Discussion
Which of the following is not true regarding supercharging of Internal combustion engines ?
Answer: D
The statement taken as not true is It increases the consumption of lubricating oil.
The other three are the standard textbook statements about supercharging. It is defined as supplying the charge at a pressure above atmospheric, so that its density is increased (B). This is done by a compressor or blower, driven by the engine or by an exhaust turbine (C). And it is used on aircraft engines to make up for the thin air at high altitude, where an unsupercharged engine loses power (A).
The purpose and effect of supercharging is a denser charge and more power from the same engine, so the key treats the statement about lubricating oil consumption as the one that does not describe it.
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