Monatomic Engine -- What is the efficiency of this engine (see figure 4.9) if it were run with a monatomic gas (instead of a diatomic gas?) **23.1% is not right answer.** 2. Heat Pump -- Suppose now we run the triangle cycle (figure 4.9 above) in a reverse (counter-clockwise) cycle. If the gas is diatomic, what is the coefficient of performance for the heat pump used as a HEATER? Careful: remember that when the cycle is run counter-clockwise, the negative heats are now  heats and the positive heats are now  heats.  A. 5 B. 10 C. 4 D. 9

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A: Given: 1. Compression ignition Engine: γ=1.4r=6.5rc=3.6Tmax=1400.5 °C=1673.5 KTmin=75.5 °C=348.5 K

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.