The work output of a theoretical Otto cycle (a) increases with increase in compression ratio (b) increases with increase in pressure ratio (c) increases with increase in adiabatic index γ (d) follows...

The work output of a theoretical Otto cycle

(a) increases with increase in compression ratio

(b) increases with increase in pressure ratio

(c) increases with increase in adiabatic index γ

(d) follows all the above.

For the same compression ratio

(a) thermal efficiency of an Otto cycle is greater than that of a Diesel cycle

(b) thermal efficiency of an Otto cycle is less than that of a Diesel cycle

(c) thermal efficiency of an Otto cycle is same as that for Diesel cycle

(d) thermal efficiency of an Otto cycle cannot be predicted.