ABSA Part A Practice Test Exam Questions And Answers 2025, Exams of Engineering

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Questions And Answers 2025

Which reference to scalars and vectors, a space diagram: a. Illustrates the position of the planets and the stars b. illustrates a system of vectors c. shows the relationship of the scalars to the vector d. illustrates a system of scalars e. shows the relationship of time to the vector - correct answer ✅B The flow of heat from molecule to molecule within a substance or from molecule of one body to those of another body in direct contact with it is defined as: a. Conduction b. Convection c. Specific heat d. Latent heat of fusion e. Absolute pressure - correct answer ✅A Water is the best extinguisher for: A. An oil fire B. A gas fire C. An electrical fire

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D. A wood fire E. A metal burning fire - correct answer ✅D The coefficient of friction is defined as: A. the downward force on the two services in contact B. The force parallel to the surface required to start an object moving C. The reaction normal perpendicular to the surface D. The force parallel to the service required to keep an object moving at a constant linear velocity E. The ratio of the force required to move up body to the - correct answer ✅E To start a body moving which of the following must be overcome? A. Kinetic friction B. Static friction C. Fluid friction D. Rolling friction E. Normal force - correct answer ✅B

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Foam extinguishers are recommended for? A. Class A and Class C fires B. Class C and Class B fires C. Class A and Class B fires D. All classes of fires E. All but burning liquids - correct answer ✅C A control loop controller A. period does not require a set point value B. Sends a signal to a primary element C. Will always eliminate deviation D. Constantly compares input signals to the setpoint E. Send signal to the transmitter - correct answer ✅D The ratio between the ultimate strength and the allowable stress is defined as A.Ultimate stress B. Maximum allowable load

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C. Working stress D. Factor of safety E. Elastic limit - correct answer ✅D Which of the following constitutes a Class C fire? A. Fire in an electrical panel B. Fire in a fuel tank C. Fire in a lumber pile D. Fire in a coal bunker E. Fire in a pile of paper - correct answer ✅A The greatest load that can be applied to a material under is design conditions is called A. Ultimate stress B. Elastic limit C. Allowable stress D. Factor of safety E. Maximum allowable load - correct answer ✅E

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External tensile forces acting parallel but not in line produces: A. Tensile stress B. Compressive stress C. Working stress D. Shear stress E. Compressive strain - correct answer ✅D If an object is in motion along a fractional surface in a certain direction what will be the direction of frictional force exerted on that object? A. Same B. Opposite C. Perpendicular D. Angular with E. Angular against - correct answer ✅B Stepper motors have/are: A. Very high speed operation

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B. Minimum torque when at standstill C. Low reliability D. Slow starting E. Low efficiency - correct answer ✅E ____________are pieces of slag or tungsten that are trapped in a weld deposit A. Porosity B. Undercut C. Incomplete fusion D. Incomplete penetration E. Inclusions - correct answer ✅E NDIR Detectors detect: A. CO/CO B. SO C. NOx D. Relative humidity

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E. CH4 -

correct answer ✅A Brass is an alloy of A.Copper and bronze B.Copper and lead C. Brass and lead D. Copper and tin E. Copper and zinc - correct answer ✅E The area under a velocity vs. time graph equal: a. Distance b. Speed c. Acceleration d. Displacement e. Average velocity - correct answer ✅D A single vector which can replace a system of actors and has the same effect is called a

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a complainer vector b resultant c concurrent factor D scholar E concentric vector - correct answer ✅B Which of the following is an advantage of gear drives over belt drives? a overall drive length can be longer b there is no slippage c. gear drives require minimal maintenance d. gear drives are more versatile e. gear drives requires no maintenance - correct answer ✅B In a Venturi tube blank or more of the upstream pressure is recovered down stream A.80% B. 90% C. 70%

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D. 100%

E. 60% -

correct answer ✅B Ammeters are connected with the negative or black lead connected to the? A. positive side of the circuit B. north pole of the circuit C. Negative side of the circuit D. Switch of the circuit E. Neutral side of the circuit - correct answer ✅C Any substance which cannot be broken down into other substances or ingredients by chemical means is? A. A mixture B. A compound C. An electron D. An atom E. An element - correct answer ✅E

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The periodic table A. Arranges elements in equal numbers of columns and rows B. Arranges elements in descending order of atomic number C. Reflects the similar chemical properties of some elements D. Has 16 distinct groups E. Provides no information besides the chemical symbol of the element - correct answer ✅C All maintenance work done on portable fire extinguishers is required to be: A. Completed on all extinguishers in the plant at the same time B. Performed at the worksite in case they are required for emergency service C. Contracted out to a certified service company D. Supervised by national fire protection Association employee E. Performed on an as needed basis - correct answer ✅C The basic unit of thermal dynamic temperature in the S I system is?

