3. Which of the following is an external combustion engine?
C. Gasoline engine
A. Carnot engine
D. Steam engine
B. Diesel engine

4. A four-stroke cycle engine undergo procedures to perform work. Which of the following is the correct arrangement of steps in a four-stroke cycle engine?
I. The piston compresses the fuel-gas mixture. II. The spark plug ignites the compressed gas. III. Fuel-air mixture enters the cylinder. IV. The piston pushes out the waste gas.

A. IV, III, II, 1
C. II, IV, III, I
B. I, I, II, III
D. III, II, I, IV

5. Below are all heat engines that do work by using part of the heat transfer from some sources except
A. Gasoline and diesel engines
C. Hydropower
B. Geothermal plants
D. Steam turbine

6. A French Engineer who states that “Maximum efficiency is obtained if all the processes undergone by the working substance of a heat engine are reversible."
A. Count Rumford
C. Sadi Carnot
B. James Prescott Joule
D. William Thompson

7. Suppose a steam engine receives steam at 600 K. The engine uses a part of this thermal energy for work. It exhausts the rest to a condenser at a temperature of 350 K. What is the maximum efficiency of this steam engine? A. 41.67%
B. 51.57%
C. 80.67%
D. 100%

8. What is the efficiency of a heat engine that operates between reservoirs of temperatures as 1 400 K and 1 000 K?
A. 4%
B. 29%
C. 40%
D.100%

9. What must be the sink temperature of a frictionless heat engine so that it can be 100% efficient?
A. 0°C
В. ОК
C. equal to its input temperature
D. less than its input temperature

10. Why is heat engine NOT 100% efficient?
A. All gases are used up by the engine.
B. Because engine needs to be cooled down.
C. Some of the gases taken up by the piston.
D. Because all mixture of gases is converted into work.​