MECHANIC DIESEL MULTIPLE CHOICE QUESTIONS (MCQ)

MECHANIC DIESEL MULTIPLE CHOICE                              QUESTIONS (MCQ)

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

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

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

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

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

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

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

a) Cam shaft

b) Crank shaft

c) Rocker Arm

d) Valve Guide

Answer:- a) Cam shaft

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

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

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

MECHANIC DIESEL MULTIPLE CHOICE QUESTIONS (MCQ)

    MECHANIC DIESEL MULTIPLE CHOICE                              QUESTIONS (MCQ)
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

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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

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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

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

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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

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The lower portion of piston is called as -

a) Sleeve

b) Skirt

c) Piston Land

d) Grooves

Answer:- b) Skirt

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

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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

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

cylinder diameter.

a) More

b) Less

c) Equal

d) None of these

Answer:- b) Less

Flywheel of a Diesel Engine

is made of ........

a) Wood

b) Aluminum

c) Brass

d) Steel

Answer:- d) Steel

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MECHANIC DIESEL MULTIPLE CHOICE QUESTIONS (MCQ)

MECHANIC DIESEL MULTIPLE CHOICE QUESTIONS (MCQ)

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
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Which of the following is a unit
 of pressure?
a) Kg/cm²
b) gama
c) Pie
d) Newton
Answer:- a) Kg/cm²

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
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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


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
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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

Heater plugs are used to warm up.......
a) Fuel pump
b) Feed pump
c) Injector
d) Combustion chamber
Answer:- d) Combustion chamber


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
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Piston is made of .................
a) Zinc Alloy
b) Aluminum Alloy
c)Copper Alloy
d) None of these
Answer:- b) Aluminum Alloy


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