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Engineering
Mechanical
ME Set-2
Thermal Engineering
40

Thermal Engineering MCQ with Answers

40) The injector nozzle of a compression ignition engine is required to inject fuel at a sufficiently high pressure in order to

Inject fuel in a chamber of high pressure at the end of compression stroke

Inject fuel at a high velocity to facilitate atomization

Ensure that penetration is not high

All of the above

Answer is:

All of the above

Thermal Engineering MCQ with Answers

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41) If the temperature of intake air in internal combustion engine increases, then its efficiency will

Remain same

Decrease

Increase

None of the above

Answer is:

Decrease

42) The thermal efficiency of a petrol engine is ______ as compared to diesel engine.

Same

Less

None of the above

Answer is:

Less

43) In an internal combustion engine, the process of removing the burnt gases from the combustion chamber of the engine cylinder is known as

Scavenging

Detonation

Supercharging

Polymerization

Answer is:

Scavenging

Explanation:

The process of removing the burnt gases from the engine cylinder by the fresh charge coming into the engine cylinder from the crank case, is known as scavenging.

In an internal combustion engine, the process of removing the burnt gases from the combustion chamber of the engine cylinder is known as

44) In a coil ignition system of petrol engines, a condenser is connected across the contact breaker in order to

(a) Prevent sparking across the gap between the points

(b) Cause more rapid of the primary current, giving a higher voltage in the secondary circuit

Both (A) and (B)

None of the above

Answer is:

Both (A) and (B)

Thermal Engineering MCQ with Answers

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40) The injector nozzle of a compression ignition engine is required to inject fuel at a sufficiently high pressure in order to

All of the above

Thermal Engineering MCQ with Answers

Related Thermal Engineering MCQ with Answers

41) If the temperature of intake air in internal combustion engine increases, then its efficiency will

Decrease

42) The thermal efficiency of a petrol engine is ______ as compared to diesel engine.

Less

43) In an internal combustion engine, the process of removing the burnt gases from the combustion chamber of the engine cylinder is known as

Scavenging

44) In a coil ignition system of petrol engines, a condenser is connected across the contact breaker in order to

Both (A) and (B)

Thermal Engineering MCQ with Answers