Which of the following possibilities could increase the efficiency of a heat engine or an internal combustion engine?(a) Increase the temperature of the hot part of the systemand reduce the temperature of the exhaust.(b) Increase the temperatures of both the hot part and theexhaust part of the system by the same amount.(c) Decrease the temperatures of both the hot part andthe exhaust part of the system by the same amount.(d) Decrease the temperature of the hot part and increasethe temperature of the exhaust part by the sameamount.(e) None of the above; only redesigning the engine orusing better gas could improve the engine’s efficiency.

University Physics Volume 2
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Chapter3: The First Law Of Thermodynamics
Section: Chapter Questions
Problem 92AP: Two moles of a monatomic ideal gas such as oxygen is compressed adiabatically and reversibly from a...
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Which of the following possibilities could increase the efficiency of a heat engine or an internal combustion engine?
(a) Increase the temperature of the hot part of the system
and reduce the temperature of the exhaust.
(b) Increase the temperatures of both the hot part and the
exhaust part of the system by the same amount.
(c) Decrease the temperatures of both the hot part and
the exhaust part of the system by the same amount.
(d) Decrease the temperature of the hot part and increase
the temperature of the exhaust part by the same
amount.
(e) None of the above; only redesigning the engine or
using better gas could improve the engine’s efficiency.

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