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IMP MCQ AUTOMOBILE

IMP MCQ AUTOMOBILE

 

 

1.      Aeroplan is not Automobile.

 


2.      Roads and wheels have tractive force.



3.      Road and tyre have Rolling resistance.

4.      Petrol Engine works on Otto cycle.



5.      Diesel engine works on diesel cycle (Combustion: constant pressure).













6.      Power inside the engine known as indicated power.



7.      In squaretype engine stock length and cylinder bore are same.



8.      Compression ratio in petrol engine - 8:1, Diesel engine-15-25:1



9.      Gasket- prevents the gases to leak from joints.



10.   Cylinder block are made from cast iron and aluminium alloy.

11.   Cylinder sleeve made from cast iron.

12.   Cylinder sleeve used to resist wear.



13.   Honing- a cross section hatch pattern



14.   Reconditioning process used to give cylinder bore surface a cross section hatch patter is also known as honing.



15.   Balancer shaft used to reduce the vibration caused by crank shaft rotation.



16.   Stock: IDC to BDC.



17.   Two type of piston ring, 1.compression ring  2. Oil control ring.



18.   Crescend shape cavity on piston head is valve recess.



19.   Connecting road I-section cross section by connect journal.



20.   4 stock engine valve overlap 30.



21.  Petrol vaporised is by property of volatility.

22.   Iso-octane: C8h18

23.   Octan no. petrol: 85-95

24.   Cetane no. od diesel : 45

25.   Cv: 42.7-43.5 (Petrol) Kj/kg

26.   Cv: 42.5 (diesel) Kj/kg

27.   Specific gravity: 0.75 (petrol)

28.   Specific Gravity: 0.85 (Diesel)

29.   Boiling point : 180-360 C (diesel)

30.   Cetane no. of diesel is measured of delay period.

31.   Octan no. CNG: 120

32.   Natural gas compressed in CNG cylinder at 200bar.

33.   N heptane : denotates easily

34.   Rich air-fuel ration- 10:1

35.   Firing order in line IC engine: 1-3-4-2

36.   Firing order opposed cylinder : 1-4-3-2

37.   Diesel engine required bigger flywheel.



38.   Valve tappet clearance measured by : feeler gauge.



39.   Amyl nitrate improves antiknock properties.

40.   Spark plug: 22Kwatts



41.   If spark plug become black means its too rich mixture.



42.   Misfiring – sark plug gap too wide.



43.   Baffle plats prevent splashing.



44.   SAE 80 more viscus.

45.   SAE 80 W-50 is multi grade oil.

46.  anti-freeze: ethylene glycol.



47.   Thermostat – engine worm quickly.



48.   Resonator – reduce intake air noise.



49.   Muffler- reduces exhaust noise.



50.   12 volt car battery have 6 cells.



51.   Battery has sulphuric acid.

52.   Specific gravity in battery checked by hydrometer.



53.   Specific gravity when its full: 1.28

54.   Specific gravity when its half: 1.19

55.   + lead peroxide (pbo2)

56.   -spongy lead (pb)

57.   Discharge – lead sulphate pdso4

58.   Maintenance free battery – lead calcium plate grid.

59.   Tachometer to measure engine RPM.



60.   Co-efficient of friction of clutch: 6-4.

61.   Clutch facing usually attached to plate by brass rivets.

62.   Free pedal in car : 25 mm


mech

63.   Corning different speed in left & right wheel.



64.   2 speed gear box- tractor.

65.   Vulcanising – heating the rubber under pressure.

66.   Bead wire- steel

67.   Camber – tilting vertically by weight.

68.   Caster- direction control

69.   DOT4, DOT3 , DOT4 is higher boiling point.

70.   Crank shaft which rest on block: main journal.

71.   D alembart law depends second law of Newton

p-ma=0

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