Consider a heat engine as shown in (figure). `Q_(1) and Q_(2)` are heat added to heat bath `T_(1)` and heat taken from `T_(2)` one cycle of engine. `W` is the mechanical work done on the engine.

If `Wgt0`, then possibillities are:

Options

A. `Q_(1) gt Q_(2) gt 0`
B. `Q_(2) gt Q_(1) gt 0`
C. `Q_(2) lt Q_(1) lt 0`
D. `Q_(1) lt 0,Q_(2) gt 0`

Answer

A, C

Explanation

(figure). Represents the working of a refrigerator, wherein `Q_(1)= Q_(2)+W`
If `W gt 0, Q_(1) gt 0`.
Both `Q_(1)` and `Q_(2)` are positive.
If `Q_(2)` is negative, `Q_(1)` is also negative (but less negative as `W gt 0`). `:. Q_(2) lt Q_(1) lt 0`
Choices (a) and (c ) are corrcet.