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In an Otto cycle, how does heat addition takes place?

In an Otto cycle, how does heat addition takes place? Correct Answer Reversibly at constant volume

The air-standard-Otto cycle is the idealized cycle for the spark-ignition internal combustion engines.

The Otto cycle 1-2-3-4 consists of following four process :

  • Process 1-2: Reversible adiabatic compression of air
  • Process 2-3: Heat addition at constant volume
  • Process 3-4: Reversible adiabatic expansion of air
  • Process 4-1: Heat rejection at constant volume
     

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Otto  Cycle               ⇒ Constant volume heat addition.

                                 ⇒ Constant volume heat rejection.

Carnot Cycle            ⇒ Constant temperature heat addition.

                                 ⇒ Constant temperature heat rejection.

Diesel Cycle             ⇒ Constant pressure heat addition.

                                 ⇒ Constant volume heat rejection.

Dual Cycle                ⇒ Constant volume and constant pressure heat addition

                                 ⇒ Constant volume heat rejection

Related Questions

Group I shows different heat addition processes in power cycles. Likewise, Group II shows different heat removal processes. Group III lists power cycles. Match items from Groups I, II and III. Group I Group II Group III P. Pressure constant S. Pressure constant 1. Rankine cycle Q. Volume constant T. Volume constant 2. Otto cycle R. Temperature constant U. Temperature constant 3. Carnot cycle     4. Diesel cycle     5. Brayton cycle
Consider the following statements: 1. Both Otto and Diesel cycles are special cases of dual combustion cycle 2. Combustion process in IC engines is neither fully constant volume nor fully constant pressure process 3. Combustion process in ideal cycle is replaced by heat addition from internal source in closed cycle 4. Exhaust process is replaced by heat rejection in ideal cycle Which of the above statements are correct?
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