It’s been many years since I left school; I came across this question by chance
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Question: A train is running on the railways in our country. Under the following geographical and climatic conditions, in which case does the internal combustion engine achieve the highest thermal efficiency? A. Summer in the south B. Summer in the north C. Winter in the south D. Winter in the north. Question: After adiabatic throttling of a working fluid: A. Pressure decreases, temperature remains unchanged, entropy increases B. Pressure decreases, temperature remains unchanged, entropy remains constant C. Pressure remains unchanged, temperature is uncertain, entropy increases D. Pressure decreases, temperature is uncertain, entropy increases
These were all learned in school, but I’ve forgotten them later on. The first question should be D, and the second one should be A. Please correct me if I’m wrong