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

To filter engine oil

Answer

To regulate engine cooling

Answer

To control exhaust emissions directly

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

The fuel mixture is too rich

Answer

The throttle is stuck open

Answer

The engine is overheating

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 slack chain improves smooth power delivery

Answer

Tighter chains always improve fuel economy

Answer

Chain tension is factory-set and requires no maintenance

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

Check pressures only in winter

Answer

Tyres must be pre-heated before checking

Answer

Cold weather reduces the legal minimum pressure

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

Pump the lever rapidly to build pressure

Answer

Add water to the brake reservoir temporarily

Answer

Rely on the rear brake only and continue to the destination

Question 6

What is the purpose of the fork seals on a telescopic front suspension?

Accepted Answer

To contain the fork oil within the leg, preventing leaks that would reduce damping and contaminate the front brake disc

Answer

To increase suspension stiffness

Answer

To prevent the fork from extending beyond its limit

Answer

To attach the front wheel bearings