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%
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
More PE Exam Questions
- 1Using the Gibbs Phase Rule, how many intensive properties are required to fix a mixture of water and ammonia that is in a liquid state?
- 2
What is the standard equation for calculating the future worth (F) when given the annual rate of return (I) and the present rate (P)?
- 3What is the gauge pressure of at a point that is 15 meters below the surface of water that has an atmospheric pressure of 14.7 PSIA?
- 4
A tube that is 10 feet long and 2 feet in diameter is placed in an air stream. The flow of the air is at a speed of 15 ft/s and is perpendicular to the long axis of the tube. If the coefficient of drag is 1.3 and the density of air is 0.075 lbm/ft3 What is the drag on the cylinder?
- 5
The following data have been collected:
Which of the following statements is true?