6) Which engine is more economical and compact?

Answer is:

V-Engine

Diesel Engine Overview MCQ with Answers

For more MCQ's Click Here

7) Which is the high fuel efficient engine?

Answer is:

Radial engine

8) Which is the engine also called as constant pressure cycle engine?

Answer is:

Diesel cycle

Explanation:

Diesel cycle is called constant pressure cycle because the heat addition process in diesel cycle is done at constant pressure whereas petrol cycle is called constant volume cycle as here the heat addition is done at constant volume. (Heat rejection in both the cycles is done at constant volume).