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371.

The gap of spark plug generally should be:

A.	0.1 mm	B.	0.3 mm
C.	0.5 mm	D.	0.6 mm

372.

Magneto system is:

A.	Rotating armature type	B.	Rotating magnet type
C.	Both (a) & (b)	D.	None of these

373.

Contact breaker points is generally made have:

A.	Steel	B.	Copper
C.	Nickel	D.	Tungsten

374.

The material commonly used for insulator of spark plug is:

A.	Alumina	B.	Asbestos
C.	Copper	D.	Steel

375.

The life of spark plug used in 2-stroke engine as compared to 4-stroke engines is:

A.	Same	B.	Twice
C.	Thrice	D.	One-half

376.

Spark plug having white centre insulator indicates:

A.	Retarded ignition	B.	Leaded fuel
C.	Over advaned ignition	D.	All are correct

377.

A spark plug with a black center insulator indicates:

A.	Over advanced ignition	B.	Retarded ignition
C.	Stock-up choke valve in carburetor	D.	None of these

378.

Cold spark plug has:

A.	Long insulator	B.	Short insulator
C.	Very long insulator	D.	None of these

379.

Hot plug has:

A.	Long insulator	B.	Small thread
C.	Both (a) & (b)	D.	None of these

380.

Spark advance is associated to:

A.	Low speed engine	B.	Medium speed engine
C.	High sped engine	D.	Stemp engine