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231.

Which of the following symptoms will not show that the combustion is necessarily complete or not?

A.	Presence of free carbon in exhaust	B.	Presence of carbon monoxide in the exhaust
C.	Presence of oxygen is the exhaust	D.	Presence of nitrogen in the exhaust
E.	None of the above

232.

In automobile ignition system contact breaker is used for

A.	Opening and closing the primary circuit	B.	opening and closing the secondary circuit
C.	increasing the duration of spark	D.	increasing the intensity of spark

233.

In automobile ignition system, a distributor is mounted on

A.	low voltage side	B.	high voltage side
C.	both low as well as high voltage side	D.	neither low voltage nor high voltage side

234.

A four sylinder four stroke petrol engine running at 1000 rpm will have in all how many sparks in one minute?

A.	250	B.	500
C.	1000	D.	2000

235.

In spark plug the gap between the electrodes is

A.	10 mm	B.	around 5 mm
C.	around 1 mm	D.	less than 1 mm

236.

As the gap between the electrodes of the spark plug increases

A.	spark intensity increases	B.	voltage required for sparking increases
C.	voltage required for sparking decreases	D.	frequency of sparking increases

237.

Which of the following part is not needed on spark ignition engines using magneto ignition?

A.	Battery	B.	Spark plug
C.	Distributor	D.	Induction coil

238.

Ignition system used in scooters is

A.	magneto system	B.	battery system
C.	Combination of magneto and battery system	D.	neither magneto nor battery system

239.

Which of the following hydrocarbon has ring structure?

A.	Paraffin	B.	Olefin
C.	Diolefin	D.	Naphthene

240.

Boiling range of kerosene is

A.	50 to 100?C	B.	100 to 150?C
C.	150 to 300?C	D.	350 to 500?C