pg. 2
, 8. A boiler water column is installed so that the operator can observe the
approximate water level in the boiler. What is its principal function?
A. Measuring fuel pressure
B. Indicating boiler water level
C. Controlling steam temperature
D. Measuring flue-gas oxygen
Answer: B
9. A gauge glass suddenly breaks while a boiler is operating. What should the
engineer do according to established boiler emergency procedures?
A. Ignore the break if the pressure gauge is normal
B. Follow the required isolation and low-water protection procedure
C. Increase firing to maintain steam production
D. Remove the safety valve
Answer: B
10. Which instrument provides direct indication of boiler steam pressure to the
operator?
A. Bourdon-tube pressure gauge
B. Sight-feed lubricator
C. Draft fan
D. Feedwater heater
Answer: A
11. The pressure gauge on a steam boiler reads 150 psig. What does the "g" in
psig indicate?
A. Gauge pressure relative to atmospheric pressure
B. Absolute pressure
C. Vacuum pressure
D. Differential temperature
Answer: A
12. If atmospheric pressure is approximately 14.7 psi and a boiler gauge reads
100 psig, what is the approximate absolute pressure?
A. 85.3 psia
pg. 3
, B. 100 psia
C. 114.7 psia
D. 147 psia
Answer: C
13. Which fundamental thermodynamic process occurs when heat is
transferred to boiler feedwater until the water changes into steam?
A. Condensation
B. Vaporization
C. Sublimation
D. Freezing
Answer: B
14. What is the principal purpose of a boiler in a steam plant?
A. To convert water into steam by transferring heat
B. To convert steam directly into electricity
C. To remove all dissolved minerals from water
D. To compress combustion air
Answer: A
15. In a conventional boiler, which heat-transfer mechanism occurs when hot
combustion gases directly contact boiler heating surfaces?
A. Radiation only
B. Conduction only
C. Convection and conduction
D. Evaporation only
Answer: C
16. Which component transfers heat from hot flue gas to incoming feedwater
before the water enters the boiler?
A. Economizer
B. Condenser
C. Steam trap
D. Safety valve
Answer: A
pg. 4
QUESTIONS AND CORRECT DETAILED ANSWERS| ALREADY GRADED A+
1. A first-class stationary steam engineer is preparing to assume responsibility
for a high-pressure steam plant and must demonstrate knowledge of boiler
operation, plant equipment, safety systems, and supervisory
responsibilities. Which duty most accurately represents the central
responsibility of a first-class engineer?
A. Performing only routine boiler-room cleaning
B. Operating, supervising, and maintaining the safe and efficient operation
of the steam plant
C. Repairing only electrical motors
D. Performing only laboratory water analysis
Answer: B
2. Before placing a boiler that has been shut down overnight back into service,
an engineer performs a complete inspection of the furnace, fuel system,
water level, valves, gauges, and associated equipment. What is the primary
reason for this inspection?
A. To increase the boiler's firing rate immediately
B. To determine whether the boiler can safely be returned to service
C. To eliminate the need for a prepurge
D. To reduce the steam temperature
Answer: B
3. During a boiler startup, the furnace must be properly purged before fuel is
admitted. What is the principal purpose of furnace prepurging?
A. To remove combustible gases from the furnace before ignition
B. To increase boiler-water alkalinity
C. To raise feedwater temperature
D. To increase steam pressure rapidly
Answer: A
pg. 1
, 4. A boiler operator observes that the water level is significantly below the
normal operating range. Which response is most appropriate before
continuing normal firing?
A. Increase firing rate to restore pressure
B. Determine the cause and follow the established low-water emergency
procedure
C. Close the main steam valve and immediately increase fuel flow
D. Disable the low-water cutoff
Answer: B
5. Which boiler safety device is specifically intended to prevent excessive
pressure from exceeding the safe operating pressure of the boiler?
A. Safety valve
B. Feedwater regulator
C. Flame scanner
D. Steam trap
Answer: A
6. A boiler's safety valve begins lifting as pressure reaches its set pressure.
What is the primary purpose of this action?
A. To maintain a constant water level
B. To automatically relieve excess steam pressure
C. To increase combustion efficiency
D. To remove dissolved solids
Answer: B
7. Which condition would most directly threaten boiler safety if the water
level becomes dangerously low while firing continues?
A. Excessive superheater moisture
B. Overheating of boiler heating surfaces
C. Increased condensate return
D. Reduced stack temperature
Answer: B
pg. 2
, 8. A boiler water column is installed so that the operator can observe the
approximate water level in the boiler. What is its principal function?
A. Measuring fuel pressure
B. Indicating boiler water level
C. Controlling steam temperature
D. Measuring flue-gas oxygen
Answer: B
9. A gauge glass suddenly breaks while a boiler is operating. What should the
engineer do according to established boiler emergency procedures?
A. Ignore the break if the pressure gauge is normal
B. Follow the required isolation and low-water protection procedure
C. Increase firing to maintain steam production
D. Remove the safety valve
Answer: B
10. Which instrument provides direct indication of boiler steam pressure to the
operator?
A. Bourdon-tube pressure gauge
B. Sight-feed lubricator
C. Draft fan
D. Feedwater heater
Answer: A
11. The pressure gauge on a steam boiler reads 150 psig. What does the "g" in
psig indicate?
A. Gauge pressure relative to atmospheric pressure
B. Absolute pressure
C. Vacuum pressure
D. Differential temperature
Answer: A
12. If atmospheric pressure is approximately 14.7 psi and a boiler gauge reads
100 psig, what is the approximate absolute pressure?
A. 85.3 psia
pg. 3
, B. 100 psia
C. 114.7 psia
D. 147 psia
Answer: C
13. Which fundamental thermodynamic process occurs when heat is
transferred to boiler feedwater until the water changes into steam?
A. Condensation
B. Vaporization
C. Sublimation
D. Freezing
Answer: B
14. What is the principal purpose of a boiler in a steam plant?
A. To convert water into steam by transferring heat
B. To convert steam directly into electricity
C. To remove all dissolved minerals from water
D. To compress combustion air
Answer: A
15. In a conventional boiler, which heat-transfer mechanism occurs when hot
combustion gases directly contact boiler heating surfaces?
A. Radiation only
B. Conduction only
C. Convection and conduction
D. Evaporation only
Answer: C
16. Which component transfers heat from hot flue gas to incoming feedwater
before the water enters the boiler?
A. Economizer
B. Condenser
C. Steam trap
D. Safety valve
Answer: A
pg. 4
