Internal Combustion Engines
The correct sequence of the decreasing order of brake thermal efficiency of the three given basic types of engines is

Four stroke C.I. engine, four stroke S.I. engine, two stroke S.I. engine
Four stroke C.I. engine, two stroke S.I. engine, four stroke S.I. engine
Four stroke S.I. engine, four stroke C.I. engine, two stroke S.I. engine
Two stroke S.I. engine, four stroke S.I. engine, four stroke C.I. engine

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Internal Combustion Engines
In a coil ignition system of petrol engines, a condenser is connected across the contact breaker in order to

Cause more rapid break of the primary current, giving a higher voltage in the secondary circuit
None of these
Both (A) and (B)
Prevent sparking across the gap between the points

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