Internal Combustion Engines (IC engine) MCQ Mechanical Engineering

Attempt now to check your rank among 25 students! 50 Questions 30 Mins

About Internal Combustion Engines (IC engine)

Internal combustion engines are devices that use burning fuel to create power. This power is then used to turn the gears of a car, truck, or motorcycle. Internal combustion engines have been around for centuries, and they are still some of the most popular ways to create power.

There are many benefits to using internal combustion engines, including: -

  • They are very efficient
  • They create a lot of power
  • They are easy to maintain

If you are looking for a reliable and efficient way to create power, an internal combustion engine is a great option. Internal combustion engines have many benefits that make them a great choice for many applications. An internal combustion engine is a device that uses a burning fuel to create power. This power is then used to turn the gears of a car, truck, or motorcycle. Internal combustion engines have been around for centuries, and they are still some of the most popular ways to create power.

Wrapping Up

Internal combustion engines have many benefits that make them a great choice for many applications. If you are looking for a reliable and efficient way to create power, an internal combustion engine is a great option.

Following are some of the multiple choice questions on the Internal Combustion Engines (IC engine) with answers that will help the students in developing their knowledge.

Internal Combustion Engines (IC engine) MCQ

1. A moderator generally used in nuclear power plants is

  • graphite
  • heavy water
  • concrete
  • graphite and concrete

2. The primary fuel used in nuclear power plants is

  • U235
  • U238
  • Pu239
  • Pu233

3. In a four stroke cycle petrol engine, the compression

  • Starts at 40° after bottom dead centre and ends at 30° before top dead centre
  • Starts at 40° before bottom dead centre and ends at 30° after bottom dead centre
  • Starts at bottom dead centre and ends at top dead centre
  • May start and end anywhere

4. In compression ignition engines, swirl denotes a

  • Haphazard motion of the gases in the chamber
  • Rotary motion of the gases in the chamber
  • Radial motion of the gases in the chamber
  • None of the above

5. Fuel oil consumption guarantees for I .C. engine are usually based on

  • Low heat value of oil
  • High heat value of oil
  • Net calorific value of oil
  • Calorific value of fuel

6. The fuel air ratio in a petrol engine fitted with suction carburettor, operating with dirty air filter as compared to clean filter will be

  • Higher
  • Lower
  • Remain unaffected
  • None of the above

7. Nuclear reactors are used

  • to produce heat for thermoelectric power
  • to produce fissionable material
  • to propel ships, submarines, aircrafts
  • all of these

8. The exhaust valve in a four stroke cycle petrol engine

  • opens at 50° before bottom dead centre and closes at 15° after top dead centre
  • opens at bottom dead centre and closes at top dead centre
  • opens at 50° after bottom dead centre and closes at 15° before top dead centre
  • may open and close anywhere

9. The predominent isotope of the naturally occuring element is

  • U235
  • U238
  • Pu233
  • Pu239

10. In diesel engines, the fuel is injected in the form of very fine spray, into the engine cylinder, which gets ignited due to high temperature of the compressed air.

  • Agree
  • Disagree

11. Pre-ignition is caused by the spontantaneous combustion of the mixture before the end of the compression stroke, and is due to

  • cylinder walls being too hot
  • overheated spark plug points
  • red hot carbon deposits on cylinder walls
  • any one of these

12. The expansion of fuel in a four stroke cycle diesel engine

  • starts at 15° before top dead centre and ends at 30° after top dead centre
  • starts at top dead centre and ends at 30° after top dead centre
  • starts at 15° after top dead centre and ends at 30° before bottom dead centre
  • may start and end anywhere

13. In a diesel engine, the duration between the time of injection and ignition, is known as

  • pre-ignition period
  • delay period
  • period of ignition
  • burning period

14. Reactors for propulsion applications are designed for

  • any form of uranium
  • natura uranium
  • enriched uranium
  • plutonium

15. In open combustion chamber in diesel engines, the shape and layout of the piston crown, the inlet port and the valve produce the turbulent effect of fuel mixture.

