Podcast
Questions and Answers
What is the primary function of a piston in an internal combustion engine?
What is the primary function of a piston in an internal combustion engine?
- To compress and transfer combustion gases (correct)
- To produce electrical energy
- To regulate engine temperature
- To supply fuel to the engine
Which of the following best describes a spark ignition engine?
Which of the following best describes a spark ignition engine?
- An engine that uses a diesel fuel mixture
- An engine that relies on compression for ignition
- An engine that uses an external ignition source
- An engine that ignites fuel with a spark plug (correct)
Which part of an engine connects the piston to the crankshaft?
Which part of an engine connects the piston to the crankshaft?
- Connection rod (correct)
- Flywheel
- Camshaft
- Crankcase
What is NOT a function of a crankshaft?
What is NOT a function of a crankshaft?
Which component is responsible for sealing the combustion chamber in an internal combustion engine?
Which component is responsible for sealing the combustion chamber in an internal combustion engine?
What role does the Occupational Health and Safety Act, 1993, emphasize for employers?
What role does the Occupational Health and Safety Act, 1993, emphasize for employers?
Which of the following statements about smoking in the workshop is true?
Which of the following statements about smoking in the workshop is true?
Which statement correctly describes a function of a piston?
Which statement correctly describes a function of a piston?
Which mixture is formed by combining stone, sand, cement, and water that hardens over time?
Which mixture is formed by combining stone, sand, cement, and water that hardens over time?
What type of bricks do not require plastering?
What type of bricks do not require plastering?
Which method is used to set out the foundation digging?
Which method is used to set out the foundation digging?
What are the dimensions in millimeters for a standard concrete footing?
What are the dimensions in millimeters for a standard concrete footing?
What equipment must be used to finish off mortar joints to prevent water seepage?
What equipment must be used to finish off mortar joints to prevent water seepage?
What is the total power consumption of the electrical motor in kW?
What is the total power consumption of the electrical motor in kW?
Which of the following statements regarding external plastering is true?
Which of the following statements regarding external plastering is true?
What is the total operational cost of the pump per month?
What is the total operational cost of the pump per month?
Where are door frames placed during construction?
Where are door frames placed during construction?
How many metres on the ground will 200 mm on the drawing represent at a scale of 1:100?
How many metres on the ground will 200 mm on the drawing represent at a scale of 1:100?
What tool is used to scoop up and spread mortar over the brick course?
What tool is used to scoop up and spread mortar over the brick course?
How many millimetres on the drawing will 15 meters represent on the ground at a scale of 1:100?
How many millimetres on the drawing will 15 meters represent on the ground at a scale of 1:100?
Which term describes the mechanism that wind provides through cross flow and pressure differential?
Which term describes the mechanism that wind provides through cross flow and pressure differential?
What does a site plan show in relation to other objects?
What does a site plan show in relation to other objects?
What commonly causes cracks in the walls of a homestead over time?
What commonly causes cracks in the walls of a homestead over time?
Which of the following factors affects the resistance against current flow in a conductor?
Which of the following factors affects the resistance against current flow in a conductor?
Which tool is designed specifically for loosening and tightening bolts and nuts?
Which tool is designed specifically for loosening and tightening bolts and nuts?
What tool is used to cut internal threads in holes?
What tool is used to cut internal threads in holes?
Which tool is used for measuring outside diameters?
Which tool is used for measuring outside diameters?
Which tool is used for supporting the weight of a vehicle?
Which tool is used for supporting the weight of a vehicle?
What tool would you use to measure specific gravity of electrolytes in batteries?
What tool would you use to measure specific gravity of electrolytes in batteries?
Which tool can be used to install and remove bushings or bearings?
Which tool can be used to install and remove bushings or bearings?
Which tool is primarily used for measuring electrical problems such as volts, amps, or resistance?
Which tool is primarily used for measuring electrical problems such as volts, amps, or resistance?
Which tool is specifically designed to clean or cut outside threads on a shaft?
Which tool is specifically designed to clean or cut outside threads on a shaft?
What is a recommended safety measure to prevent the spread of fire when there is an open flame?
What is a recommended safety measure to prevent the spread of fire when there is an open flame?
Which statement is true regarding agriculture waste?
Which statement is true regarding agriculture waste?
How should unwanted chemicals and unused pesticides be disposed of?
How should unwanted chemicals and unused pesticides be disposed of?
Is it safe to store pesticide mixtures overnight before application?
Is it safe to store pesticide mixtures overnight before application?
What precaution should be taken before using portable electrical equipment?
What precaution should be taken before using portable electrical equipment?
When can emergency exits be blocked with stored materials?
When can emergency exits be blocked with stored materials?
What is one reason for wearing a welding helmet while welding?
What is one reason for wearing a welding helmet while welding?
Which component is NOT part of the SMAW process?
Which component is NOT part of the SMAW process?
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Study Notes
Tools and Equipment
- Swivel socket: Loosens and tightens bolts and nuts.
- Monkey wrench: Used for loosening and tightening pipes.
- Tap: Cuts internal threads in holes.
- Micrometre: Measures outside diameters.
- Engineering pliers: Hold objects, cut wire, or crimp.
- Stock die: Cuts or cleans outside threads on a shaft.
- Trolley jack: Supports a vehicle's weight for undercar work.
- Hydrometer: Measures specific gravity of electrolytes in batteries.
- Press: Installs and removes bushings or bearings.
- Multimeter: Measures electrical problems like volts, amps, or resistance.
Sound Test for Grinding Stone
- Inspect grinding stone by tapping it lightly with a non-metallic object.
- Listen for any dull thuds indicating cracks.
- Perform visual inspection to identify visible fissures.
- Rotate the stone while testing to cover all surfaces.
- Ensure stone is free from dirt or debris before testing.
Mechanical Terms
- Internal combustion engine: Converts fuel into mechanical energy through combustion within the engine.
- Spark ignition engine: Uses a spark plug to ignite air-fuel mixture for engine cycle.
Functions of a Piston
- Converts pressure from combustion into mechanical work.
- Provides a seal within the cylinder to maintain compression.
- Transfers energy to the connecting rod.
- Enables oil circulation for lubrication.
Crankshaft Functions
- Converts linear motion of pistons into rotational motion.
- Drives timing mechanisms for engine operation.
- Balances engine vibration and maintains engine stability.
- Transfers energy to other components in the drivetrain.
Welding Safety
- Use welding helmet to protect eyes from UV radiation and sparks.
- Shields face from extreme heat generated during welding.
- Prevents inhalation of harmful fumes produced during the process.
- Reduces the risk of skin burns from molten metal.
Electrical Power Calculation
- Power consumption calculated from current (15 A) and voltage (230 V) gives total power in kW.
- Daily and monthly operational costs determined based on usage and unit cost (R3.50).
Drawing Scale
- A scale of 1:100 means 200 mm on the drawing equals 20 m in reality.
- To find mm on drawing for 15 m on the ground, use inverse scale calculation.
Occupational Health and Safety
- Employers must maintain safe work equipment and environments.
- Workers have the right to inquire about health hazards.
- Strict rules against smoking and ensuring clear emergency exits.
- Management of agriculture waste is essential but not all is recyclable.
True or False Statements
- Understand and evaluate the validity of various safety and procedure-related statements.
- Recognize the need for proper equipment maintenance and worker protection measures.
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