IC Engine Questions and Answers – Actual Cycle

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This set of IC Engines Multiple Choice Questions & Answers (MCQs) focuses on “Actual Cycle”.

1. Time loss factor in Actual Cycle is due to ____________
a) progressive combustion
b) heat loss through cylinder walls
c) gas leakage
d) friction
View Answer

Answer: a
Explanation: None.
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2. If the spark timing is at TDC, the work is ____________
a) more
b) less
c) equal
d) none of the mentioned
View Answer

Answer: b
Explanation: If the spark timing is at TDC, the work is less as the peak pressure is low.

3. When the spark is advanced, the work output is less as ____________
a) the peak pressure is low
b) the peak temperature is low
c) additional work is required to compress the burning gas
d) frictional losses increase
View Answer

Answer: c
Explanation: When the spark is advanced, the work output is less as additional work is required to compress the burning gas.
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4. Optimum spark timing gives ____________
a) higher mean effective pressure
b) higher efficiency
c) higher mean effective pressure and higher efficiency
d) none of the mentioned
View Answer

Answer: c
Explanation: None.

5. The major loss in a S.I. engine is due to ____________
a) exhaust blow down
b) pumping
c) incomplete combustion
d) variation in specific heat and chemical equilibrium
View Answer

Answer: d
Explanation: The major loss in a S.I. engine is due to variation in specific heat and chemical equilibrium while the major loss in a C.I. engine is loss due to incomplete combustion.
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6. What is the major loss in a C.I. engine?
a) direct heat loss
b) loss due to incomplete combustion
c) rubbing friction loss
d) pumping loss
View Answer

Answer: b
Explanation: None.

7. In an actual S.I engine the pumping loss with respect to speed ____________
a) increases
b) decreases
c) remains same
d) none of the mentioned
View Answer

Answer: b
Explanation: None.
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8. The volumetric efficiency is affected by ____________
a) the exhaust gas in the clearance volume
b) the design of intake and exhaust valve
c) valve timing
d) all of the mentioned
View Answer

Answer: d
Explanation: None.

9. In petrol engine the actual pressure developed compared to the predicted maximum pressure is?
a) 90%
b) 70%
c) 50%
d) 25%
View Answer

Answer: c
Explanation: In petrol engine the actual pressure developed compared to the predicted maximum pressure is 50% while energy released in actual cycle is about 90% of the fuel input.
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10. Energy released in actual cycle is about _____________ of the fuel input.
a) 90%
b) 70%
c) 50%
d) 25%
View Answer

Answer: a
Explanation: None.

Sanfoundry Global Education & Learning Series – IC Engine.

To practice all areas of IC Engine, here is complete set of 1000+ Multiple Choice Questions and Answers.

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Manish Bhojasia - Founder & CTO at Sanfoundry
Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He is Linux Kernel Developer & SAN Architect and is passionate about competency developments in these areas. He lives in Bangalore and delivers focused training sessions to IT professionals in Linux Kernel, Linux Debugging, Linux Device Drivers, Linux Networking, Linux Storage, Advanced C Programming, SAN Storage Technologies, SCSI Internals & Storage Protocols such as iSCSI & Fiber Channel. Stay connected with him @ LinkedIn | Youtube | Instagram | Facebook | Twitter