  • True
  • False

16. Each fission of U235 produces on the average __________ fast neutrons as a product of reaction.

  • 2.46
  • 24.6
  • 246
  • 2460

17. The pressure at the end of compression in the case of diesel engine is of the order of

  • 12 kg/cm
  • 35 kg/cm
  • 20 kg/cm
  • 6 kg/cm

18. The air standard efficiency of an I.C. engine depends on (A) Fuel used

  • Compression ratio
  • Fuel used
  • Speed of engine
  • None of these

19. The ratio of the indicated thermal efficiency to the air standard efficiency is known as

  • Volumetric efficiency
  • Relative efficiency
  • Overall efficiency
  • Mechanical efficiency

20. The compression ignition engines are governed by

  • Qualitative governing
  • Hit and miss governing
  • Quantitative governing
  • None of these

21. It the temperature of intake air in IC engines is lowered, then its efficiency will

  • Decrease
  • Increase
  • Remain same
  • Increase up to certain limit and then decrease

22. The probability of knocking in diesel engines is increased by -

  • High self ignition temperature
  • Low volatility
  • Higher viscosity
  • All of these

23. The ignition quality of petrol is expressed by -

  • Octane number
  • Cetane number
  • Calorific value
  • All of these

24. In a four stroke cycle petrol engine, the inlet valve

  • Opens at top dead center and closes at bottom dead center
  • Opens at 20° before top dead center and closes at 40° after bottom dead center
  • Opens at 20° after top dead center and closes at 20° before bottom dead center
  • May open or close anywhere

25. The temperature of interior surface of cylinder wall in normal operation is not allowed to exceed

  • 80°C
  • 120°C
  • 180°C
  • 240°C

26. The secondary fuel used in nuclear power plants is

  • U233 and Pu239
  • U235 and Th232
  • U235 and Pu238
  • U233 and Pu238

27. The method of determination of indicated power of a multi cylinder spark ignition engine is by the use of

  • Morse test
  • Prony brake test
  • Motoring test
  • Heat balance test

28. The thermal efficiency of a petrol engine is _________ as compared to diesel engine.

  • Less
  • Same
  • More
  • None of these

29. Scavenging air in diesel engine means

  • Forced air for cooling cylinder
  • Air used for combustion sent under pressure
  • Burnt air containing products of combustion
  • Air used for forcing burnt gases out of engine's cylinder during the exhaust period

30. The knocking tendency in compression ignition engines for a given fuel will be

  • Enhanced by increasing compression ratio
  • Enhanced by decreasing compression ratio
  • Dependent on other factors
  • None of the above

31. The process of breaking up or a liquid into fine droplets by spraying is called

  • Carburetion
  • Atomization
  • Ionization
  • Vaporisation

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

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

33. High speed compression engines operate on

  • Otto cycle
  • Diesel cycle
  • Dual-combustion cycle
  • all of these

34. The injection pressure in a diesel engine is about

  • 10 bar
  • 100 bar
  • 150 bar
  • 500 bar

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

  • Agree
  • Disagree

36. The basic requirement of a good combustion chamber is

  • minimum turbulence
  • low compression ratio
  • high thermal efficiency and power output
  • low volumetric efficiency

37. The energy released during the fission of one atom of Uranium - 235 in million electron volts is about

  • 100
  • 200
  • 300
  • 400

38. The pre-ignition occurs before the spark is produced whereas detonation develops after the introduction of spark.

  • Agree
  • Disagree

39. The detonation is also called knocking or pinking.

  • Yes
  • No

40. U233 is produced

  • artificially
  • as basic raw material
  • when thorium is irradiated by neutrons
  • by fission of U238

41. A carburettor is used to supply

  • petrol, air and lubricating oil
  • air and diesel
  • petrol and lubricating oil
  • petrol and air

42. The increase of cooling water temperature in petrol engine will __________ the knocking tendency.

  • not effect
  • decrease
  • increase
  • none of the above

43. The pressure inside the cylinder is __________ the atmospheric pressure during the exhaust stroke.

  • equal to
  • below
  • above
  • none of the above

44. The self ignition temperature of petrol is __________ as compared to diesel oil.

  • same
  • lower
  • higher
  • none of the above

45. A diesel engine has

  • one valve
  • two valves
  • three valves
  • four valves

46. The effective inhibitor of pre-ignition is

  • alcohol
  • water
  • lead
  • none of these

47. The compensating jet in a carburettor supplies almost constant amount of petrol at all speeds because the

  • jet area is automatically varied depending on the suction
  • the flow from the main jet is diverted to the compensating jet with increase in speed
  • the diameter of the jet is constant and the discharge coefficient is invariant
  • flow is produced due to the static head in the float chamber

48. In petrol engine, using a fixed octane rating fuel and fixed compression ratio, supercharging will __________ the knocking tendency.

  • not effect
  • decrease
  • increase
  • none of the above

49. The detonating tendency in petrol engines increases with increase of compression ratio.

  • True
  • False

50. Where reactor operation is designed with fast neutrons such as in reactors using highly enriched fuel, the moderator used is

  • heavy water
  • graphite
  • carbon dioxide
  • no moderator is needed

Enjoyed the Quiz. Share this with friends

Comments

Add Your Review

Your email address will not be published.

Subscribe to Newsletter!

Subscribe to get latest updates and information.