1. Diagnostic means:
(A) Tune up
(B) To find cause of a problem
(C) Engine service
(D) Wire up an electrical circuit
2. Diagnostic is:
(A) Hit and trial method
(B) By chance
(C) A systematic approach
(D) All are diagnosing
3. Following is a step of diagnosing:
(A) Communication with customer
(B) All are correct
(C) Checking components one by one
(D) Inspection and verify
4. Technician hears double metallic click. Possible cause may be:
(A) Piston pin worn
(B) Loose tappet
(C) Piston slap
(D) Detonation
5. A technician inserts feeler gauge between valve stem and rocker arm. If noise decreases, it shows:
(A) Excessive valve clearance
(B) Insufficient valve clearance
(C) Correct clearance
(D) All are incorrect
6. Engine cranks normally but does not start, following is not possible reason:
(A) Incorrect ignition timing
(B) Thermostat stuck closed
(C) Air leakage through intake manifold
(D) Carburetor overfuelling
7. Different cylinder misses. Following is not a reason:
(A) Weak battery
(B) Weak compression
(C) Engine is overheated
(D) Carbon in head
8. Engine runs on after switching off. Following statement is correct:
(A) All are correct
(B) Carbon deposits in cylinder head
(C) Advance ignition timing
(D) No current at idle solenoid
9. Low engine oil pressure is not caused by:
(A) Tight pressure relief valve spring
(B) Worn engine bearings
(C) Thin oil
(D) Choked oil line
10. Engine backfires. Following possible reason is correct:
(A) All are correct
(B) Wrong heat range of spark plugs
(C) Plug wires not sorted properly
(D) Incorrect ignition timing