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ABSA 4TH CLASS ACTUAL TEST QUESTIONS AND
ANSWERS 2025/
✔✔Which one of the following fusion welding is a totally manual process? Select one: a. oxy-fuel b. submerged arc c. gas metal arc d. gas tungsten arc - ✔✔a. oxy-fuel ✔✔A sensing element responds to the value of the Select one: a. Controller b. Recorder c. Control valve d. Measured variable - ✔✔d. Measured variable ✔✔Determine the magnitude and direction of resultant of the following concurrent coplanar forces - 10N at 32° east of north, 35N at 50° east of north, 25N at 72° east of north, and 85N at 40° east of south Select one: a. 70N at 56° east of north b. 45N at 44° east of north c. 196N at 87° east of south d. 114N at 77° east of south - ✔✔d. 114N at 77° east of south ✔✔A pressure gauge on a section IV boiler is : Select one: a. Graduated to a maximum setting of double the PRV setting b. Graduated to a maximum setting or double the MAWP c. Graduated to no less than 30 psi (200 kPa), nor more than 60 psi (414 kPa) d. Graduated to between 1.5 and 2 times the PRV setting - ✔✔c. graduated to no less than 30 psi (200 kPa), nor more than 60 psi (414 kPa) ✔✔In a Plant Line Trace sketch: Select one: a. All valves are shown b. only major features are shown c. All process flows are shown d. pipe sizes are shown - ✔✔b. only major features are shown ✔✔Heat that brings about a change of state: Select one: a. Can be sensed by a thermometer b. Is called sensible heat
c. Causes a change of temperature d. Is called latent heat e. Is called specific heat - ✔✔d. Is called latent heat ✔✔Tie breakers are used to: Select one: a. Allow the interconnection of two power sources without placing them in parallel b. Break the circuit in case of overload c. Protect the transformer from the power source d. Protect the plant service bus from the power source - ✔✔a. Allow the interconnection of two power sources without placing them in parallel ✔✔What type of fire should be put out with water? Select one: a. Class "A" b. Class "B" c. Class "C" d. Class "A", "B", and "C" - ✔✔a. Class "A" ✔✔Which one of these statements is true?: Select one: a. The attitude of an injured worker has no impact on the outcome of his injury. b. Financial costs of a workplace injury outweigh all other costs c. A workplace injury can destroy an employee's self esteem d. An injured worker usually causes his own injury. - ✔✔c. A workplace injury can destroy an employee's self esteem ✔✔An unpredicted change in a plant process is called a/an: Select one: a. Disruption b. Disturbance c. Error d. Malfunction - ✔✔b. Disturbance ✔✔The transfer of heat involving the movement of a fluid is defined as: Select one: a. Conduction b. Convection c. Radiation d. Flux e. Thermo-circulation - ✔✔b. Convection ✔✔A simple wheel and axle has a wheel diameter of 2.3m and an axle diameter of 92mm. If an effort of 26N is required to raise a mass of 16kg, what is the efficiency of the machine?
