ABSA: 4TH CLASS PART B - COMPREHENSIVE EXAM 2|
2025/2026 WITH COMPLETE SOLUTION NEWEST 100%
PASS
1. 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 ANS >> c
2. Degradation of heat transfer fluid of a hot oil system will begin to occur if
CORRECT ANS >> Select one CORRECT ANS >>
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 ANS >> b
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, 3. Dry and flooded evaporators differ primarily in what respect?
Select one
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 ANS >> c
4. It is good design practice to select a steam coil size so that
Select one CORRECT ANS >>
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
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, the coil is €"1°C
d. 100% of the coil capacity is needed when the air temperature entering the
coil is €"1°C CORRECT ANS >> c
5. The final step when replacing a firetube is CORRECT ANS >>
Select one CORRECT ANS >>
a. Re-expansion
b. Hydrostatic test
c. Seal welding
d. Annealing the tube ends CORRECT ANS >> b
6. If a boiler sustains a low water condition
Select one CORRECT ANS >>
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 ANS >> c
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, 7. An advantage of a pump using a mechanical seal is CORRECT ANS >>
Select one CORRECT ANS >>
a. Ease of repair
b. Less lubrication
c. Less maintenance
d. Lower first cost CORRECT ANS >> c
8. For economical operation, the steam supply to a steam engine is cut off once
the piston has traveled of its stroke.
Select one CORRECT ANS >>
a. 1
b. 75% to 90%
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2025/2026 WITH COMPLETE SOLUTION NEWEST 100%
PASS
1. 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 ANS >> c
2. Degradation of heat transfer fluid of a hot oil system will begin to occur if
CORRECT ANS >> Select one CORRECT ANS >>
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 ANS >> b
https://www.stuvia.com/user/MBoffin
, 3. Dry and flooded evaporators differ primarily in what respect?
Select one
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 ANS >> c
4. It is good design practice to select a steam coil size so that
Select one CORRECT ANS >>
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
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, the coil is €"1°C
d. 100% of the coil capacity is needed when the air temperature entering the
coil is €"1°C CORRECT ANS >> c
5. The final step when replacing a firetube is CORRECT ANS >>
Select one CORRECT ANS >>
a. Re-expansion
b. Hydrostatic test
c. Seal welding
d. Annealing the tube ends CORRECT ANS >> b
6. If a boiler sustains a low water condition
Select one CORRECT ANS >>
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 ANS >> c
https://www.stuvia.com/user/MBoffin
, 7. An advantage of a pump using a mechanical seal is CORRECT ANS >>
Select one CORRECT ANS >>
a. Ease of repair
b. Less lubrication
c. Less maintenance
d. Lower first cost CORRECT ANS >> c
8. For economical operation, the steam supply to a steam engine is cut off once
the piston has traveled of its stroke.
Select one CORRECT ANS >>
a. 1
b. 75% to 90%
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