A Real (Non-Carnot) Heat Engine, Operating Between Heat Reservoirs at Temperatures

question 39

Multiple Choice

A real (non-Carnot) heat engine, operating between heat reservoirs at temperatures of 650 K and 270 K, performs 4.3 kJ of net work and rejects 8.0 kJ of heat in a single cycle. The thermal efficiency of this heat engine is closest to

• A) 0.35
• B) 0.31
• C) 0.28
• D) 0.38
• E) 0.42

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Definitions:

Secondary Appraisal

The process of evaluating one's ability to cope with or manage the consequences of a potentially stressful event.

Primary Appraisal

The initial process by which an individual evaluates the significance of a situation or event as a potential threat, challenge, or harm to their wellbeing.

Alarm Stage

The first stage of the general adaptation syndrome, in which the person experiences a burst of energy that aids in dealing with the stressful situation.

Resistance Stage

The second phase of the general adaptation syndrome, where the body adapts to and resists stressors with increased performance of various defensive mechanisms.