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Sri Lanka NVQ L3 Motorcycle Mechanic Practice Questions - Sri Lanka NVQ Level 3 Motorcycle Mechanic Written Examination Exam
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Question
1
of 25
QUESTION 1 / 25
In a four-stroke motorcycle engine, what is the correct sequence of the operating strokes?
Choose one answer below.
A
Intake, Compression, Power, Exhaust
✓
B
Compression, Intake, Power, Exhaust
✓
C
Intake, Power, Compression, Exhaust
✓
D
Power, Intake, Compression, Exhaust
✓
QUESTION 2 / 25
What is the primary function of the piston rings in a motorcycle engine?
Choose one answer below.
A
To seal the combustion chamber and prevent oil from entering it
✓
B
To connect the piston to the small end of the connecting rod
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C
To transfer heat directly from the cylinder head to the engine block
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D
To control the opening and closing of the intake and exhaust valves
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QUESTION 3 / 25
Which tool is most appropriate for measuring the cylinder bore diameter of a motorcycle engine to check for wear or out-of-roundness?
Choose one answer below.
A
Dial bore gauge
✓
B
Vernier caliper
✓
C
Feeler gauge
✓
D
Thread pitch gauge
✓
QUESTION 4 / 25
What is the purpose of the reed valve in a two-stroke motorcycle engine?
Choose one answer below.
A
To prevent the air-fuel mixture from backflowing into the carburetor during the crankcase compression stroke
✓
B
To regulate the flow of oil from the oil pump to the crankshaft bearings
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C
To control the timing of the exhaust port opening
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D
To compress the air-fuel mixture in the combustion chamber
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QUESTION 5 / 25
Which engine layout utilizes two overhead camshafts per cylinder head?
Choose one answer below.
A
DOHC
✓
B
SOHC
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C
OHV
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D
Side-valve
✓
QUESTION 6 / 25
When performing a dry compression test on a motorcycle engine, a low reading is obtained. After adding a teaspoon of engine oil to the cylinder (wet test), the reading increases significantly. What does this indicate?
Choose one answer below.
A
Worn or damaged piston rings
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B
Leaking cylinder head gasket
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C
Leaking intake or exhaust valves
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D
Cracked cylinder head
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QUESTION 7 / 25
Which component of the valve train is responsible for converting the rotating motion of the camshaft into the linear opening motion of the valves?
Choose one answer below.
A
Rocker arm / Tappet
✓
B
Valve spring
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C
Cam chain
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D
Valve guide
✓
QUESTION 8 / 25
What does a 'squish band' refer to in a motorcycle engine cylinder head?
Choose one answer below.
A
The area between the piston crown and the cylinder head designed to create turbulence during compression
✓
B
The groove where the cylinder head gasket is seated
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C
The space where the spark plug threads into the cylinder head
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D
The oil clearance between the camshaft journal and its bearing surface
✓
QUESTION 9 / 25
Which of the following is the correct method for checking piston ring end gap?
Choose one answer below.
A
Place the ring into the cylinder bore using a piston to square it, then measure the gap with a feeler gauge
✓
B
Measure the gap of the ring while it is installed on the piston ring grooves
✓
C
Hold the ring ends together and measure the outer diameter with a micrometer
✓
D
Place the ring flat on a surface plate and measure the thickness with a vernier caliper
✓
QUESTION 10 / 25
Why is it critical to synchronize the camshaft and crankshaft timing correctly during engine assembly?
Choose one answer below.
A
To prevent the valves from contacting the piston crown at high speed
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B
To balance the rotating mass of the flywheel and clutch
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C
To ensure the oil pump operates at the correct pressure
✓
D
To align the carburetor slide opening with the intake stroke
✓
QUESTION 11 / 25
What is the function of the cylinder decompressor mechanism found on some single-cylinder four-stroke motorcycles?
Choose one answer below.
A
To slightly open a valve during start-up to make kick-starting or electric starting easier
✓
B
To release pressure from the crankcase to prevent oil seal failure
✓
C
To reduce exhaust backpressure at high engine RPM for increased power
✓
D
To bypass the air filter during cold starts to enrich the fuel mixture
✓
QUESTION 12 / 25
In a motorcycle engine, what is the main purpose of the counterbalancer shaft?
Choose one answer below.
A
To cancel out primary engine vibrations caused by the reciprocating piston
✓
B
To drive the water pump and oil pump at a constant speed
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C
To assist the starter motor in turning the crankshaft over
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D
To control the primary gear ratio between the engine and the clutch
✓
QUESTION 13 / 25
Which bearing type is commonly used on the big end of a single-piece crankshaft in a single-cylinder motorcycle engine?
Choose one answer below.
