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What is the thermal efficiency for a Carnot engine that operates between 100F and 400K?

(A) 75%

(B) 77.5%

(C) 7.8%

(D) 22.3%

The Correct Answer
Explanation

What would the annuity be over a 20 year period that has an interest rate of 10% and a present worth of $500?

(A) $58.75 (B) $42.55 (C) $8.51 (D) $ 63.75

Correct Answer: A

A copper ball that is 1.5 m in diameter has a temperature of 100C. The environment is at 0C. If the emissivity of copper is 0.15 how much power is radiated by the copper ball?

(A) 6 w (B) 5,264 W (C) 500 W (D) 1,164 W

Correct Answer: D

How much heat is dissipated when a current of 15 amps passes through a 4 ohm resistor?

(A)3,075 btuh (B) 900 btuh (C) 2,700 btuh (D) 9,300 btuh

Correct Answer: A

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