Question

Which of these is not an assumption made in deriving the formula for air standard of Otto cycle?

(a) There is no heat loss during the cycle

(b) The compression and expansion are isothermal

(c) The heating and cooling strictly take place at constant volume

(d) The suction and exhaust take place at atmospheric pressure

I have been asked this question at a job interview.

This key question is from Development of IC Engines in portion Internal Combustion Engines of Automobile Engineering

Answer 1

Right choice is (b) The compression and expansion are isothermal

Explanation: Compression and expansion are assumed strictly adiabatic in a Otto cycle.