1. What is the primary responsibility of a Maryland Stationary Engineer
Grade 1?
A. Performing routine maintenance only
B. Assisting junior engineers
C. Supervising operation of boilers and mechanical systems
D. Cleaning boiler rooms
ANSWER : C
Explanation:
Grade 1 engineers are responsible for supervision, operation, and safety of
high-pressure boilers, chillers, turbines, and auxiliary systems—not just
maintenance.
2. Which device prevents boiler pressure from exceeding safe limits?
A. Pressure gauge
B. Safety valve
C. Feedwater pump
D. Economizer
ANSWER : B
Explanation:
The safety valve automatically relieves excess pressure to prevent explosion.
Pressure gauges only indicate pressure.
3. A sudden drop in boiler water level could indicate:
A. Proper firing
B. Plugged safety valve
,C. Feedwater failure or leak
D. Normal operation
ANSWER : C
Explanation:
Low water conditions are dangerous and often caused by feedwater pump
failure, leaks, or faulty controls.
4. Which fuel produces the highest BTU per pound?
A. Wood
B. Coal
C. Natural gas
D. Fuel oil
ANSWER : D
Explanation:
Fuel oil has a higher heat value per pound compared to coal, gas, or wood.
5. What is the purpose of boiler blowdown?
A. Increase pressure
B. Remove sludge and dissolved solids
C. Improve combustion
D. Add feedwater
ANSWER : B
Explanation:
Blowdown removes sediment and dissolved solids that can cause scaling and
corrosion.
6. Which condition is most dangerous to a boiler?
A. High water level
B. Low water level
C. Normal pressure
D. Slight scale formation
ANSWER : B
,Explanation:
Low water can expose boiler tubes, causing overheating and potential
explosion.
7. What instrument measures boiler draft?
A. Barometer
B. Manometer
C. Ammeter
D. Thermocouple
ANSWER : B
Explanation:
A manometer measures pressure differences, including draft in boilers and
flues.
8. The primary function of an economizer is to:
A. Reduce pressure
B. Increase stack temperature
C. Recover waste heat
D. Remove soot
ANSWER : C
Explanation:
Economizers preheat feedwater using flue gases, improving efficiency.
9. What type of valve is commonly used for throttling flow?
A. Gate valve
B. Globe valve
C. Check valve
D. Safety valve
ANSWER : B
Explanation:
Globe valves allow precise flow regulation, making them ideal for throttling.
, 10. Which law explains the relationship between pressure and temperature
of a gas at constant volume?
A. Boyle’s Law
B. Charles’ Law
C. Gay-Lussac’s Law
D. Dalton’s Law
ANSWER : C
Explanation:
Gay-Lussac’s Law states that pressure is directly proportional to temperature at
constant volume.
11. A centrifugal pump should never be started with the discharge valve
fully open because:
A. It may overload the motor
B. It will cavitate
C. It loses suction
D. It increases pressure
ANSWER : A
Explanation:
Starting with the discharge valve open can cause motor overload due to
excessive flow.
12. Which electrical device protects against short circuits?
A. Relay
B. Transformer
C. Circuit breaker
D. Rheostat
ANSWER : C
Explanation:
Circuit breakers automatically interrupt current during overloads or short
circuits.
13. What is the normal purpose of a deaerator?
Grade 1?
A. Performing routine maintenance only
B. Assisting junior engineers
C. Supervising operation of boilers and mechanical systems
D. Cleaning boiler rooms
ANSWER : C
Explanation:
Grade 1 engineers are responsible for supervision, operation, and safety of
high-pressure boilers, chillers, turbines, and auxiliary systems—not just
maintenance.
2. Which device prevents boiler pressure from exceeding safe limits?
A. Pressure gauge
B. Safety valve
C. Feedwater pump
D. Economizer
ANSWER : B
Explanation:
The safety valve automatically relieves excess pressure to prevent explosion.
Pressure gauges only indicate pressure.
3. A sudden drop in boiler water level could indicate:
A. Proper firing
B. Plugged safety valve
,C. Feedwater failure or leak
D. Normal operation
ANSWER : C
Explanation:
Low water conditions are dangerous and often caused by feedwater pump
failure, leaks, or faulty controls.
4. Which fuel produces the highest BTU per pound?
A. Wood
B. Coal
C. Natural gas
D. Fuel oil
ANSWER : D
Explanation:
Fuel oil has a higher heat value per pound compared to coal, gas, or wood.
5. What is the purpose of boiler blowdown?
A. Increase pressure
B. Remove sludge and dissolved solids
C. Improve combustion
D. Add feedwater
ANSWER : B
Explanation:
Blowdown removes sediment and dissolved solids that can cause scaling and
corrosion.
6. Which condition is most dangerous to a boiler?
A. High water level
B. Low water level
C. Normal pressure
D. Slight scale formation
ANSWER : B
,Explanation:
Low water can expose boiler tubes, causing overheating and potential
explosion.
7. What instrument measures boiler draft?
A. Barometer
B. Manometer
C. Ammeter
D. Thermocouple
ANSWER : B
Explanation:
A manometer measures pressure differences, including draft in boilers and
flues.
8. The primary function of an economizer is to:
A. Reduce pressure
B. Increase stack temperature
C. Recover waste heat
D. Remove soot
ANSWER : C
Explanation:
Economizers preheat feedwater using flue gases, improving efficiency.
9. What type of valve is commonly used for throttling flow?
A. Gate valve
B. Globe valve
C. Check valve
D. Safety valve
ANSWER : B
Explanation:
Globe valves allow precise flow regulation, making them ideal for throttling.
, 10. Which law explains the relationship between pressure and temperature
of a gas at constant volume?
A. Boyle’s Law
B. Charles’ Law
C. Gay-Lussac’s Law
D. Dalton’s Law
ANSWER : C
Explanation:
Gay-Lussac’s Law states that pressure is directly proportional to temperature at
constant volume.
11. A centrifugal pump should never be started with the discharge valve
fully open because:
A. It may overload the motor
B. It will cavitate
C. It loses suction
D. It increases pressure
ANSWER : A
Explanation:
Starting with the discharge valve open can cause motor overload due to
excessive flow.
12. Which electrical device protects against short circuits?
A. Relay
B. Transformer
C. Circuit breaker
D. Rheostat
ANSWER : C
Explanation:
Circuit breakers automatically interrupt current during overloads or short
circuits.
13. What is the normal purpose of a deaerator?
