Discussion
Otto cycle is also known as :
Answer: C
The Otto cycle is also known as the constant volume cycle.
The air-standard Otto cycle, the ideal cycle of petrol engines, consists of isentropic compression, heat addition at constant volume, isentropic expansion and heat rejection at constant volume. Heat is added almost instantaneously when the spark ignites the charge with the piston near top dead centre, so the volume hardly changes during combustion.
The constant pressure cycle is the Diesel cycle, and heat is not added at constant temperature in either; that describes the isothermal processes of the Carnot cycle.
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