6. Methane burns with a stoichiometric quantity of air. The air-fuel ratio by weight is-

A. 14.7

B. 1/4

C. 4

D. 17.4

Click for Answer/Explanation

Correct Answer is D

Read More- Heat and Mass Transfer: Objective Questions with Answers

7. The Cetane Number of automotive diesel fuel used in India is-

A. range of 30 – 40

B. range of 41 – 50

C. range of 51 – 60

D. range of 61 – 70

Click for Answer/Explanation

Correct Answer is B

8. Where does the mixing of fuel and air take place in the case of diesel engines?

A. Injector

B. Inlet manifold

C. Injection pump

D. Engine cylinder

Click for Answer/Explanation

Correct Answer is D

9. Piston compression rings are made up of which one of these-

A. Aluminum

B. Bronze

C. Cast Iron

D. Brass

Click for Answer/Explanation

Correct Answer is C

Gray Cast Iron has the property of self-lubrication & damping of small vibrations.

10. An I.C. engine has a bore and stroke each equal to 2 units. The total area to calculate heat loss from the engine can be taken as-

A. 4π

B. 8π

C. 12π

D. 2π

Click for Answer/Explanation

Correct Answer is A

Area = π×D×L

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