UK Motorcycle Theory Test Mechanical Knowledge

Question 1

What is the purpose of the throttle body or carburettor on a motorcycle engine?

Accepted Answer

To mix air and fuel in the correct ratio for combustion

Answer

The throttle body (on injected engines) or carburettor (on older engines) controls and mixes the air-fuel charge entering the engine; the correct ratio is critical for efficient power and low emissions.

Question 2

What does a sudden increase in engine revs without a corresponding increase in speed suggest?

Accepted Answer

Clutch slip — the clutch plates are worn and no longer transmitting full engine power to the gearbox

Answer

If the engine revs rise but the motorcycle does not accelerate proportionally, the clutch is slipping — not gripping fully — indicating worn friction plates that need replacement.

Question 3

Motorcycle chain tension should be checked regularly because:

Accepted Answer

Excessive chain slack can cause it to slap against the engine casings, jump the sprocket or snap at high revs — all potentially catastrophic

Answer

A loose chain creates dangerous slack that can jam or snap; an over-tightened chain places excessive load on wheel bearings; correct tension within manufacturer-specified limits is essential for safe operation.

Question 4

What does the 'tyres cold' warning mean when checking tyre pressures?

Accepted Answer

Check the pressure before riding, as heat from riding increases tyre pressure by 4-6 psi above cold readings, which would give a false high reading

Answer

Tyre pressures must be checked when the tyre is cold (before riding more than 1-2 miles); after riding, heat increases pressure, giving a falsely high reading that does not reflect the correct cold-inflation figure.

Question 5

What should a motorcyclist do if the front brake lever becomes spongy or goes to the handlebar?

Accepted Answer

Stop riding — this indicates air in the brake lines or low brake fluid, causing significantly reduced braking effectiveness and requiring immediate professional inspection

Answer

A spongy or long-travel brake lever indicates air in the hydraulic system or very low fluid; the braking force is drastically reduced and the motorcycle must not be ridden until the system is bled and inspected.

DVSA UK Driving Theory Practice Test

DVSA UK Driving Theory Practice Test

UK Motorcycle Theory Test Mechanical Knowledge