27. A carnot engine with efficiency 50% takes heat from a source at 600 K. To increase the efficien

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27. A carnot engine with efficiency 50% takes heat from a source at 600 K. To increase the efficiency to 70%, keeping the temperature of the sink same, the new temperature of the source will be [2023]
(A) 360 K
(B) 1000 K
(C) 900 K
(D) 300 K

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