Q:

In a four stroke cycle diesel engine, the inlet valve __________

A) opens at 20º before top dead center and closes at 40º after bottom dead center B) opens at 20º after top dead center and closes at 20º before bottom dead center
C) opens at top dead center and closes at bottom dead center D) may open or close anywhere
 
Answer & Explanation Answer: A) opens at 20º before top dead center and closes at 40º after bottom dead center

Explanation: None.

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15
Q:

In a four stroke cycle petrol engine, the charge is compressed when both the valves (i.e. inlet valve and exit valve) are closed.

A) True B) False
C) Both the valves are open D) None of the mentioned
 
Answer & Explanation Answer: A) True

Explanation: None.

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36
Q:

The inlet valve of a four stroke cycle internal combustion engine remains open for __________

A) 130º B) 180º
C) 230º D) 270º
 
Answer & Explanation Answer: C) 230º

Explanation: None.

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25
Q:

The exhaust valve in a four stroke cycle petrol engine __________

A) opens at 50º before bottom dead center and closes at 15º after top dead center B) opens at bottom dead center and closes at top dead center
C) opens at 50º after bottom dead center and closes at 15º before top dead center D) may open or close anywhere
 
Answer & Explanation Answer: A) opens at 50º before bottom dead center and closes at 15º after top dead center

Explanation: The exhaust valve in a four stroke cycle petrol engine opens at 50º before bottom dead center and closes at 15º after top dead center while the inlet valve, opens at 20º before top dead center and closes at 40º after bottom dead center.

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12
Q:

In a four stroke cycle petrol engine, the expansion __________

A) starts at top dead center and ends at bottom dead center B) starts at 30º before top dead center and ends at 50º before bottom dead center
C) starts at 30º after top dead center and ends at 50º after bottom dead center D) may start and end anywhere
 
Answer & Explanation Answer: B) starts at 30º before top dead center and ends at 50º before bottom dead center

Explanation: In a four stroke cycle petrol engine, the expansion starts at 30º before top dead center and ends at 50º before bottom dead center while the compression starts at 40º after bottom dead center and ends at 30º before top dead center.

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13
Q:

In a four stroke cycle petrol engine, the charge is ignited at __________

A) 30º before top dead center B) 30º after top dead center
C) 30º before bottom dead center D) 30º after bottom dead center
 
Answer & Explanation Answer: A) 30º before top dead center

Explanation: None.

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18
Q:

In a four stroke cycle petrol engine, the compression __________

A) starts at 40º after bottom dead center and ends at 30º before top dead center B) starts at 40º before bottom dead center and ends at 30º after top dead center
C) starts at bottom dead center and ends at top dead center D) may start and end anywhere
 
Answer & Explanation Answer: A) starts at 40º after bottom dead center and ends at 30º before top dead center

Explanation: None.

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17
Q:

In a four stroke cycle petrol engine, the inlet valve __________

A) opens at top dead center and closes at bottom dead center B) opens at 20º before top dead center and closes at 40º after bottom dead center
C) opens at 20º after top dead center and closes at 20º before bottom dead center D) may open or close anywhere
 
Answer & Explanation Answer: B) opens at 20º before top dead center and closes at 40º after bottom dead center

Explanation: None.

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15