Download ABSA 4th Class Part B Comprehensive Exam Practice Questions (PDF) | 2026 Power Engineering and more Exams Engineering in PDF only on Docsity!
VERIFIED QUESTIONS WITH CORRECT ANSWERS
- One of the legal responsibilities of the engineer during an inspection is: Select one:
a. To notify the Workers Compensation Board of the inspection b. Point out any known or suspected defects to the inspector c. To have at least two staff members present at all times d. To be in possession of an inspection certificate: b
- The tubes of a fired hot oil heater have fins on their outer surfaces. Select one:
a. Water b. Radiant c. Extended type d. Fire: c
- The injection pump of a diesel engine is driven by: Select one:
a. A camshaft b. The governor c. The gudgeon pin d. Piston action: a
- Ammonia, as well as being toxic, is also: Select one:
a. A low pressure refrigerant b. Flammable
VERIFIED QUESTIONS WITH CORRECT ANSWERS
c. Miscible with oil d. Odourless: b
- When a boiler primes, it means that: Select one:
a. The steam vent is open, to allow it to fill b. Water is being carried over with the steam
VERIFIED QUESTIONS WITH CORRECT ANSWERS
a. The building occupancy class b. The activity of the people c. The number of people d. The age of the people: b
- Testing a safety valve on a boiler by pulling the try-lever Select one:
VERIFIED QUESTIONS WITH CORRECT ANSWERS
a. Ensures the valve is free to operate b. Takes approximately two seconds c. Ensures the closing pressure is correct d. Ensures the popping pressure is correct: a
- The is a type of unitary air conditioning system that uses a di- rect expansion refrigeration system to provide cooling and dehumidification, without using ductwork. Select one:
a. Rooftop unit b. Window air conditioner c. Multi-zone system d. Unit ventilator: b
- The property of oil that indicates its ability to support a load is: Select one:
a. Viscosity b. Viscosity index c. Pour point d. Floc point: a
- The inner walls and floor of a fired heater furnace are lined with: Select one:
a. Ceramic tile b. Refractory c. Asbestos blocks
VERIFIED QUESTIONS WITH CORRECT ANSWERS
c. Is an anti-friction type bearing d. Can support more load than a Michell thrust bearing: a
- With regard to hot oil leaving the heater, the operating parameter of par- ticular importance is the oil: Select one:
a. Viscosity b. Temperature c. Velocity d. Pressure: b
- Buildings require heat sources to: Select one:
a. Offset the building's heat losses b. Replace the exhaust air c. Replace the ventilation air d. Offset the heat gain from the atmosphere: a
- Grooving and general thinning of the condensate return system is a result of: Select one:
a. scale build-up b. high alkalinity c. oxygencorrosion d. carbonic acid corrosion: d
- Freezing problems in steam coils with long tube lengths, when heating
VERIFIED QUESTIONS WITH CORRECT ANSWERS
large amounts of low temperature outside air, can be minimized using Select one:
a. An over-sized steam flow control valve. b. A controller that fully closes the outside air dampers when the outside air temperature drops to below freezing.
VERIFIED QUESTIONS WITH CORRECT ANSWERS
heat from a central source to other vessels and heating coils in a plant. Select one:
a. Hot oil b. Condensing
VERIFIED QUESTIONS WITH CORRECT ANSWERS
c. Closed d. Low temperature heating: a
- For a wet layup, what is the recommended boiler water sodium sulfite residual? Select one:
a. 10 ppm b. 40 ppm c. 50 to 80 ppm d. 200 ppm: d
- What is the simplest way to stop sewer gas from coming out of floor drains? Select one:
a. Install a drain plug b. Cover the drain opening c. Have a plumber auger the vent pipe d. Pour a pail of water into the drain: d
- A circulating pump, known as a cooling water pump, is usually: Select one:
a. A small capacity pump b. A once-through device c. A reciprocating pump d. Connected with some type of heat exchanger system: d
- Workers should not work any higher than steps from the top of an extension ladder.
VERIFIED QUESTIONS WITH CORRECT ANSWERS
- Some trees, such as pines, Douglas fir, and tamarack, cannot be successfully made into pulp by the process. Select one:
a. Sulfite b. Sulfate c. Kraft d. Mechanical: a
- Prior to a boiler safety valve popping during routine boiler operation: Select one:
a. A try lever test should be performed b. The pressure gage should be checked c. The high pressure cut-off should open d. The high level alarm should sound: c
- Where gear teeth inter-mesh a lubricant must provide Select one:
a. Corrosion prevention b. Sealing c. Shock absorption d. Temperature control: c
- ASME CSD-1 recommends that flame rods and scanners be replaced Select one:
a. before problems occur.
VERIFIED QUESTIONS WITH CORRECT ANSWERS
b. monthly c. after 5000 hours of operation d. annually: d
- The convection tubes of a horizontal direct-fired hot oil heater are found Select one:
a. embedded in the refractory lining
VERIFIED QUESTIONS WITH CORRECT ANSWERS
pressure section containing the head pressure and a low pressure section carrying the pressure: Select one:
a. Suction b. Saturation
VERIFIED QUESTIONS WITH CORRECT ANSWERS
c. Absolute d. Discharge: a
- A scaffold should always be erected: Select one:
a. plumb and level b. by a safety contractor c. three feet above the work area d. when the available stepladder would require standing on the top step: a
- A gas turbine is most efficient when: Select one:
a. operated at the highest combustion temperature that the construction materials permit. b. the ambient air temperature is low c. the combustion chamber is kept cool d. both turbine shafts run at the same speed: a
- On a boiler fuel system that has a double block and bleed arrangement: Select one:
a. The main SSOVs and the vent valves open at the same time. b. The main SSOVs open before the pre-purge occurs c. The main SSOVs energize when the bleed valve de-energizes. d. The bleed valve is a normally open solenoid valve.: d
- A packaged steam boiler modulating combustion control system will rou- tinely:
VERIFIED QUESTIONS WITH CORRECT ANSWERS
- When an automatic unattended boiler starts up, the programming control will first: Select one:
a. Energize the main gas valve b. Start the forced draft fan c. Start the post purge period d. Energize the ignition transformer and pilot gas solenoid valve: b
- One purpose of the small valve on top of the shell of most boilers, which is not required by code, is to: Select one:
a. allow air into the boiler when the boiler is being filled with water. b. allow air to escape from the boiler when the boiler is being filled with water. c. allow water to escape before the steam stop valve is opened during the warm-up period. d. allow water into the boiler when the boiler is being drained or cooled preventing the formation of a vacuum.: b
- The area around a pump shaft, where packing material is placed to reduce leakage past the shaft, is known as a: Select one:
a. Wearing ring b. Stuffing box c. Seal cage d. Seal box: b
VERIFIED QUESTIONS WITH CORRECT ANSWERS
- Rotary pumps should be started with the discharge valve open because they are pumps. Select one:
a. Regenerative b. Positive displacement