a. Strain b. Stress c. Ultimate strength d. Load - ✔✔b. Stress ✔✔What are the three reservoirs of the carbon cycle? Select one: a. animals, oceans, atmosphere b. rocks, plants, atmosphere c. trees, animals, oceans d. rocks, oceans, atmosphere - ✔✔d. rocks, oceans, atmosphere ✔✔The Hartford Loop prevents the water in the boiler from: Select one: a. Exceeding the maximum temperature b. Exceeding the highest safe level c. Dropping below a safe level d. Flowing out through the steam main - ✔✔c. Dropping below a safe level ✔✔The piping service symbols "A", "G", "O" stand for: Select one: a. Acetylene, gasoline, and oil b. Air, gaseous and oil c. Air, gases and oxygen d. Ammonia, gaseous and octane - ✔✔b. Air, gaseous and oil ✔✔The direction of the _____ due to motor action may be determined using the Left Hand Rule for Motors. Select one: a. Force b. Current c. Resistance d. Rotation - ✔✔a. Force ✔✔To transfer the power to or from the rotor of alternators, ____________ are used. Select one: a. Field poles b. Commutators c. Slip rings d. Hard-wired connections - ✔✔c. Slip rings ✔✔Which analog signal input can a PLC accept? Select one: a. 4-10 mV (AC) b. 0-10mV (DC) c. 4-20 mA
d. 0-10V (AC) - ✔✔c. 4-20 mA ✔✔Which of these is a key component to MMS (maintenance management system)? Select one: a. A maintenance manager b. Work order system c. On call contractors d. Well-stocked toolboxes - ✔✔b. Work order system ✔✔The main purpose of the Boiler and Pressure Vessel Code is: Select one: a. The promotion of efficient combustion b. To protect life and property c. To promote efficient boiler operation d. To promote qualified training for operators - ✔✔b. To protect life and property ✔✔Transformers require: Select one: a. More maintenance than other electric machinery b. Less maintenance than most other electric machinery c. Inspection every three years d. Inspection every month - ✔✔b. Less maintenance than most other electric machinery ✔✔Fin surface area of a heating or cooling coil is called: Select one: a. Primary surface area b. Secondary surface area c. Tube surface area d. Heater surface area e. Radiant heater surface area - ✔✔b. Secondary surface area ✔✔Air is predominantly composed of: Select one: a. O2, CO2 and CH b. O2, N2 and CH c. O2 and N d. O2, CO2 and H2 - ✔✔c. O2 and N ✔✔One of the key components of a maintenance management system is: Select one: a. An inventory program b. Emergency shutdowns c. Ensuring the talk button is not held down d. Keeping the budget a secret, so people don't spend money - ✔✔a. An inventory program
✔✔A train starts off from rest and reaches a velocity of 100km/h in 8 minutes. If the velocity increases uniformly, how far will the train travel during the first 8 minutes? Select one: a. 6.67 km b. 7.43 km c. 8.50 km d. 9.25 km - ✔✔a. 6.67 km ✔✔An open circuit is one in which: Select one: a. A switch is closed b. The wires are bare c. A switch is open d. Voltage may exit - ✔✔c. A switch is open ✔✔When a process variable has no method of sending information to the final control element (a valve for example) the system is known as: Select one: a. An open loop system b. A cascade system c. A feedback system d. A feedforward system - ✔✔a. An open loop system ✔✔Carbon in the atmosphere is a result of human activity and: Select one: a. evolution b. natural processes c. deforestation d. combustion - ✔✔b. natural processes ✔✔A modulating pressure atomizer has its return oil flow regulated by: Select one: a. A modulating valve to the burner b. A firing rate control valve in the return line c. A solenoid valve in the return line d. A pressure regulator - ✔✔b. A firing rate control valve in the return line ✔✔Inlet damper control on a fan: Select one: a. Requires more power to drive the fan when the vanes are closed. b. Requires less power to drive the fan at reduced loads. c. Is only used on forced draft fans. d. Is far less complicated than outlet damper control. - ✔✔b. Requires less power to drive the fan at reduced loads.
