ABSA: 4th Class Part B -
Comprehensive Exam 2 Questions And
Answers
What must be located outside a Class T machinery room?
Select one:
a. Spare flashlights
b. Disposable coveralls
c. Machinery shut off switch
d. Light switches - correct answer ✅c
Degradation of heat transfer fluid of a hot oil system will begin to
occur if:
Select one:
a. The oil filter is not serviced regularly
b. The oil temperature is above a specified range, for an extended
period of time
c. The oil is allowed to churn in the circulating pump
d. The oil becomes too viscous - correct answer ✅b
Dry and flooded evaporators differ primarily in what respect?
Select one:
,ABSA: 4th Class Part B -
Comprehensive Exam 2 Questions And
Answers
a. Dry evaporators use low-side floats, whereas flooded evaporators
use high-side floats
b. Flooded systems primarily use Group B1 and B2 refrigerants
c. The heat transfer surfaces of a flooded evaporator are kept
covered with liquid refrigerant
d. The dry evaporator is designed to cool gases only - correct
answer ✅c
It is good design practice to select a steam coil size so that:
Select one:
a. At least 10% of the coil capacity is needed when the air
temperature at the coil inlet is €"5°C
b. At least 80% of the coil capacity is needed when the air
temperature at the coil inlet is €"1°C
c. At least 40% of the coil capacity is needed when the air
temperature entering the coil is €"1°C
d. 100% of the coil capacity is needed when the air temperature
entering the coil is €"1°C - correct answer ✅c
,ABSA: 4th Class Part B -
Comprehensive Exam 2 Questions And
Answers
The final step when replacing a firetube is:
Select one:
a. Re-expansion
b. Hydrostatic test
c. Seal welding
d. Annealing the tube ends - correct answer ✅b
If a boiler sustains a low water condition
Select one:
a. open the safety valve or drum vent valve to release pressure.
b. use cool feedwater to quench any overheated heating surface.
c. shut down the burner, let the boiler cool slowly, then drain and
inspect it for damage due to overheating.
d. immediately feed water into the boiler to raise the level. - correct
answer ✅c
An advantage of a pump using a mechanical seal is:
Select one:
, ABSA: 4th Class Part B -
Comprehensive Exam 2 Questions And
Answers
a. Ease of repair
b. Less lubrication
c. Less maintenance
d. Lower first cost - correct answer ✅c
For economical operation, the steam supply to a steam engine is
cut off once the piston has traveled _______ of its stroke.
Select one:
a. 1
b. 75% to 90%
c. 1/2 to 5/8
d. 1/4 to 1/3 - correct answer ✅d
A high stack temperature in a hot oil heater may indicate:
Select one:
a. Inadequate combustion air
Comprehensive Exam 2 Questions And
Answers
What must be located outside a Class T machinery room?
Select one:
a. Spare flashlights
b. Disposable coveralls
c. Machinery shut off switch
d. Light switches - correct answer ✅c
Degradation of heat transfer fluid of a hot oil system will begin to
occur if:
Select one:
a. The oil filter is not serviced regularly
b. The oil temperature is above a specified range, for an extended
period of time
c. The oil is allowed to churn in the circulating pump
d. The oil becomes too viscous - correct answer ✅b
Dry and flooded evaporators differ primarily in what respect?
Select one:
,ABSA: 4th Class Part B -
Comprehensive Exam 2 Questions And
Answers
a. Dry evaporators use low-side floats, whereas flooded evaporators
use high-side floats
b. Flooded systems primarily use Group B1 and B2 refrigerants
c. The heat transfer surfaces of a flooded evaporator are kept
covered with liquid refrigerant
d. The dry evaporator is designed to cool gases only - correct
answer ✅c
It is good design practice to select a steam coil size so that:
Select one:
a. At least 10% of the coil capacity is needed when the air
temperature at the coil inlet is €"5°C
b. At least 80% of the coil capacity is needed when the air
temperature at the coil inlet is €"1°C
c. At least 40% of the coil capacity is needed when the air
temperature entering the coil is €"1°C
d. 100% of the coil capacity is needed when the air temperature
entering the coil is €"1°C - correct answer ✅c
,ABSA: 4th Class Part B -
Comprehensive Exam 2 Questions And
Answers
The final step when replacing a firetube is:
Select one:
a. Re-expansion
b. Hydrostatic test
c. Seal welding
d. Annealing the tube ends - correct answer ✅b
If a boiler sustains a low water condition
Select one:
a. open the safety valve or drum vent valve to release pressure.
b. use cool feedwater to quench any overheated heating surface.
c. shut down the burner, let the boiler cool slowly, then drain and
inspect it for damage due to overheating.
d. immediately feed water into the boiler to raise the level. - correct
answer ✅c
An advantage of a pump using a mechanical seal is:
Select one:
, ABSA: 4th Class Part B -
Comprehensive Exam 2 Questions And
Answers
a. Ease of repair
b. Less lubrication
c. Less maintenance
d. Lower first cost - correct answer ✅c
For economical operation, the steam supply to a steam engine is
cut off once the piston has traveled _______ of its stroke.
Select one:
a. 1
b. 75% to 90%
c. 1/2 to 5/8
d. 1/4 to 1/3 - correct answer ✅d
A high stack temperature in a hot oil heater may indicate:
Select one:
a. Inadequate combustion air
