MD STATIONARY ENGINEER EXAM 2026
MECHANICAL EQUIPMENT WORKBOOK
SOLVED QUESTIONS COMPILATION
◉ Which of these should be used on live electrical fires?
A. Class D extinguishers
B. Class C extinguishers
C. Class B extinguishers
D. Class A extinguishers
Answer: B. Class C extinguishers
◉ If certain grades of fuel oil are not preheated properly, they may
cause
A. higher temperatures in the furnace.
B. back pressure and leaks in the fuel lines.
C. poor combustion and high fuel consumption.
D. increased pressure and dangerous levels of steam.
Answer: C. poor combustion and high fuel consumption.
◉ The furnace is almost always in a ___________ pressure.
,Negative
Positive
Answer: Negative
◉ In an open feedwater heater or de-aerating feedwater tank, a
clogged vent line will _______ air/non-condensables in feedwater.
Increase
Decrease
Answer: Increase
◉ Reciprocating pump- rated by diameter of piston. 4x2x4 pump.
The first number is the diameter of the ___________. The second
number is the diameter of the ______. The third number is the length
of ________.
Answer: steam piston, water piston, stroke
◉ Suction valve on reciprocating pump allows water into the ______
and keeps it from backing up into the ______ line. If suction water is
too hot the pump will become steam bound.
Answer: cylinder, suction
◉ Horizontal split case centrifugal pump- center eye of impeller is
________ suction pressure. _________ is the formation and collapse of
, vapor bubbles which will cause vibration and noise. Caused by
__________ water temp or low pressure. Vibration causes damage.
Answer: Lowest, Cavitation, high
◉ Condensate system has ________ vent on top. Condensate is treated
to get rid of ____________.
Answer: atmospheric, carbonic acid
◉ The feedwater regulating valve has a _________ line to get rid of
sludge/sediment
Answer: blowdown
◉ Thermostatic type steam traps are used on ____________
Answer: radiators
◉ Steam traps increase efficiency by removing ___________ and
__________ from the system
Answer: air and condensate
◉ If multiple safeties are on a boiler- the range of their settings
should be _____
Answer: 10
MECHANICAL EQUIPMENT WORKBOOK
SOLVED QUESTIONS COMPILATION
◉ Which of these should be used on live electrical fires?
A. Class D extinguishers
B. Class C extinguishers
C. Class B extinguishers
D. Class A extinguishers
Answer: B. Class C extinguishers
◉ If certain grades of fuel oil are not preheated properly, they may
cause
A. higher temperatures in the furnace.
B. back pressure and leaks in the fuel lines.
C. poor combustion and high fuel consumption.
D. increased pressure and dangerous levels of steam.
Answer: C. poor combustion and high fuel consumption.
◉ The furnace is almost always in a ___________ pressure.
,Negative
Positive
Answer: Negative
◉ In an open feedwater heater or de-aerating feedwater tank, a
clogged vent line will _______ air/non-condensables in feedwater.
Increase
Decrease
Answer: Increase
◉ Reciprocating pump- rated by diameter of piston. 4x2x4 pump.
The first number is the diameter of the ___________. The second
number is the diameter of the ______. The third number is the length
of ________.
Answer: steam piston, water piston, stroke
◉ Suction valve on reciprocating pump allows water into the ______
and keeps it from backing up into the ______ line. If suction water is
too hot the pump will become steam bound.
Answer: cylinder, suction
◉ Horizontal split case centrifugal pump- center eye of impeller is
________ suction pressure. _________ is the formation and collapse of
, vapor bubbles which will cause vibration and noise. Caused by
__________ water temp or low pressure. Vibration causes damage.
Answer: Lowest, Cavitation, high
◉ Condensate system has ________ vent on top. Condensate is treated
to get rid of ____________.
Answer: atmospheric, carbonic acid
◉ The feedwater regulating valve has a _________ line to get rid of
sludge/sediment
Answer: blowdown
◉ Thermostatic type steam traps are used on ____________
Answer: radiators
◉ Steam traps increase efficiency by removing ___________ and
__________ from the system
Answer: air and condensate
◉ If multiple safeties are on a boiler- the range of their settings
should be _____
Answer: 10