✔✔If the boiler efficiency is 84% and 26 880 kJ of heat is supplied to the steam for each kg of fuel burned, what is the heating value of the fuel? Select one: a. 22 579.2 kJ/kg b. 32 000 kJ/kg c. 26 880 kJ/kg d. 54 579.2 kJ/kg e. 36 000 kJ/kg - ✔✔b. 32 000 kJ/kg ✔✔When working with high voltages the following precautions should be observed: Select one: a. access should be locked, allowing only authorized personnel to enter b. remove all grounding straps before proceeding with the work c. only allow workers from the utility to work on the equipment d. make sure the voltages are safe before contacting live conductors - ✔✔a. access should be locked, allowing only authorized personnel to enter ✔✔When the intermittent blowoff valves on a boiler are both seatless, the correct operating sequence is to open the: Select one: a. The valve furthest from the boiler is opened first and closed last b. The valve closest to the boiler is opened first and closed last c. The valve furthest from the boiler is opened first and closed first d. The valve closest to the boiler is opened first and closed first - ✔✔a. The valve furthest from the boiler is opened first and closed last ✔✔In the early days, owners of power plants hired _____ workers, who started out doing manual labour and through acquired experience they were promoted to jobs with gradually increasing levels of skill. Select one: A. Unskilled B. Trained C. Qualified D. Highly educated - ✔✔A. Unskilled ✔✔Industrial stack emissions are: Select one: a. reflective of the type of fuel being burned b. can be eliminated by proper fuel burning equipment c. not a concern of jurisdictions d. predominantly carbon dioxide - ✔✔a. reflective of the type of fuel being burned ✔✔What kind of problems can be detected using the visual method while a weld is taking place? Select one: a. the formation of cracks
b. 50 c. 110 d. 220 - ✔✔a. 30 ✔✔Asbestos is an old insulation material still found in many plants. Asbestos fibres cause health problems because: Select one: a. The fibres lodge in a workers lungs and stay because of hook like barbs on the fibre b. The fibres do not cause the damage, but the dust sitting in the lungs causes a type of pneumonia. c. The dust causes flu like diseases d. The fibres cause scarring for no reason - ✔✔a. The fibres lodge in a workers lungs and stay because of hook like barbs on the fibre ✔✔Radiators can be classified as: Select one: a. Floor, window or ceiling b. Window, duct or floor c. Wall-hung, floor, and window d. Legless, ductless and floor e. Cast iron, steel and copper - ✔✔c. Wall-hung, floor, and window ✔✔What are the welds called which are carried out on the parts of a pressure vessel which directly contains the internal forces generated? Select one: a. pressure containment welds b. pressure mitigation welds c. pressure integrity welds d. pressure boundary welds - ✔✔d. pressure boundary welds ✔✔Immersion boiler tube bundles: Select one: a. Conduct current through the boiler water b. Can be easily removed from the unit for maintenance purposes c. Withstand extremely high temperatures and pressures d. Have negligible electrical resistance - ✔✔b. Can be easily removed from the unit for maintenance purposes ✔✔To register a boiler, pressure vessel, a pressure piping system, or a boiler fitting, within one of the provincial jurisdictions, Select one: a. The chief inspector of the jurisdiction must review and approve the design drawings and calculations b. Drawings must be submitted to the ASME c. The manufacturer need not have a quality control program in place
d. The CSA must approve the design - ✔✔a. The chief inspector of the jurisdiction must review and approve the design drawings and calculations ✔✔A PLC with an HMI can signal an alarm by: (choose all that are correct) Select one or more: a. Flash the equipment icon on the HMI screen b. Turn the HMI screen a different colour c. Sounding a siren or horn d. operating a beacon e. All of the above - ✔✔e. All of the above ✔✔Individual responsibilities for health and safety must be borne by: Select one: a. Management only b. Employees only c. All personnel in a work place d. Owners only - ✔✔c. All personnel in a work place ✔✔Who would be one of the most important reviewers of a new SOP? Select one: a. An operator from that area b. The Author c. The HR manager d. The Chief