I.C. Engines Mcqs
This set of Mechanical engineering Multiple Choice Questions & Answers (MCQs) focuses on study of “ Integrated Circuit Engines ”. These questions are chosen from a collection of most authoritative and best reference books on Mechanical engineering. Our aim is to prepare an individual for competitive exams like NTS, GAT, ECAT, University and College entrance exams, Jobs and interviews. One should practice our MCQS to assimilate I.C. Engines comprehensively.
2. The inlet value of a four stroke cycle I.C engine remains open for nearly___________________?
180°
125°
235°
200°
3. If one cylinder of a diesel engine receives more fuel than the others, then for that cylinder the________________?
Exhaust will be smoky
Piston rings would stick into piston grooves
Exhaust temperature will be high
Engine starts overheating
Scavenging occurs
Answer & Solution
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4. It the temperature of intake air in IC engines is lowered, then its efficiency will_______________________?
Increase
Decrease
Remain same
Increase upto certain limit and then decrease
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5. For the same compression ratio_____________________?
Otto cycle is more efficient than the Diesel
Diesel cycle is more efficient’than Otto
Both Otto and Diesel cycles are, equally efficient
Compression ratio has nothing to do with efficiency
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6. As a result of detonation in an I.C. engine, following parameter attains very high value _____________________?
Peak pressure
Rate of rise of pressure
Rate of rise of temperature
Peak temperature
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7. Most high speed compression engines operate on __________________?
Diesel cycle
Otto cycle
Dual combustion cycle
Special type of air cycle
Answer & Solution
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8. Which of the following medium is compressed in a Diesel engine cylinder __________________?
Air aione
Air and fuel
Air and lub oil
Fuel alone
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9. In a typical medium speed, 4-stroke cycle diesel engine ___________________?
Fuelinjection starts at 10° before to dead center and ends at 20° after tor dead center
Fuel injection starts at top dead center and ends at 20° after top dead center
Fuel injection starts at just before top dead center and ends just after top deac center
May start and end anywhere
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10. In diesel engine the diesel fuel injected into cylinder would burn instantly at about compressed air temperature of____________________?
250°C
500°C
1000°C
150CPC
11. The rating of a diesel engine, with increase in airintlet temperature, will ___________________?
Increase linearly
Decrease linearly
Increase parabolically
Decrease parabolically
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12. A heat engine utilises the_________________?
Calorific value of oil
Low heat value of
High heat value of oil
Mean heat value of oil
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13. Fuel consumption of diesef engines is not guaranteed at one quarter load because at such low loads________________?
The friction is high
The friction is unpredictable
The small difference in cooling water temperature or in internal friction has a disproportionate effect
The engine is rarely operated
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14. The term scavenging is generally associated with______________________?
2-stroke cycle engines
4-stroke cycle engines
Aeroplane engines
Diesel engines
High efficiency engines
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15. The cam shaft of a four stroke I.C. engine running at 1500 rmp will run at __________________?
1500 rpm
750 rpm
3000 rpm
Any value independent of engine speed