1. If air-fuel mixture burns before spark plug ignites, this fault is called:
(A) Pre ignition
(B) Detonation
(C) Back pressure
(D) Ping
2. If a hot spot produces in combustion chamber, this hot spot causes a problem called:
(A) Detonation
(B) Back pressure
(C) Pre- ignition
(D) Ping
3. Which fuel causes detonation in petrol engine:
(A) High octane fuel
(B) Low octane fuel
(C) Unleaded fuel
(D) Blended fuel
4. Maximum vacuum is produced in intake manifold when:
(A) Throttle valve closed
(B) Throttle valve opened
(C) Partially opened
5. Resistance against detonation in petrol engine is measured by:
(A) Octane number
(B) Cetane number
(C) Viscosity rating
(D) Viscosity index
6. High Cetane rating fuel burns:
(A) Quickly
(B) Slowly
(C) Has no effect
(D) Normal
7. A burnt air filter element shows the problem of:
(A) Pre ignition
(B) Detonation
(C) Back pressure
(D) Turbulence
8. Cause of excessive fuel consumption is:
(A) Faulty fuel gauge
(B) Clogged fuel filter
(C) Clogged air filter
(D) Clogged oil filter
9. Knocking quality of petrol is measured in:
(A) Cetane rating
(B) Octane rating
(C) SAE rating
(D) API rating
10. A faulty high tension lead may cause engine problem:
(A) Detonation
(B) Pre ignition
(C) Engine missing
(D) Back pressure
11. A faulty spark plug may cause engine problem:
(A) Detonation
(B) Pre ignition
(C) Engine missing
(D) Back pressure
12. A cracked distributor cap may cause engine problem:
(A) Detonation
(B) Pre ignition
(C) Engine missing
(D) Back pressure
13. A burnt engine valve may cause engine problem:
(A) Detonation
(B) Pre ignition
(C) Engine missing
(D) Back pressure
14. What problem may exist if compression ratio of engine is increased:
(A) Detonation
(B) Pre ignition
(C) Engine missing
(D) Back pressure
15. What problem may exist if muffler of exhaust system partially blocked:
(A) Detonation
(B) Pre ignition
(C) Engine missing
(D) Back pressure