Consider a heat engine as shown in figure. Q_1 and Q_2 are heat added both to T_1 and heat taken from T_2 in one cycle of engine. W is the mechanical work done on the engine.

Q: Consider a heat engine as shown in figure. Q₁ and Q₂ are heat added both to T₁ and heat taken from T₂ in one cycle of engine. W is the mechanical work done on the engine.

If W > 0, then possibilities are

(a) Q₁ > Q₂ > 0

(b) Q₂ > Q₁ > 0

(c) Q₂ < Q₁ < 0 (d) Q₁ < 0 , Q₂ > 0

Ans: (a) & (c)