Power engineer - ✔✔a. An operator from that area ✔✔A simple machine is one that receives energy by means of a single applied force and produces work by means of: Select one: a. Multiple output forces b. An energy form c. Distance moved d. A single output force - ✔✔d. A single output force ✔✔A thermostatic steam trap is controlled by the: Select one: a. Difference in velocity between condensate and steam b. air pressure built up on top of disk c. Temperature difference between condensate and steam d. Bucket, which flips when filled with condensate - ✔✔c. Temperature difference between condensate and steam ✔✔All maintenance on portable fire extinguishers must be: Select one: a. Completed on all extinguishers in the plant at the same time b. Performed at the work site in case they are required for emergency service c. Contracted out to a certified service company
c. Supply and ensure usage of d. Only supply - ✔✔c. Supply and ensure usage of ✔✔The unit of measure for work in the SI system is: Select one: a. Newtons b. Joules c. Kilowatts d. Foot pounds - ✔✔b. Joules ✔✔A hole 3cm in diameter is to be punched out of a steel plate that is 8cm thick. The shear stress of the material is 670 GPa. What force is required on the punch? Select one: a. 4 735 509 GN b. 5051.6 MN c. 1.6 x 1013 N d. 9036 MN - ✔✔b. 5051.6 MN ✔✔Two types of expansion joints are the _________ designs. Select one: a. Bolted and threaded b. Flex bend and raised face c. ring joint and slip d. Bellows and slip - ✔✔d. Bellows and slip ✔✔The advantage of a steel stack over a reinforced concrete stack is that a steel stack: Select one: a. Is more durable b. Requires less maintenance c. Has lower cost d. Has longer life - ✔✔c. Has lower cost ✔✔In comparing the two common communication methods, written communication is more effectively used when: Select one: a. There is less time to prepare b. In emergency situations c. A record of the communication is required d. An immediate response is required - ✔✔c. A record of the communication is required ✔✔A boiler blowoff system is equipped with slow and fast opening valves. The quick opening valve is placed: Select one: a. Closest to the boiler and opened first b. Furthest from the boiler and opened first c. Closest to the boiler and opened last
d. Furthest from the boiler and opened last - ✔✔a. Closest to the boiler and opened first ✔✔If you discover an injured worker in your facility, you should ____________ on your two-way radio. Select one: a. Call emergency services b. Call out "HELP" c. Press the "Man Down" button d. Keep radio silence - ✔✔c. Press the "Man Down" button ✔✔The water flow through a modular cast iron boiler system: Select one: a. Continuous through all modules b. Connected in series c. Intermittent, occurring only while the unit is firing d. Done without the use of headers or manifolds - ✔✔a. Continuous through all modules ✔✔On-off thermostats are equipped with: Select one: a. An open contact switch b. Humidity compensation c. Two or more switches, operated in sequence d. A potentiometer - ✔✔a. An open contact switch ✔✔In a balanced draft system, the forced draft fan is: Select one: a. Larger than the induced draft fan b. Smaller than the induced draft fan c. Designed to handle hot combustion gases d. Used to maintain a slight negative pressure in the furnace - ✔✔b. Smaller than the induced draft fan ✔✔Current flow is: Select one: a. Increases as the applied voltage increases b. Proportional to the resistance c. Unaffected by resistance d. Increases when applied voltage decreases - ✔✔a. Increases as the applied voltage increases ✔✔If a substance goes through a process that changes its composition so that it is no longer the same substance, then the substance has undergone a: Select one: a. Physical change b. Heterogeneous change c. Homogeneous change
