Which is the most effective way to increase the efficiency of a Carnot heat engine: a) increase the temperature of the high-temperature reservoir b) decrease the temperature of the low-temperature reservoir by the same amount? c) both methods are equally effective as the relative temperature change is the same in both cases d) A Carnot engine is already perfectly efficient and the efficiency cannot be improved by either method

The efficiency of Carnot engine is defined as, η=1-T2T1 Let the temperature of high-temperature…

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		a) increase the temperature of the high-temperature reservoir
		b) decrease the temperature of the low-temperature reservoir by the same amount?
		c) both methods are equally effective as the relative temperature change is the same in both cases
		d) A Carnot engine is already perfectly efficient and the efficiency cannot be improved by either method