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VETA Motor Vehicle Mechanics Trade Test Practice Questions - Tanzania VETA Trade Test - Motor Vehicle Mechanics Exam
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Question
1
of 25
QUESTION 1 / 25
In a four-stroke petrol engine, what is the correct order of the four strokes during one complete cycle?
Choose one answer below.
A
Intake, power, compression, exhaust
✓
B
Intake, compression, power, exhaust
✓
C
Compression, intake, exhaust, power
✓
D
Power, intake, compression, exhaust
✓
QUESTION 2 / 25
During how many crankshaft revolutions does a four-stroke engine complete one full working cycle?
Choose one answer below.
A
One revolution (360 degrees)
✓
B
Two revolutions (720 degrees)
✓
C
Three revolutions (1080 degrees)
✓
D
Four revolutions (1440 degrees)
✓
QUESTION 3 / 25
What is the fundamental difference in the method of ignition between a petrol engine and a diesel engine?
Choose one answer below.
A
Petrol uses compression ignition; diesel uses spark ignition
✓
B
Petrol uses spark ignition; diesel uses compression ignition
✓
C
Both use spark plugs to ignite the fuel
✓
D
Both rely on glow plugs for normal running
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QUESTION 4 / 25
The highest point reached by the piston in the cylinder is known as:
Choose one answer below.
A
Bottom dead centre (BDC)
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B
Top dead centre (TDC)
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C
The stroke length
✓
D
The clearance volume
✓
QUESTION 5 / 25
The distance the piston travels from top dead centre to bottom dead centre is called the:
Choose one answer below.
A
Bore
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B
Stroke
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C
Compression ratio
✓
D
Clearance
✓
QUESTION 6 / 25
The internal diameter of an engine cylinder is referred to as the:
Choose one answer below.
A
Stroke
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B
Bore
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C
Displacement
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D
Crank throw
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QUESTION 7 / 25
Compression ratio of an engine is best defined as the ratio of:
Choose one answer below.
A
Clearance volume to swept volume
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B
Total cylinder volume (swept plus clearance) to clearance volume
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C
Swept volume to bore diameter
✓
D
Stroke length to bore diameter
✓
QUESTION 8 / 25
A cylinder has a swept volume of 450 cm3 and a clearance volume of 50 cm3. What is its compression ratio?
Choose one answer below.
A
9:1
✓
B
10:1
✓
C
8:1
✓
D
11:1
✓
QUESTION 9 / 25
Which engine component converts the reciprocating (up-and-down) motion of the piston into rotary motion?
Choose one answer below.
A
Camshaft
✓
B
Crankshaft
✓
C
Flywheel
✓
D
Valve train
✓
QUESTION 10 / 25
What is the main function of the connecting rod in an engine?
Choose one answer below.
A
To time the opening of the valves
✓
B
To link the piston to the crankshaft and transmit force
✓
C
To seal combustion gases in the cylinder
✓
D
To drive the oil pump directly
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QUESTION 11 / 25
Which set of piston rings is primarily responsible for sealing the combustion chamber and preventing gas leakage past the piston?
Choose one answer below.
A
Oil control rings
✓
B
Compression rings
✓
C
Circlips
✓
D
Wrist-pin bushes
✓
QUESTION 12 / 25
What is the main purpose of the flywheel in a vehicle engine?
Choose one answer below.
A
To increase the compression ratio
✓
B
To store rotational energy and smooth out engine speed between power strokes
✓
C
To pump coolant around the engine
✓
D
To open and close the valves
✓
QUESTION 13 / 25
In an overhead-camshaft engine, what drives the camshaft from the crankshaft?
Choose one answer below.
A
The propeller shaft
✓
B
A timing belt or timing chain
✓
C
The fan belt only
✓
D
The clutch release bearing
✓
QUESTION 14 / 25
At what speed does the camshaft rotate relative to the crankshaft in a four-stroke engine?
Choose one answer below.
A
Twice crankshaft speed
✓
B
Half crankshaft speed
✓
C
The same speed as the crankshaft
✓
D
Four times crankshaft speed
✓
QUESTION 15 / 25
What is the term for the small gap left between the valve stem tip and the rocker arm (or cam) when the valve is fully closed?
Choose one answer below.
A
Valve overlap
✓
B
Valve clearance (tappet clearance)
✓
C
Valve lift
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D
Valve seat angle
✓
QUESTION 16 / 25
If the inlet valve clearance is set too small (tight), what is the most likely consequence?
Choose one answer below.
A
The valve may not close fully, leading to a burnt valve and loss of compression
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B
The engine will idle more smoothly
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C
Fuel consumption will always decrease
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D
The valve will open later than designed
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QUESTION 17 / 25
Which instrument is normally used to measure and set valve (tappet) clearance?
Choose one answer below.
A
A vernier caliper
✓
B
A feeler gauge
✓
C
A dial bore gauge
✓
D
A hydrometer
✓
QUESTION 18 / 25
What is the primary purpose of the engine lubrication system?
Choose one answer below.
A
To increase the compression ratio
✓
B
To reduce friction and wear between moving parts and help cool them
✓
C
To ignite the air-fuel mixture
✓
D
To filter the intake air
✓
QUESTION 19 / 25
Which component pressurises and circulates oil through the engine lubrication system?
Choose one answer below.
A
The water pump
✓
B
The oil pump
✓
C
The fuel pump
✓
D
The vacuum pump
✓
QUESTION 20 / 25
In the designation SAE 15W-40 engine oil, what does the 'W' indicate?
Choose one answer below.
A
Weight of the oil in kilograms
✓
B
Winter rating, describing the oil's flow at low temperature
✓
C
Water content of the oil
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D
Wear additive percentage
✓
QUESTION 21 / 25
What is the main function of the cooling system in a motor vehicle engine?
Choose one answer below.
A
To keep the engine at its correct operating temperature
✓
B
To increase engine compression
✓
C
To supply current to the spark plugs
✓
D
To store fuel for combustion
✓
QUESTION 22 / 25
What is the main purpose of the thermostat in an engine cooling system?
Choose one answer below.
A
To pump coolant through the radiator
✓
B
To control coolant flow so the engine warms up quickly and stays at operating temperature
✓
C
To measure the level of coolant in the tank
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D
To filter dirt out of the coolant
✓
QUESTION 23 / 25
A pressurised radiator cap is used in the cooling system mainly because:
Choose one answer below.
A
It lowers the boiling point of the coolant
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B
Raising system pressure raises the boiling point of the coolant, allowing higher operating temperatures without boiling
✓
C
It increases the freezing point of the coolant
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D
It stops the water pump from cavitating only
✓
QUESTION 24 / 25
Which of the following is a common symptom of engine overheating?
Choose one answer below.
A
Temperature gauge reading high and possible coolant loss or steam
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B
The engine cranks but the lights dim
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C
Excessive tyre wear on one side
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D
The horn fails to sound
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QUESTION 25 / 25
In a modern petrol engine, what is the main function of the fuel injector?
Choose one answer below.
A
To compress the air entering the cylinder
✓
B
To spray a precisely metered, atomised quantity of fuel into the intake or cylinder
✓
C
To generate the spark for combustion
✓
D
To filter the engine oil
✓
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