Internal Combustion Engines (I.C. Engines)

This is an MCQ-based quiz on the topic of Internal Combustion Engines (I.C. Engines).

This includes What is IC engines and components of IC engine, IC engine terminology, classification of IC engines, comparison of Two-stroke &four stroke engines, Comparison between SI & CI engines, valve and port timing diagram, and many more.

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The two reference fuels used for cetane rating are

Cetane and iso-octane Cetane and alpha-methyl naphthalene Cetane and normal heptane Cetane and tetra ethyl lead

For the same power developed in I.C. engines, the cheaper system is

Naturally aspirated Supercharged Centrifugal pump Turbo charger

The expansion of fuel in a four stroke cycle diesel engine

Starts at 15° before top dead center and ends at 30° after top dead center Starts at top dead center and ends at 30° after top dead center Starts at 15° after top dead center and ends at 30° before bottom dead center May start and end anywhere

As compared to air standard cycle, in actual working, the effect of variation in specific heats is to

Increase maximum pressure and maximum temperature Reduce maximum pressure and maximum temperature Increase maximum pressure and decrease maximum temperature Decrease maximum pressure and increase maximum temperature

The fuel valve in a four stroke cycle diesel engine

Opens at 15° after top dead center and closes at 20° before bottom dead center Opens at 15° before top dead center and closes at 20° after top dead center Opens at top dead center and closes at bottom dead center May open and close anywhere

The maximum temperature in the I.C. engine cylinder is of the order of

500-1000°C 1000-1500°C 1500-2000°C 2000-2500°C

For maximum power generation, the air fuel ratio for a petrol engine for vehicles, is of the order of

9 : 1 12 : 1 15 : 1 18 : 1

The theoretically correct air fuel ratio for petrol engine is of the order of

6: 1 9: 1 12: 1 15: 1

In petrol engines, the delay period is of the order of

0.001 second 0.002 second 0.003 second 0.004 second

The inlet value of a four stroke cycle I.C engine remains open for nearly

180° 125° 235° 200°

Indicated power of a 4-stroke engine is equal to ___________

4pLAN pLAN/2 pLAN 2pLAN

The thermal efficiency of diesel engines is about ___________

65% 50% 80% 70%

What is the firing order of a six stroke I.C. engine?

1-5-3-4-2-6 1-3-6-5-2-4 1-4-2-5-6-3 1-6-2-5-4-3

The number of holes in a multi-hole nozzle, varies from ___________

4 to 8 4 to 18 4 to 12 none of the mentioned

Which of the following factors affecting combustion in the CI engine?

Intake temperature

Jacket water temperature

Compression ratio

All of the mentioned

Formation of ice on the _____________ plate is eliminated in electronic fuel injection.

Engine

Throttle

Nozzle

None of the mentioned

Gasoline engines are _____________ than diesel engines.

Lighter

Unpredictable

Heavier

None of the mentioned

Which are the most important requirements of an automobile carburetor?

Ensuring full torque at low speeds

Good fuel economy

Absence of racing of the engine under idling conditions

All of the mentioned

The major loss in a S.I. engine is due to ____________

Variation in specific heat and chemical equilibrium

Pumping

Exhaust blow down

Incomplete combustion

What is the combustion in spark ignition engine?

Heterogeneous

Laminar

Homogeneous

None of the mentioned

Quiz/Test Summary

Title: Internal Combustion Engines (I.C. Engines)

Questions: 20

Contributed by:

NEO Mon, Apr 04, 2022 07:01 AM UTC

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