MECHANIC MOTOR VEHICLE

MECHANIC MOTOR VEHICLE

Which of the following is not true for internal combustion
engine as compare to external combustion engine?

a. It has lower ratio of weight to output

b. They are self-starting

c. Higher overall efficiency

d. Mechanical simplicity

Answer : b. They are self-starting

Which of the following is not an internal Combustion (IC) engine?

a. Gas engine

b. Wankel engine

c. Jet engine

d. Sterling engine

Answer : d. Sterling engine

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In two stroke engine there is one power stroke in_of crankshaft rotation.

a.  90°

b. 180°

c. 270°

d. 360°

Answer : d. 360°

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In four stroke engine which of the following is also known as power stroke-

a. Suction stroke

b. Compression stroke

c. Expansion stroke

d. Exhaust stroke

Answer : c. Expansion stroke

Thermal stress in cylinder liners can be reduced by……..

a. Increasing the wall thickness of cylinder liner

b. Increasing velocity of flowing water through jacket

c. Both(a)&(b)

d. None of the above

Answer : b. Increasing velocity of flowing water through jacket

Exhaust valve diameter is_intake valve.

a. Greater than

b. Same as

c. Smaller to

d. Double to

Answer : c. Smaller to

Piston slap results from excessive clearance berween ….

a. Piston and cylinder wall

b. Piston and piston pin

c. Piston and piston

d. Piston rings

Answer : a. Piston and cylinder wall

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The connecting rod attaches the piston to. The ……

a. Cylinder head

b. Crankshaft

c. Camshaft

d. Driveshaft

Answer : b. Crankshaft

Piston rings are made of-

a. Cast iron

b. Brass

c. Copper

d. Both (a) & (b)

Answer : a. Cast iron

On which two strokes are both valves closed?

a. Intake and exhaust

b. Intake and compression

c.   Compression and power

d.   Power and exhaust

Answer : c.   Compression and power

What is the material of the connecting rod-

a. Mild steel .

b. Forged steel

c. Tool steel

d. Cast iron

Answer : b. Forged steel

Fly wheel is installed on -

a. Crank shaft

b. Cam shaft

c. Both (a) & (b)

d. None of these

Answer : a. Crank shaft

Hydrocarbons are decomposed into smaller hydrocarbons by ….

a. Reforming

b. Refining

c. Cracking

d. Polymerization

Answer : c. Cracking

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Which of the following isn't a cylinder block part?

a. Cylinder in which piston slides up and down

b. Openings for valves

c. Passages for flow of cooling water

d. Carburettor

Answer : d. Carburettor

A machine member used to connect engine shaft to gear box is called

a. Differential

b. Clutch

c. Flywheel

d. Propeller shaft

Answer : b. Clutch

A gas turbine works on which cycle?

a. Carnot.     .       ..

b. Brayton

c. Dual cycle

d. Rankine cycle

Answer : b. Brayton

Which among these is the main component of a gas turbine plant?

a. Condenser 

b. Compressor

c. Boiler

d. Both (b) & (c)

Answer : b. Compressor

The gasoline engine works on which cycle?

a. Otto cycle

b. Diesel cycle

c. Brayton cycle

d. None of these

Answer : a. Otto cycle

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The turbocharged diesel'ehgine requires ……….. cooling air

than naturally aspired diesel engines.

a. Less

b. More

c. Equal

d. None of these

Answer : b. More

Which of the following is true in radiator …………

a. Relatively small amount of water are brought into

contact with large surface areas of metal

b. Relatively large amount of water are brought into

contact with small surface areas ot metal

c. Equal amount of water are brought into contact

with equal surface areas ot metal

d. Anv of  the above

Answer : a

A typical cooling system circuit has the thermostat between …..

a. Engine outlet and radiator

b. Radiator outlet and engine inlet

c. Both (a) & (b)

d. None of these

Answer : a. Engine outlet and radiator

Lubricating oil ………..

a. Minimizes wear in moving parts 

b. Helps in keeping the parts cool .     

c. Washes away and carries away

d. All of these

Answer : d. All of these

Viscosity index (VI) is a measure for the change of  

viscosity with change in ………

a. Temperature

b. Pressure

c. Volume

d. All of these

Answer : a. Temperature

The following part is not lubricated by Pressure feed system …..

a. Timing gears

b. Valve rods and Push rods

c. Rocker arms

d. Main bearings of crankshaft

Answer : b. Valve rods and Push rods

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Supercharging -

a. Increases intake pressure

b. Increases intake temperature

c. Increases flame speed

d. All of these

Answer : d. All of these

Turbochargers are generally-

a. Centrifugal compressors

c. Vane blowers

b. Reciprocating compressors       

d. Roots blower

Answer : a. Centrifugal compressors

In which of the following compressors,

a slip coupling is used between the engine

and compressor for the variable speed

operations of the engines?

