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.

0.15 kg

0.2 kg

0.25 kg

0.3kg

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

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

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

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

7. Most high speed compression engines operate on __________________?

Diesel cycle

Otto cycle

Dual combustion cycle

Special type of air cycle

Air aione

Air and fuel

Air and lub oil

Fuel alone

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

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

12. A heat engine utilises the_________________?

Calorific value of oil

Low heat value of

High heat value of oil

Mean heat value of oil

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

14. The term scavenging is generally associated with______________________?

2-stroke cycle engines

4-stroke cycle engines

Aeroplane engines

Diesel engines

High efficiency engines

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

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