a. 40 W b. 0.025 Ω c. 360 Ω d. 40 Ω - ✔✔d. 40 Ω ✔✔Fire pumps usually start automatically with a signal from the: Select one: a. sprinkler head b. water main pressure c. smoke/heat detector d. Fire main pressure - ✔✔d. Fire main pressure ✔✔As compared to a cooler water sample, warmer water: Select one: a. cannot hold as much dissolved oxygen b. is not considered a major pollutant c. has a lower vapour pressure d. is more dense - ✔✔a. cannot hold as much dissolved oxygen ✔✔Vectors that meet at the same point are called: Select one: a. Equal b. Co-directional c. Coplaner d. Concurrent - ✔✔d. Concurrent ✔✔Of these materials, the one most commonly used for sewage piping is Select one: a. stainless steel b. cast steel c. cast iron d. aluminum - ✔✔c. cast iron ✔✔A fire in which of the following constitutes a Class "C" fire: Select one: a. Coal bunker b. Fuel tank c. Lumber pile d. Electrical panel - ✔✔d. Electrical panel ✔✔Utility companies have a surcharge to their customers based on: Select one: a. The maximum amperage used b. System capacitance c. Transformer efficiency
d. Peak power demand - ✔✔d. Peak power demand ✔✔The first pass of a multi-pass weld is known as the: Select one: a. primary pass b. starting pass c. root pass d. integral pass - ✔✔c. root pass ✔✔A weld inspector uses ultraviolet light when performing _________ inspection. Select one: a. Dye penetrant b. Ultrasonic c. Radiographic d. Fluorescent penetrant - ✔✔d. Fluorescent penetrant ✔✔Which of these is not a steam drum internal component? Select one: a. Chemical feed pipe b. Chevron dryer c. Baffle d. Intermittent blow off line - ✔✔d. Intermittent blow off line ✔✔Low pressures and vacuums may be measured: Select one: a. With a transducer b. With a rotameter c. In MPa d. With a manometer - ✔✔d. With a manometer ✔✔Magnetic flux can be said to be: Select one: a. Lines of force within a magnet and flowing N to S b. Lines of force outside a magnet and flowing N to S c. A magnetic field d. Lines of force flowing S to N outside a magnet - ✔✔b. Lines of force outside a magnet and flowing N to S ✔✔The valve design with the greatest capability to handle slurries and fluids with high suspended solids is the __________ valve. Select one: a. Globe b. Gate c. Ball
c. 1280 kN d. 1280 Watts - ✔✔b. 1280 kNm ✔✔A Process Flow Diagram (PFD) includes: Select one: a. A detailed drawing of a plant b. Equipment shown in exact orientation for the process c. A simplified schematic of a portion of the process and the equipment in the process d. Components that are not drawn to scale - ✔✔d. Components that are not drawn to scale ✔✔A pulley with a diameter of 50cm is driven at 960 r/min. What will be the linear speed, in m/s, of a point on the rim of the pulley? Select one: a. 150. b. 50. c. 25. d. 6.3 - ✔✔c. 25. ✔✔One of the advantages of using natural gas as a fuel in a boiler is: Select one: a. No storage space is required b. Low cost c. Abundance in supplies d. No standby fuel is necessary - ✔✔a. No storage space is required ✔✔During a welding inspection, an indication has been found to be "acceptable" when compared to a standard. What is the term given to such an acceptable indication? Select one: a. an error b. a minor defect c. a flaw d. an exclusion - ✔✔c. a flaw ✔✔Two main categories of manufactured steel piping are Select one: a. Seamless and welded b. Welded or screwed c. Piping and tubing d. Pressure and water - ✔✔a. Seamless and welded ✔✔PLC's are commonly used for: Select one: a. limit switch b. Temperature readings
c. Conveyor sequencing d. Boiler safety systems - ✔✔c. Conveyor sequencing ✔✔The two general designs of electric boilers are the: Select one: a. Firetube and watertube b. AC and DC c. Electrode and immersion d. Grounded and ungrounded - ✔✔c. Electrode and immersion ✔✔Stays are not normally required in watertube boilers because: Select one: a. Space does not permit their installation b. They would block access c. The pressure parts have no flat surfaces d. The ASME codes only allow stays in firetube boilers - ✔✔c. The pressure parts have no flat surfaces ✔✔When the temperature of an object is increased, its change in length is proportional to its: Select one: a. Initial length and initial temperature. b. Cross-sectional area and temperature. c. Volume and temperature increase. d. Initial length and temperature increase. e. Initial temperature, but inversely proportional to its length. - ✔✔d. Initial length and temperature increase. ✔✔An example of an extensive property of a substance is: Select one: a. Colour b. Boiling point c. Mass d. Freezing point e. Density - ✔✔c. Mass ✔✔Carbon that is not combined with hydrogen is referred to as: Select one: a. Mono-carbon b. Separated carbon c. Free carbon d. Fixed carbon - ✔✔d. Fixed carbon ✔✔A vector quantity has: Select one: a. Both numerical size and the necessary units of the quantity