a. Piston cylinder type

b  Root blower

c. Vane type blower

d. Centrifugal compressor

d. Centrifugal compressor

If  the temperature of intake air in I.C. engine is

lowered, then its efficiency will ………..

a. Increase

b. Decrease

c  Remain same

d.   No effect

Answer : a. Increase

Air fuel ratio for idling speed of a petrol engine is approximately …

a. 1:1

b. 5:1

c. 10:1

d. 15:1

Answer : c. 10:1

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A muffler between the exhaust manifold and

 the end of the exhaust pipe causes …………..

a. A decrease in exhaust gas pressure

b. An increase in exhaust gas pressure

c. No change in exhaust gas pressure

d. Either (a) or (b) .

Answer : b. An increase in exhaust gas pressure

The air fuel ratio of the petrol engine is controlled by ……….

a. Fuel pump

b. Governor 

c. Injector

d. Carburettor

Answer : d. Carburettor

In a diesei engine, the fuel is ignited by-

a. Spark

b. Injected fuel

c. Heat resulting from compressing air that is supplied for combustion

d. Ignition

Answer : c

ECU enabled electronic injection system is used for -

a. Calculating the appropriate injection timing

b. Meeting only certain operating conditions

c. Closing the injection valve only

d. None of the above

Answer : . None of the above

Scavenging air in diesel engine means -

a. Air used for combustion sent under pressure

b. Forced air for cooling cylinder

c. Burnt air containing products of combustion

d. Air used for forcing burnt gases out of engines

cylinder during the exhaust period

Answer : d

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Fuel is injected in a four-stroke CI engine-

a. At the end of suction stroke

b. At the end of expansion stroke

c. At the end of compression stroke

d. At the end of exhaust stroke

Answer : c. At the end of compression stroke

……….. of fuel is independent of cranking speed and

therefore starting will be easier,
a. Ignition

b. Atomization

c. Condensation

d.  None of these

Answer : b. Atomization

When the engine is cold, the  ………….. plate

will be in closed position.

a. Nozzle

b. Throttle

c. Air

d. None of these

Answer : b. Throttle

Fugitive emissions consist of-

a. Street dust

b. Dust from construction activities

c. Dust from farm cultivation

d. All of these

Answer : d. All of these

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The function of automobile catalytic converter is to

control emissions of-

a. Carbon dioxide and hydrogen

b. Carbon monoxide and hydrogen

c. Carbon monoxide and carbon dioxide

d. Carbon monoxide and nitrogen dioxide

Answer : d . Carbon monoxide and nitrogen dioxide

Gaseous pollutants include-

a. Biological decay

b. Forest fires

c. Volcanic eruptions

d. All of these

Answer : d. All of these

An alternator is also called ……….

a. Synchronous generator

b. Turbo generator

c. Asynchronous generator

d. Generator

Answer : a. Synchronous generator

To get a maximum output current, IC regulation

are provided with

a. Radiation source

b. Heat sink

c. peak detector                                                                                                                                                                           d. None of these                                                                                                                                                                   Answer : b. Heat sink

3 - point starter is used to start the ……..  

a. Series motor

b. Shunt motor

c. Compound motor                                                                                                                                                                    d. only (b)and (c)                                                                                                                                                                        Answer : d. only (b)and (c)

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The full form of MPF1 is ……….
a. Multi Point Fuel Injection
b. Multi Piston Fuel Injection

c. Main Point Fuel Injection

d. Multi Point Fuel Ignition

Answer : a. Multi Point Fuel Injection

EGR stands for -

a. Exhaust Gas Recirculation

b. Engine Gas Recirculation

c. Engine Gas Recycling

d. Exhaust Gas Re-injection

Answer : a. Exhaust Gas Recirculation

To prevent overload and overheating of wires-

a. Fuses are used only

b. Circuit breakers are used only

c. Fuses and circuit breakers are used

d. Fuses and resistor are used

Answer : c. Fuses and circuit breakers are used

The effects of  knocking are ……..

a. Noise and roughness

b. Mechanical damage .  

c. Carbon deposits

d   Allot these

Answer: a. Noise and  roughness

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A hydraulic coupling belongs to the category of ………

a. Power absorbing machines

b. Energy transfer machines

c. Power developing machines

d. Energy generating machines

Answer: d. Energy generating machines

In water cooling, the water in the jackets obtains heat from the.