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A. Metre B. Kilograms C. Celsius D. Ampere E. Calvin - correct answer ✅E The oldest form of welding is? A. Forge welding B. Resistance welding C. Spot welding D. Electric arc welding E. Plasma arc welding - correct answer ✅A Which of the following is not a scaler quantity? A. Velocity B. Length C. Volume D. Time

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E. Area - correct answer ✅A A fourth class engineers certificate of competency qualifies the holder to take charge of a power plant as an assistant shift engineer not exceeding A. 1000 kW B. 10 MW C. 10,000 W D. 1500 kW E. 5000 kW - correct answer ✅B Brazing is done at a temperature A. Below 450°C B. Above 450°C C. Above 900°C D. Above 1000°C E. Above 1650°C - correct answer ✅B

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A supplier label can... A. Have a solid border at certain times B. Be replaced by a workplace label C. Show no more than three symbols D. Be removed at any time E. Never be rectangular - correct answer ✅B Soldering is done at temperatures... A. Above 450°C B. Below 450°C C. Above 500°C D. Below 650°C E. Below 1650°C - correct answer ✅B The material safety data sheet is supplied by the A. Occupational health and safety committee B. Plant supervisor C. Federal government D. Supplier of the controlled product

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E. Person using the controlled product - correct answer ✅D A controlled product may enter the body by ingestion inhalation A. through an air B. Through the skin C. Tracked sensation D. Synergistically E. Through dead cells such as hair, nails, etc. - correct answer ✅B Oxygen and acetylene cylinders should be stored A. In a warm dry place B. Together whenever possible C. Inside the building next to the consuming equipment D. At least 6 m apart E. At least 3 m apart - correct answer ✅D Halogen agents are A. Safe until they make contact with the combustion process

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B. Themselves toxic C. The most highly recommended for class B and class C use D. Able to maintain cylinder pressure themselves regardless of temperature E. Gradually replacing dry powder units - correct answer ✅B A proper employee/worker training program is best demonstrated A. Passing NOHS exam with a min of 60% B. Successful completion of a company program. C. Proof of the workers ability to work safely and understand procedures regarding control products and systems D. A record of the workers absentee and number of incident reports E. Random testing of procedures - correct answer ✅C Gas cylinders should be stored upright in order to. A. Minimize space requirements B. Avoid liquified product from escaping C. Keep them from rolling during transportation D. Lessen the chance of a back injury during movement

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E. Enhance proper identification - correct answer ✅B A fully charged oxygen cylinder has a pressure of about A. 10, 000 kPa B. 15,000 kPa C. 20,000 kPa D. 25,000 kPa E. 5000 kPa - correct answer ✅B What is a characteristic of a series wound generator? A. Output voltage rises sharply from minimum load to full load B. Load decreases as field strength increases C. Rising output voltage vs load D. Decreasing output voltage vs load E. Input current remains the same - correct answer ✅A A hydrostatic test of sprinklers and stand pipes may be done every 3 to 5 years depending on

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A. structural integrity B. Local codes C. Manpower available D. Location E. Their performance - correct answer ✅D Which statement concerning belt trains is false A. Belt trains are used to change speeds of pulleys B. Belt trains are used to change power transmission of belts C. Belt trains transmit less power than gear trains of comparable size D. Pulleys in a train all rotate in the same direction E. Trains are connected by a single belt - correct answer ✅E Sulphur oxide's in fluegas are undesirable because they? A. Use up the sulphur in the fuel be. B. Indicator of incomplete combustion in the furnace C. Combine with sunlight to produce smog D. Contribute to acid rain here.

