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Even carnot heat engine cannot give 100%...

Even carnot heat engine cannot give `100%` efficiency. Explain why
OR
can you design a heat engine of `100%` efficiency? Explain ypur answer.
OR
A heat engine with `100%` efficiency is only a theoretical possibility. Explain.

Text Solution

Verified by Experts

The correct Answer is:
The efficiency of a heat engine,
`eta =1 -(T_(2))/(T_(1))`
The efficiency will be `100% or 1, if T_(2) = 0K`
Since temperature equal to `0K` cannot be reached, a heat engine cannot have `100%` efficiency.
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Knowledge Check

  • Even Carnot engine cannot give 100% efficiency because we cannot

    A
    prevent radiation
    B
    find ideal sources
    C
    reach absolute zero temperature
    D
    eliminate friction.

  • An ideal heat engine can be 100% efficient if its sink is at

    A
    0K
    B
    273K
    C
    `0^(@)C`
    D
    `0^(@)F`

  • Efficiency of a Carnot's engine is 100% when

    A
    sing is at`0^(@)C`
    B
    sink is at 0K
    C
    source is at `273^(@)C`
    D
    source is at `100^(@)C`

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