A Carnot Engine Operates Between Two Reservoirs with Unknown Temperatures $67 \%$

question 104

Multiple Choice

A Carnot engine operates between two reservoirs with unknown temperatures. If the Carnot engine operates at $67 \%$ efficiency, what is the ratio of the absolute temperatures of the reservoirs, T_c/T_h?

• A) 0.33
• B) 0.0012
• C) 0.0025
• D) 0.67

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Definitions:

Unlike Polarity

Refers to opposite electrical charges or magnetic poles that attract each other.

Electro-Magnets

Devices that create a magnetic field when electric current flows through a coil wrapped around a metal core.

Magnetic Pole Fields

The regions at the two ends of a magnet where the magnetic force is strongest, known as the north and south magnetic poles.

Synchronous Speed Calculation

Synchronous speed calculation is the process of determining the speed at which the magnetic field of an AC motor rotates, which is based on the frequency of the power supply and the number of magnetic poles in the motor.