Lupiel, unswer the Jollowing questions. Friction 1. Lack of causes moving engine parts to overheat, tearing bits of metal from each other. (A) refrigerant (B) intake air (C) lubrication (D) exhaust back pressure 2. Friction causes all of the following issues in an engine, except: (A) hardened oil seals. (B) part wear. (C) decreased potential engine power. (D) heat. a Define friction.

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IC engines

The term "engine" indicates a mechanical device/machine used to convert input energy to a specific mechanical output. The input energy may be in the form of chemical energy, thermal energy, or so on and mechanical output is in the form of mechanical energy (work done). Generally, the engines classify into two groups which are internal combustion type and external combustion type, and further, these two types can be classified into two types that are reciprocating and rotary engines.