२०१८ फ़ेब्रुअर्य एम्प्लोयबिलित्य स्किल्ल्स सेमेस्तेर १ इ ते इ म च क़ु

२०१८ फ़ेब्रुअर्य एम्प्लोयबिलित्य स्किल्ल्स  सेमेस्तेर १ इ ते इ म च क़ु

2016 JULY MECHANIC DIESEL THEORY SEMESTER - II

2016 JULY MECHANIC DIESEL THEORY SEMESTER - II

1. Morse test can be conducted

for  ........

(a) Petrol engines

b) Diesel engines

c) Multi cylinder engines

d) All of these

Answer:- c) Multi cylinder engines

2. Which of the following is a unit

 of pressure?

a) Kg/cm²

b) gama

c) Pie

d) Newton

Answer:- a) Kg/cm²

3. During the suction stroke of a

diesel engine ........

a) Petrol injected

b) Diesel injected

c) Diesel and air supplied

d) Only air supplied

Answer:- d) Only air supplied

4. In an automobile engine,

the temperature of piston will

be more at the ................
a) Piston pin

b) Skirt of piston

c) Crown of piston

d) Piston rings

Answer:- c) Crown of piston

5. In the compression stroke

the piston moves from ........

a)T.D.C to B.D.C

b) B.D.C. to T.D.C

c) Below B.D.C.

d) Above T.D.C.

Answer:- b) B.D.C. to T.D.C

6. Piston slap in a cold engine is

due to ..........

a) Excessive ring gap

b) Excessive piston to bore clearance
c) Less piston working clearance

d) Excessive compression pressure

Answer:- b) Excessive piston to bore clearance

7. Heater plugs are used to warm up.......

a) Fuel pump  

b) Feed pump

c) Injector

d) Combustion chamber

Answer:- d) Combustion chamber

8. In one revolution of a 2-stroke

engine of crank shaft, the inlet

value opens ............
a) 1 Time

b) 2Times

c) 3 Times

d) 4 Times

Answer:- a) 1 Time

9. Piston is made of .................

a) Zinc Alloy

b) Aluminum Alloy

c)Copper Alloy

d) None of these

Answer:- b) Aluminum Alloy

10. The knocking in the diesel engine occurs due to -

a) Ignition advance

b) Ignition delay

c) Ignition hold

d) None of these

Answer:- b) Ignition delay

11. The Petrol Engine works on

the principle of ..........

a) Otto Cycle

b) Diesel Cycle

c) Pascal Cycle

d) None of these

Answer:- a) Otto Cycle

12. Turbo charger in a Diesel

Engine is normally driven by ........
a)Inlet Air

b) Exhaust Gases

(c) Lub oil pump

 d) None of these

Answer:- b) Exhaust Gases

13. Oil should be checked -

a) Before starting the engine

b) During running of engine

c) Within two minute after

     stopping the engine

d) None of the above

Answer:- a) Before starting the engine

14. A spark plug gap is kept between -

a)  0.2 to 0.8mm

b)  0.3 to 0.7mm

c)  0.4 to 0.9 mm

d)  0.6 to 1.0 mm

Answer:- a)  0.2 to 0.8mm

15. Tappet clearance adjustment is

       carried out when ............

a) Both the inlet and exhaust valves are

     in shut position

b) Only inlet valve is in shut position

c) Only exhaust valve is in shut position

d) All of above

Answer:- a) Both the inlet and exhaust

valves are in shut position

16. The lower portion of piston is called as -

a) Sleeve

b) Skirt

c) Piston Land

d) Grooves

Answer:- b) Skirt

17. The petrol air mixture at starting of

an engine needs to be ............
a)  Lean

b)  Pure petrol

(c) Same as for normal running

d)  Rich

Answer:- d) Rich

18. Which of the following has

      finished surface?

a)Wet Liner

b) Dry Liner

c) Both (a) &(b)

d) None of these

Answer:- b) Dry Liner

19. Piston diameter is...........than

cylinder diameter.

a) More

b) Less

c) Equal

d) None of these

Answer:- b) Less

20. Flywheel of a Diesel Engine

is made of ........

a) Wood

b) Aluminum

c) Brass

d) Steel

Answer:- d) Steel

21. Which of the following engine

power is more power?

a) Internal Combustion Engine

b) External Combustion Engine

c) Both (a) &(b)

d) None of these

Answer:- a) Internal Combustion Engine

22. Engine valves are mounted ......

a) On Cylinder Block or Cylinder Head

b) Inside the cylinder
c) On crank case

d) None of these

Answer:- a) On Cylinder Block or Cylinder Head

23. Which of the following is used for

housing of crank shaft and cam shaft?
a)  Crank case

b)  Cylinder lining

c)  Piston ring

d)  Piston pin

Answer:- a)Crank case

24. Radiator of the which of engine is

small in size -

a) Petrol Engine

b) Diesel Engine

c) Both (a) &(b)

d) None of these

Answer:- a) Petrol Engine

25. Which of the engine has lesser

compression ratio?