A
Needle roller bearing
✓
B
Split-shell plain bearing
✓
C
Tapered roller bearing
✓
D
Thrust ball bearing
✓
QUESTION 14 / 25
What is the main advantage of using an overhead cam (OHC) engine design compared to an overhead valve (OHV) pushrod engine design?
Choose one answer below.
A
Reduced reciprocating mass in the valve train, allowing for higher engine RPM
✓
B
Lower manufacturing cost and fewer moving parts in the crankcase
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C
No requirement for engine oil lubrication in the cylinder head
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D
The ability to run the engine on lower octane fuel without knocking
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QUESTION 15 / 25
A technician measures a piston skirt diameter at the manufacturer's specified height and compares it with the cylinder bore diameter. What clearance is being calculated?
Choose one answer below.
A
Piston-to-cylinder clearance
✓
B
Piston ring side clearance
✓
C
Piston pin radial clearance
✓
D
Valve-to-piston clearance
✓
QUESTION 16 / 25
Which cylinder sleeve type is cast directly into an aluminum cylinder block and cannot be removed or bored out?
Choose one answer below.
A
Nikasil / Silicon-carbide coated cylinder
✓
B
Dry cast-iron sleeve
✓
C
Wet cast-iron liner
✓
D
Steel sleeve insert
✓
QUESTION 17 / 25
What is the function of the valve guides in a motorcycle engine?
Choose one answer below.
A
To guide the valve stem and keep the valve aligned with the valve seat
✓
B
To regulate the oil pressure flowing to the camshaft lobes
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C
To compress the valve springs when the cam rotates
✓
D
To prevent carbon deposits from forming on the valve head
✓
QUESTION 18 / 25
Under what condition does 'valve float' occur in a high-speed motorcycle engine?
Choose one answer below.
A
When the valve springs are unable to close the valves quickly enough to follow the camshaft profile at high RPM
✓
B
When oil pressure in the cylinder head is too high, causing hydraulic lifters to pump up
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C
When fuel varnish builds up on the valve stems, causing the valves to stick open
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D
When the exhaust valve remains open during the entire intake stroke
✓
QUESTION 19 / 25
What is the primary purpose of a crankcase breather system in a motorcycle engine?
Choose one answer below.
A
To release internal pressure built up by piston blow-by gases
✓
B
To supply fresh air to the carburetor idle circuit
✓
C
To cool the engine oil by circulating ambient air through the crankcase
✓
D
To lubricate the transmission gears with misted oil from the cylinder
✓
QUESTION 20 / 25
A technician is using a dial indicator to check the runout of a motorcycle crankshaft. What is being measured?
Choose one answer below.
A
The deviation of the crankshaft axis from a perfectly straight line when rotated
✓
B
The clearance between the connecting rod and the crankpin
✓
C
The total axial endplay of the crankshaft in the crankcase halves
✓
D
The balance factor of the crankshaft counterweights
✓
QUESTION 21 / 25
What is the layout of a standard constant-mesh motorcycle transmission gearbox?
Choose one answer below.
A
Gears are always in mesh, and dogs lock gears to the shafts to select ratios
✓
B
Gears slide along shafts to engage and disengage teeth directly
✓
C
A drive belt shifts across variable-diameter pulleys to change ratios
✓
D
Hydraulic fluid pressure operates planetary gear sets automatically
✓
QUESTION 22 / 25
What is the function of the clutch friction plates in a wet multi-plate clutch assembly?
Choose one answer below.
A
To lock the clutch basket to the inner hub when pressure is applied by the clutch springs
✓
B
To cushion the shock of gear engagement using rubber dampers
✓
C
To drive the oil pump using teeth on the outer diameter
✓
D
To prevent the transmission from shifting into two gears at once
✓
QUESTION 23 / 25
Why is it called a 'wet' clutch on most motorcycles?
Choose one answer below.
A
Because the clutch assembly operates submerged in or sprayed with engine oil
✓
B
Because it is cooled by a dedicated water-jacket circuit
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C
Because it uses hydraulic fluid instead of a cable to actuate the pressure plate
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D
Because it is designed to operate only in rainy weather conditions
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QUESTION 24 / 25
Which tool is required to measure the wear and thickness of clutch friction plates to determine if they need replacement?
Choose one answer below.
A
Outside micrometer or vernier caliper
✓
B
Feeler gauge set
✓
C
Dial indicator
✓
D
Thread pitch gauge
✓
QUESTION 25 / 25
What is the function of the shift drum in a motorcycle gear-shifting mechanism?
Choose one answer below.
A
To translate the rotational movement of the gear pedal into linear movement of the shift forks
✓
B
To engage the clutch pressure plate when the clutch lever is pulled
✓
C
To lock the transmission output shaft to prevent the motorcycle from rolling
✓
D
To drive the speed sensor on the countershaft
✓
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