Take Motor Vehicle Mechanics Practice Questions - CTVET Ghana Certificate II - Motor Vehicle Mechanics Exam

QUESTION 1 / 25

Which class of fire extinguisher is specifically designed to put out electrical fires in an automotive workshop?

Choose one answer below.

AClass A✓BClass B✓CClass C✓DClass D✓

QUESTION 2 / 25

What type of eye protection should be worn when operating a bench grinder to sharpen tools?

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AStandard prescription reading glasses✓BSafety goggles or a full face shield✓CWelding helmet with dark lens✓DPolarized sunglasses✓

QUESTION 3 / 25

When lifting a vehicle with a hydraulic floor jack, what is the most critical safety action to take before working underneath it?

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ASupport the vehicle with certified jack stands on level ground✓BEngage the vehicle steering wheel lock✓CPlace wooden blocks under the tires to prevent rolling✓DKeep the hydraulic jack under pressure without additional support✓

QUESTION 4 / 25

What is the correct tool used to check the cylinder bore of an engine block for out-of-roundness?

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AFeeler gauge✓BThread pitch gauge✓CCylinder dial bore gauge✓DDepth micrometer✓

QUESTION 5 / 25

A mechanic needs to measure the clearance between a piston ring and the piston ring groove. Which tool is best suited for this task?

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AVernier caliper✓BFeeler gauge✓CInside micrometer✓DThread pitch gauge✓

QUESTION 6 / 25

Why is it important to use a torque wrench when tightening cylinder head bolts?

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ATo speed up the engine assembly process✓BTo ensure even clamping force and prevent cylinder head warpage✓CTo prevent the bolts from ever being loosened again✓DTo measure the length of the cylinder head bolts✓

QUESTION 7 / 25

When reading a metric vernier caliper, what does the vernier scale measure?

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AFractions of a millimeter✓BWhole centimeters✓CInches and feet✓DDegree angles of inclination✓

QUESTION 8 / 25

What safety precaution should be taken when charging a lead-acid vehicle battery?

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AKeep the battery tightly sealed in a wooden box✓BCharge it in a well-ventilated area to prevent hydrogen gas buildup✓CPlace it near an open flame to speed up the chemical reaction✓DEnsure the positive and negative terminals are shorted together✓

QUESTION 9 / 25

What is the correct way to store pressurized gas cylinders (like oxygen and acetylene) in an automotive workshop?

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ALaying horizontally on the floor under workbenches✓BUpright, secured with chains, and away from heat sources✓CStacked on top of each other in a corner✓DIn a sealed, airtight storage cabinet with no ventilation✓

QUESTION 10 / 25

If a workshop chemical splashes into a mechanic's eyes, what is the recommended immediate first-aid action?

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ARub the eyes vigorously with a clean cotton rag✓BApply eye drops and wait for the stinging to stop✓CFlush the eyes with clean, running water for at least 15 minutes✓DNeutralize the chemical by pouring a mild acid or base into the eye✓

QUESTION 11 / 25

When using an outside micrometer, what is the purpose of the ratchet stop at the end of the thimble?

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ATo lock the spindle in place once the measurement is taken✓BTo prevent the micrometer frame from bending✓CTo ensure uniform measuring pressure is applied to the workpiece✓DTo quickly adjust the micrometer from zero to maximum range✓

QUESTION 12 / 25

A dial indicator is set up to measure the lateral runout of a flywheel. During one full rotation, the needle sweeps from -0.05 mm to +0.07 mm. What is the total runout?

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A0.02 mm✓B0.07 mm✓C0.12 mm✓D0.06 mm✓

QUESTION 13 / 25

Which stroke of the four-stroke internal combustion cycle is responsible for pushing exhaust gases out of the cylinder?

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AIntake stroke✓BCompression stroke✓CPower stroke✓DExhaust stroke✓

QUESTION 14 / 25

What engine component connects the piston to the connecting rod?

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ACrankpin✓BGudgeon pin (piston pin)✓CCam lobe✓DKingpin✓

QUESTION 15 / 25

What is the primary function of the engine thermostat in a liquid cooling system?

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ATo measure the amount of oil in the engine oil pan✓BTo control the flow of coolant to maintain correct engine operating temperature✓CTo drive the water pump belt at a constant speed✓DTo turn on the electric cooling fan when the engine gets hot✓

QUESTION 16 / 25

What is the main purpose of engine oil viscosity ratings (e.g., SAE 20W-50)?

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ATo indicate the oil's resistance to flow at specific temperatures✓BTo show the color and purity level of the refined oil✓CTo measure the detergent and cleaning power of the oil✓DTo state the boiling point of the oil under pressure✓

QUESTION 17 / 25

Which engine parts are installed in piston grooves to seal the combustion chamber and scrape excess oil from cylinder walls?

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ACylinder liners✓BPiston rings✓CValve stem guides✓DThrust washers✓

QUESTION 18 / 25

What effect does the radiator pressure cap have on the engine cooling system?

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AIt decreases coolant pressure to prevent hose leaks✓BIt raises the boiling point of the coolant✓CIt automatically filters dirt out of the radiator✓DIt controls the speed of the water pump impeller✓

QUESTION 19 / 25

Which engine component converts the linear reciprocating motion of the pistons into rotary motion?

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ACamshaft✓BPushrod✓CCrankshaft✓DRocker arm✓

QUESTION 20 / 25

In a four-stroke petrol engine, what is the exact position of the valves during the compression stroke?

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AIntake valve is open, exhaust valve is closed✓BIntake valve is closed, exhaust valve is open✓CBoth the intake and exhaust valves are closed✓DBoth the intake and exhaust valves are open✓

QUESTION 21 / 25

What is the main structural difference between a diesel engine and a petrol engine regarding fuel ignition?

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ADiesel engines use a high-voltage spark plug to ignite fuel✓BDiesel engines rely on the heat of highly compressed air for ignition✓CDiesel engines require a carburetor to premix fuel with air before ignition✓DDiesel engines ignite fuel using a heated exhaust valve✓

QUESTION 22 / 25

What is the typical compression ratio range of a passenger car petrol engine compared to a diesel engine?

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APetrol: 8:1 to 12:1; Diesel: 15:1 to 22:1✓BPetrol: 15:1 to 22:1; Diesel: 8:1 to 12:1✓CPetrol: 5:1 to 7:1; Diesel: 30:1 to 40:1✓DPetrol: 20:1 to 25:1; Diesel: 5:1 to 10:1✓

QUESTION 23 / 25

During an engine inspection, a mechanic notices blue-gray smoke continuously emitting from the exhaust pipe. What is the most likely cause?

Choose one answer below.

AAn overly rich air-fuel mixture (excess fuel)✓BCoolant leaking into the combustion chamber✓CEngine oil burning in the combustion chambers✓DA restricted exhaust system or clogged muffler✓

QUESTION 24 / 25

What is the function of the camshaft in an internal combustion engine?

Choose one answer below.

ATo coordinate the ignition spark timing with the alternator✓BTo open and close the intake and exhaust valves at the correct time✓CTo drive the oil pump and water pump via the starter motor✓DTo rotate the crankshaft using hydraulic engine oil pressure✓

QUESTION 25 / 25

What type of valve train configuration uses two separate camshafts located within the cylinder head?

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AOverhead Valve (OHV)✓BSingle Overhead Camshaft (SOHC)✓CDouble Overhead Camshaft (DOHC)✓DUnder-head Camshaft (UHC)✓