## What cycle is the most efficient?

(A) Carnot

(B) Brayton

(C) Diesel

(D) Otto

What is the elongation of a 2 meter aluminum bar when it has been stressed to 512 MPa? (E = 69 GPa)?

(A) 1.5 cm (B) 2.0 cm (C) 1.0 cm (D) 1.7 cm

**Correct Answer: A**

An 18 wheeler has a mass of 28,000 kilograms when fully loaded. The truck goes from 0 to 90 kilometers per hour in 120 seconds. What is the force on the 18 wheeler due to acceleration?

（A）1.08 kN （B） 15.82 kN （C） 10.71 kN （D） 5.83 kN

**Correct Answer: D**

What 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?

（A）147,150 pa （B） 150,000 pa （C） 147,250 pa （D） 147,000 pa

**Correct Answer: A**

### More PE Exam Questions

- 1
A company can manufacture a product using hand tools. Tools will cost $1,000, and the manufacturing cost per unit will be $1.50. As an alternative, an automated system will cost $15,000 with a manufacturing cost per unit of $0.50. With an anticipated annual volume of 5,000 units and neglecting interest, the break-even point (years) is most nearly:

- 2How much heat is dissipated when a current of 15 amps passes through a 4 ohm resistor?
- 3
If a process is considered to be internally reversible and adiabatic, what can the change in entropy be assumed to be?

- 4A spaceship leaves the space station with an acceleration of 15 ft/s2. After 3 minutes the engines turn off and the acceleration is 0 ft/s2. What is the average velocity of the spaceship?
- 5What cycle is the most efficient?