Cylinders due to-
a. Conduction

b. Convection

c. Radiation                                                                                                                                                                                d. All of these

Answer: a. Conduction

Which of the following is the most abundant hydrocarbon

which is emitted into the atmosphere by biological activity?

a. Ethane

b. Methane

c. Poly Aromatic hydrocarbons

d. Pentane

Answer: b. Methane

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The clutch cover is bolted to ….
a. Fly wheel
b. Car frame
c. Engine block                                                                                                                                          d. Clutch disc                                                                                                                                              Answer: a. Fly wheel

The following provides a smooth means of
disengagement and engagement between the
engine and the remainder of transmission system-
a. Clutch
b. Gearbox
c. Propeller shaft
d. Differential
Answer: a. Clutch

The torque which a clutch can transmit, depends upon the-
a. Coefficient of friction
b. Spring force
c. Contact surfaces
d. All of these
Answer: d. All of these
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Mechanical transmission can be of following class(es) ….
a. Clutch, gearbox and live axle transmission
b. Clutch, gearbox and dead axle transmission
c. Clutch, gearbox and axle less transmission .
d. All of the above
Answer: d. All of the above

Which type of gear box is used in automobiles?
a. Sliding mesh gear box
b. Differential gear box
c. Synchromesh g
d. All of these
Answer: d. All of these

Four-wheel drive vehicles have differential at …..
a. Front wheels
b. Rear wheels
c. Both the front and rear wheels
d. Any of the front or rear wheels
Answer: c. Both the front and rear wheels


The differential unit consists …….
a. One bevel pinion
b. Two bevel pinion
c. Three bevel pinion
d. Four bevel pinion
Answer: b. Two bevel pinion

Which of the following is a higher pair?
a. Turning pair
b. Screw pair
c. Belt and pulley
d. None of these
Answer: c. Belt and pulley
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For a simple gear train, velocity ratio is the ratio of ……………
a. Speed of driving shaft and speed of driven shaft
b. Speed of driven shaft and speed of driving shaft
c. Speed of driven shaft and (speed of driving shaft + speed of idler gears)
d. Speed of driving shaft and (speed of driven shaft + speed of idler gears)
Answer: b. Speed of driven shaft and speed of driving shaft


In a simple gear train, if the number of idle gears is odd, then the motion of driven gear will-
a. Be same as that of driving gear
b. Be opposite as that of driving gear
c. Depend upon the number of teeth on the driving gear
d. None of the mentioned
Answer: a. Be same as that of driving gear

To connect two parallel and coplanar shafts the following type of gearing is used-
a. Spur gear
b. Bevel gear
c. Spiral gear
d. None of these
Answer: a. Spur gear

In which of the following type of gear train the first gear and the last gear are co-axial.
a. Simple gear train
b. Compound gear train
c. Reverted gear train
d. None of these
Answer: c. Reverted gear train
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Transfer case is located next to the gearbox in …..
a. Front wheel drive
b. Rear wheel drive
c. Four wheel drive
d. All of these
Answer: c. Four wheel drive

Which of the following is not an example of recuperations' type heat exchanger?
a. Automobile radiators
b. Condensers
c. Chemical factories
d. Oil heaters for an aero
Answer: c. Chemical factories

In Disc clutch, the clutch disc acts as a ……
a. Driving member
b. Driven member
c. Neutral member
d. Any of these
Answer: b. Driven member
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The following components forms valve operating mechanism except …..
a. Push rod .  .
b. Rocker arm
c. Valve seat
d. Fork
Answer: d. Fork

Machine member used to connect engine shaft to gear box is cal led-
a. Differential
b. Clutch
c. Flywheel
d. Propeller shaft
Answer: b. Clutch

Which type of clutch does not require clutch pedal?
a. Single plate
b. .Multi plate
c. Centrifugal
d. Cone
Answer: c. Centrifugal
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The valve is opened as the cam lobe on the cam raises the …..
a. Bearing
c. Valve lifter
b. Piston
d. Valve seat
Answer: c. Valve lifter

The size of the engine intake valve is ……………
a. Same as that of exhaust valve
b. Smaller than that of exhaust valve ,
c. Larger than that of exhaust valve
d. Does not depend upon the size of exhaust valve
Answer: b. Smaller than that of exhaust valve

The purpose of valve clearance is to ………..
a. Allow the valve to expand
b. Allow the sliding of valve in the guide
c. Ensure that the valve closes fully
d. Ensure that the crankshaft is free to rotate
Answer: c. Ensure that the valve closes fully
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A relief valve is fitted to the main oil gallery of an engine.
The purpose of this valve is to-
a. Limit the maximum oil pressure
b. Open when the oil is hot
c. Maintain the supply if the gallery becomes blocked
d. Stop the oil flow to the bearings
Answer: a. Limit the maximum oil pressure

Which vehicle is generally provided with four wheel drive?
a. Ambassador car
b. Standard wagon
c. Matador
d. Jeep
Answer: d. Jeep

Leaf springs absorb shocks by ………..
a. Bending
b. Twisting
c. Compression
d. Tension
Answer: a. Bending

