ABSA: 4th Class Part B - Comprehensive Exam 3
questions with verified answers
_____ are installed to prevent hot oil from spreading beyond the
confines of a hot oil heater in the event of a ruptured tube.
Select one:
a. By-pass pipes
b. Ditches
c. Tunnels
d. Dikes Ans✓✓✓ d
___________ dampers are controlled in such a way that they are either
fully open or fully closed.
Select one:
a. Relief
b. Backdraft
c. Return air
d. Two-position Ans✓✓✓ d
_______________ causes the fuel to ignite in a diesel engine.
Select one:
a. A precisely timed glow plug.
,b. The fuel injector nozzle.
c. The high temperature compressed air in the engine cylinder.
d. The pressure of the injected fuel. Ans✓✓✓ c
A buried ventilation duct in an older building draws air from a chemistry
lab fume hood. The duct would likely be constructed of
Select one:
a. Fiberglass
b. Cement asbestos
c. Aluminum sheet metal
d. Galvanized steel sheet metal Ans✓✓✓ b
A common cause of antifriction bearing failure is:
Select one:
a. Shaft misalignment
b. Drive motor overload
c. Extreme cold temperature cracking
d. High RPM service Ans✓✓✓ a
A common complaint about fan coil units with make-up air is:
Select one:
,a. The fan noise is excessive.
b. The system requires too much maintenance.
c. The unit must be shut off when the room is unoccupied.
d. The response is very slow when the system is first turned on.
Ans✓✓✓ a
A common plumbing trap has a water seal depth of:
Select one:
a. The inside diameter of the pipe
b. The outside diameter of the pipe
c. 5 cm
d. 10 cm Ans✓✓✓ c
A common way to determine the mass of an object to be hoisted is by
determining its
Select one:
a. Specific gravity and centripetal force
b. center of gravity
c. Size and shape
d. Density and volume Ans✓✓✓ d
, A control room operator notices that the stack temperature of a hot oil
heater is increasing rapidly. The operator should:
Select one:
a. Wait to see if the temperature returns to normal.
b. Send an operator out to see if there is smoke coming from the oil
heater stack.
c. Call the shift charge engineer for advice.
d. Activate the emergency shutdown. Ans✓✓✓ d
A counter-flow cooling tower _____________ than a crossflow cooling
tower.
Select one:
a. requires less fan power
b. has a lower pressure drop
c. is shorter
d. requires less floor space Ans✓✓✓ d
A feedwater pipe, where connected to a power boiler, must have:
Select one:
a. A quick and slow opening stop valve
b. A stop valve only
questions with verified answers
_____ are installed to prevent hot oil from spreading beyond the
confines of a hot oil heater in the event of a ruptured tube.
Select one:
a. By-pass pipes
b. Ditches
c. Tunnels
d. Dikes Ans✓✓✓ d
___________ dampers are controlled in such a way that they are either
fully open or fully closed.
Select one:
a. Relief
b. Backdraft
c. Return air
d. Two-position Ans✓✓✓ d
_______________ causes the fuel to ignite in a diesel engine.
Select one:
a. A precisely timed glow plug.
,b. The fuel injector nozzle.
c. The high temperature compressed air in the engine cylinder.
d. The pressure of the injected fuel. Ans✓✓✓ c
A buried ventilation duct in an older building draws air from a chemistry
lab fume hood. The duct would likely be constructed of
Select one:
a. Fiberglass
b. Cement asbestos
c. Aluminum sheet metal
d. Galvanized steel sheet metal Ans✓✓✓ b
A common cause of antifriction bearing failure is:
Select one:
a. Shaft misalignment
b. Drive motor overload
c. Extreme cold temperature cracking
d. High RPM service Ans✓✓✓ a
A common complaint about fan coil units with make-up air is:
Select one:
,a. The fan noise is excessive.
b. The system requires too much maintenance.
c. The unit must be shut off when the room is unoccupied.
d. The response is very slow when the system is first turned on.
Ans✓✓✓ a
A common plumbing trap has a water seal depth of:
Select one:
a. The inside diameter of the pipe
b. The outside diameter of the pipe
c. 5 cm
d. 10 cm Ans✓✓✓ c
A common way to determine the mass of an object to be hoisted is by
determining its
Select one:
a. Specific gravity and centripetal force
b. center of gravity
c. Size and shape
d. Density and volume Ans✓✓✓ d
, A control room operator notices that the stack temperature of a hot oil
heater is increasing rapidly. The operator should:
Select one:
a. Wait to see if the temperature returns to normal.
b. Send an operator out to see if there is smoke coming from the oil
heater stack.
c. Call the shift charge engineer for advice.
d. Activate the emergency shutdown. Ans✓✓✓ d
A counter-flow cooling tower _____________ than a crossflow cooling
tower.
Select one:
a. requires less fan power
b. has a lower pressure drop
c. is shorter
d. requires less floor space Ans✓✓✓ d
A feedwater pipe, where connected to a power boiler, must have:
Select one:
a. A quick and slow opening stop valve
b. A stop valve only