a) Petrol Engine

b) Diesel Engine

c) Both (a) &(b)

d) None of these

Answer:- a) Petrol Engine

26. Which of the following is the part

of fuel feed system?
a) Fuel tank

b) Fuel filter

c) Fuel gauge

d) All of these

Answer:- d) All of these

27. Engine valves are opened by ...........

a) Cam shaft

b) Crank shaft

c) Rocker Arm

d) Valve Guide

Answer:- a) Cam shaft

28. In a petrol engine, if diesel is used,

 then the engine will ...........

a) Not run

b) Run more efficiently

c) Run at high speed

d) Explode

Answer:- a) Not run

29. What will happen due to abnormal

wear of oil ring of a piston?

a) High oil viscosity

b) More oil consumption

c) High oil pressure

d) Low pump pressure

Answer:- b) More oil consumption

30. The purpose of providing drain

plug in Air compressor is ............

a) To drain out oil

b) To drain out condensed water

c) To drain out air

d) To drain out coolant

Answer:- b) To drain out condensed water

31. Excessive valve guide wear will

result in ........

a) More oil consumption

b) Engine efficiency is

c) Perfect sealing oil valve

d) Increased valve life

Answer:- a) More oil consumption

32. The late opening of engine valve

 is termed as .........
a) Lead

b) Leg

c) Throw

d) Bore

Answer:- b) Leg

33. Internal diameter of cylinder is

called as .......

a) Bore

b).D.S.S.

c) B.D.S.

d) Lead

Answer:- a) Bore

34. The pressure inside the cylinder

is .............. the atmospheric pressure

during the exhaust stroke,
a) Equal to
b) Below

c) Above 

d) None of these

Answer:- c) Above 

35. The factors affecting knocking an

engine are .......

a) Compression ratio

b) Cold mixture

c) Additives

d) All of these

Answer:- d) All of these

36. Which is the type of muffler?

a) Baffle type

b) Resonance type

c) Wave cancellation type

d) All of these

Answer:- d) All of these

37. Radiators are generally made of ........

a) Brass and copper

b) Iron

c) Silver

d) Aluminum

Answer:- a) Brass and copper

38. If the temperature of intake air in

internal combustion engine increases,

then its efficiency will -

a) Remain same

b) Decrease

c) Increase

d) None of these

Answer:- b) Decrease

39. The expansion of fuel in a four

stroke cycle diesel engine ............

a) Starts at 15° before top dead center

and ends at 30° after top dead center

b) Starts at top dead center and ends

at 30° after top dead center

c) Starts at 15° after top dead center

and ends at 30° before bottom dead center

d) May start and end anywhere

Answer:- d) May start and end anywhere

40. The pressure at the end of compression

 in the case of diesel engine is of the

order of  .......
a)  6kg/cm²

b)  12kg/cm²
c)  20 kg/cm²

d)   35 kg/cm²

Answer:- a)  6kg/cm²

41. The operation of forcing additional

air under pressure in the engine

cylinder is known

as -

a) Scavenging

 b) Turbulence

c) Supercharging

d) Pre-ignition

Answer:- c) Supercharging

42. A diesel engine as compared to

petrol engine (both running and

rated load) is -

a) More efficient

 b) Less efficient

c) Equally efficient

d) Other factors will decide it

Answer:- a) More efficient

43. A diesel engine is ........ as compared

to petrol engine, both running at rated

load.

a) Equally efficient

b) Less efficient

c) More efficient

d) None of these

Answer:- c) More efficient

44. A higher compression ratio causes ............

a) Pre-ignition

b) Increase in detonation

c) Acceleration in the rate of combustion    

d) Any one of these

Answer:- d) Any one of these

45. The size of inlet valve of an engine in

comparison to exhaust valve is ........

a) More

b) Less

c) Same

d) More/less depending on capacity of engine

Answer:- a) More

46. Which is more viscous lube oil?

a) SEA 30

b) SAE 50

c) SAE 70

d) SAE 80

Answer:- d) SAE 80

47. The magneto in an automobile is

basically .............

a) Transformer

b) D.C. generator

c) Capacitor

d) Magnetic circuit

Answer:- b) D.C. generator

48. The output of a diesel engine

can be increased without increasing

the engine revolution or size in

following way ................

a) Feeding more fuel

b) Heating incoming air

c) Scavenging

d) Supercharging

Answer:- d) Supercharging

49. Diesel as compared to petrol is ......

a) Highly ignitable

b) More difficult to ignite

c) Less difficult to ignite

d) None of these

Answer:- b) More difficult to ignite

50. The colour of exhaust from

diesel engine is generally ............
a) White

b) Bluish

c) Black

d) Violet

Answer:- c) Black