The following is (are) the independent suspension system(s) …..
a. Wishbone Arm system
b. Trailing Link system
c. Sliding Pillar system
d. All of these
Answer: d. All of these

The Ackermann steering iayout ……..
a. Makes for safer driving
b. Enables the driver to feel ahead position
c. Reduces load on the kingpins and stub axles
d. None of the above
Answer: a. Makes for safer driving
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In disc brake, the disc is attached to the ………
a. Wheel
b. Axle
c. Suspension system
d. None of these
Answer: b. Axle

The function of master cylinder in hydraulic brakes is to ……….
a. Builds up hydraulic pressure to operate the brakes
b. Maintains constant volume of fluid in the system
c. Serves as a pump to force air out of the hydraulic system
d. All of the above
Answer: d. All of the above

The following factor(s) contribute to the effectiveness of the brakes ………..
a. Area of brake linings
b. Radius of car wheel
c. Amount of pressure applied to shoe brakes
d. All of the above
Answer: d. All of the above
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The process of removing air from the brake system is known as …..
a. Bleeding
b. Self-energizing .
c. Servo action
d. Energization
Answer: a. Bleeding

When brakes are applied on a moving vehicle;
the kinetic energy is converted to ……..
a. Mechanical energy
b. Heat energy
c. Electrical energy
d. Potential energy
Answer: b. Heat energy

The force required to stop a vehicle is dependent on ……
a. The weight of vehicle
b. The deceleration rate
c. Both a and b
d. None of these
Answer: c. Both a and b

Coil springs absorb shocks by……….
a. Bending
b. Twisting
c. Compression
d. Tension
Answer: c. Compression
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The following is a type of leaf springs ……….
a. Three Quarter elliptic
b. Semi elliptic
c. Quarter elliptic
d. All of these
Answer: d. All of these

The material used for making torsion bar is ………
a. Steel
b. Cast iron
c. High carbon steel
d. All of these
Answer: a. Steel

Spring shackles are used to join ……….
a. Chassis frame and spring
c. Chassis frame and axle
b. Spring and Axle
d. All of these
Answer: a. Chassis frame and spring
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Cam actuated double acting hydraulic shock absorber contains ……..
a. No piston
b. Single piston
c. Double pistons
d. Three pistons
Answer: c. Double pistons

The main reasons for crankshaft wear are ………….
a. Different loads at some points of rotation
b. Centrifugal forces due to crankshaft rotation
c. Misalignment in connecting rod
d. All of the mentioned
Answer: d. All of the mentioned


The main causes of crankshaft vibration are ………
a. Variation in torque
b. Cyclic variation of gas and combustion products
c .Unbalanced weight of parts
d. All of the mentioned
Answer: . d. All of the mentioned
In the cam, the distance between the base circle and the nose is called ……..
a. Lift
b. Lobe
c. Flank
d. Pitch
Answer: a. Lift

The function of anti-lock brake system (ABS) is that is ………….
a. Reduces the stopping distance .
b. Minimizes the brake fade
c. Maintains directional control during braking by preventing the wheels from locking
d. Prevents nose dives during braking and thereby postpones locking of the wheels
Answer: c
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In a four wheel drive (4 WD), the numbers of gear boxes are ……………
a. 1
b. 2
c. 3
d. 4
Answer: b. 2
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In the steering gear, a gear sector or toothed roller is meshed with a …….
a. Ball bearing
b. Roller bearing
c. Worm
d. Steering wheel
Answer: c. Worm

The only service that a steering linkage normally requires is ……….
a. Tie-rod adjustment
b. Lubrication
c. Ball-joint replacement
d. None of the mentioned
Answer: a. Tie-rod adjustment

Too much toe-in will be noticed by ……….
a. Excessive tyre wear because of taking
b. Steering wander
c. Feathering of tyres
d. Light steering
Answer: a. Excessive tyre wear because of taking
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The most widely used-brakes are operated ………
a. Electrically
b. Hydraulically
c. By air pressure
d. By vaccum
Answer: b. Hydraulically

Of  the four tyres on a car, the one that wears most is ……
a. Right front tyre
b. Right rear tyre
c. Left front tyre
d. Left rear tyre
Answer: b. Right rear tyre

Weight can be attached to wheel rim to correct ……..
a. Wheel alignment
b. Wheel balance
c. Wheel run out
d. All of these
Answer: b. Wheel balance

Steering gear …….
a. Rack and pinion type
b. Worm and roller type
c. Recirculating ball type
d. Any of  these
Answer: d. Any of  these
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Wheel base of a vehicle is the ……
a. Distance between front and rear axles
c. Extreme length of the vehicle
b. Distance between the front tyres
d. Width of tyres
Answer: a. Distance between front and rear axles