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E. Reduce combustion efficiency - correct answer ✅D I device for measuring flue gas emissions is called A. A dead weight tester B. A calorimeter C. A stock analyzer D. A level metre E. Continuous metering device - correct answer ✅C Acetylene hose connections have A. left hand threads B. Right hand threads C. No threads D. Slip on connections E. Quick couplers - correct answer ✅A With straight polarity: A. AC or DC power may be supplied to the electrode

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B. DC power supply to the electrode C. AC power is supplied to the electrode D. The welding electrode is connected to the positive terminal E. The welding electrode is connected to the negative terminal - correct answer ✅E With reversed polarity A. The welding electrode is connected to the negative terminal B. The welding electrode is connected to the positive terminal C. AC power is supply to the electrode D. DC power is supply to the electrode E. AC or DC power may be supplied to the electrode - correct answer ✅B Nitrogen oxides in fluegas may be reduced by A. Employing a dilute sulphuric acid scrubbing system B. Decreasing the size of the furnace C. Scrubbing the flu gas with lime D. Reducing the percentage of excess air E. Raising the furnace temperature - correct answer ✅D

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Destructive testing of the world means A. Destruction of one complete weld of a structure or vessel B. Destruction of the complete vessel after construction C. Raising hydrostatic pressure on a vessel to the point of rapture D. Mechanical testing of a sample or small portion of a weld E. Thermal shocking a vessel to the point of fracture - correct answer ✅D Noise sources over what level are potentially hazardous to hearing A. 100 dB in above B. 60 dB and above C. 120 dB and above D. 80 dB and above E. 40 dB and above - correct answer ✅A Saturated seen steam is? A. Steam saturated with moisture B. Steam at saturation temperature C. Steam that is neither wet nor dry

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D. Contains more than 50% moisture E. Required for all superheaters - correct answer ✅B Whose responsibility is it to ensure that an emergency plan is in place to deal with incidents where injuries may occur? A. Safety committee B. OH&S committee C. Employee D. Employer E. Boiler inspector - correct answer ✅D Mechanical centre fugal collectors are not suitable for the collection of A. Very coarse particles B. Coarse particles C. Fine particles D. Rough particles E. Heavy particles - correct answer ✅C

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Modulating thermostat is equipped with a A. Piezoelectric device B. Solenoid relay C Potentiometer D. Thermistor E. Receiver - correct answer ✅C The voltage applied to an electrostatic precipitator is between A. 10,000 volts AC & 1,000,000 volts AC B. 1000,000 volts AC & 1,000,000,000 volts AC C. 10,000 volts DC & 100,000 volts DC D. 100,000 volts DC & 1,000,000,000 volts AC E. 100,000 volts AC & 10,000 volts DC - correct answer ✅C A hydrostatic test is required on most fire extinguishers every A. year B.Two years C. Three years D. Four years

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E. Five years - correct answer ✅E When calculations are made with respect to the application of the act 10 kW is equal to A. 0.5 m² of heating service B. 2 m² of heating service C. 10 m² of heating service D. 5 m² of heating service E.. 1 m² of heating service - correct answer ✅E Sprinklers used in a deluge system. A. Have the same design as those used in other systems B. Have larger sizes in those used in other systems C. Have smaller sizes than those used in other systems D. Have their operating elements removed E. Are globe valves - correct answer ✅D When using radiographic inspections defect such as crafts and porosity show up as?

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A. Lighter shadows on the photographic paper B. Wave signals on a small screen C. Darker shadows on the photographic paper D. Darker shadows on a penetrameter E. Lighter shadows on a penetrameter - correct answer ✅C Cooling towers A. Remove sensible heat only from condensate B. Prevent thermal pollution of rivers and lakes C. Cannot be used during winter. D. I'll have fans E. Are mandatory for all power plants - correct answer ✅B Fly ash is removed from bag filters by a system of A. Rollers B. Hammers C. Electrostatic precipitators D. Pinners

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E. Rappers - correct answer ✅E Solder connections are usually used on A. Steel lines B. Copper lines C. Aluminum lines D. Cast iron E. Stainless steel - correct answer ✅B __________valve is used as a final control elements in air or large water piping system A.,Needle valve B. Butterfly valve C. Gate valve D. Globe valve E. Ball valve - correct answer ✅B