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Consider a heat engine as shown in (figu...

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:

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`

Text Solution

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The correct Answer is:
A, C
(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.
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Knowledge Check

  • 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. If Wgt0 , then possibilities are

    A
    `Q_(1)gtQ_(2)gt0`
    B
    `Q_(2)gtQ_(1)gt0`
    C
    `Q_(2)ltQ_(1)lt0`
    D
    `Q_(1)lt0, Q_(2)gt0`

  • A heat engine absorbs heat Q_(1) at temperature T_(1) and heat Q_(2) at temperature T_(2) , work done by the engine is J (Q_(1)+Q_(2)) this data

    A
    violatews 1st law of thermodynamics
    B
    violates 1st law of thermodynamics if `Q_(1)` is -ve
    C
    violates 1st law of thermodynamics of `Q_(2)` is -ve
    D
    doesnot violate 1st law of thermodynamics

  • A heat engine absorbs heat Q_(1) at temperature T_(1) and heat Q_(2) at temperature T_(2) . Work done by the engine is (Q_(1)+Q_(2)) . This data

    A
    Violates `I^(st)` law of thermodynamics
    B
    Violates `I^(st)` law of thermodynamics if `Q_(1)` is -ve
    C
    Violates `I^(st)` law of thermodynamics if `Q_(2)` is -ve
    D
    Does not violate `I^(st)` law of thermodynamics
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