Assignments-Quizzes-2018 Spring ENE3010DAYAA Take Test: Quiz 02- Test Informatio

Question

Assignments-Quizzes-2018 Spring ENE3010DAYAA Take Test: Quiz 02- Test Information Description The is the second quiz on the material presented in Topic 04 and To Instructions Answer the following question by selecting the correct answer and s Multiple Attempts Not allowed. This test can only be taken once. Force Completion Once started, this test must be completed in one siting. Do not leav This test does not allow backtracking. Changes to the answer after su Question Completion Status: Moving to the next question prevents changes to this answer. Question 4 What is a heat engine? 0 A. It is a device that expels heat into the environment without doing anything else. B. It is a device that has already warmed up. C. It is a device that creates work from a heat, or temperature, difference. D. Its is a device that extracts heat from the environment Moving to the next question prevents changes to this answer. 5

Explanation / Answer

Question 4

In engineering and thermodynamics, a heat engine converts heat energy to mechanical work by using the temperature difference between a hot "source" and a cold "sink". Heat is transferred from the source, through the "working body" of the engine, to the "sink", and in this process some of the heat changes into work by using the qualities of the gas or liquid inside the engine. So option C is the correct answer.

Question 5

In a chemical reaction, only the atoms present in the reactants can end up in the products. No new atoms are created, and no atoms are destroyed. In a chemical reaction, reactants contact each other, bonds between atoms in the reactants are broken, and atoms rearrange and form new bonds to make the products. So option B is the correct answer.

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