IC Engines - Interview Questions | Exam2Win

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6. The thermal efficiency of a diesel cycle having fixed compression ratio, with increase in cut-off ratio will

A. increase

B. decrease

C. be independent

D. may increase or decrease depending on other factors

E. none of the above.

Explanation:

7. In a typical medium speed 4-stroke cycle diesel engine the inlet valve

A. opens at 20� before top dead center and closes at 35� after the bottom dead center

B. opens at top dead center and closes at bottom dead center

C. opens at 10� after top dead center and closes 20� before the bottom dead center

D. may open or close anywhere

E. remains open for 200�.

Explanation:

8. Fuel oil consumption guarantees for I .C. engine are usually based on

A. low heat value of oil

B. high heat value of oil

C. net calorific value of oil

D. calorific value of fuel

E. all of the above.

Explanation:

9. The fuel in diesel engine is normally injected at pressure of

A. 5-10 kg/cm2

B. 20-25 kg/cm2

C. 60-80 kg/cm2

D. 90-130 kg/cm2

E. 150-250 kg/cm2

Explanation:

10. Does the supply of scavenging air at a density greater than that of atmosphere mean engine is supercharged ?

A. yes

B. no

C. to some extent

D. unpredictable

E. depends on other factors.

Explanation: