# 340+ Automobile Engineering Solved MCQs

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1.

A. 0.1 A
B. 25 A
C. 1. A
D. 0.5 A
E. 35 A
2.

## The purpose of the dynamo in an automobile is to

A. Act as a reservoir of electrical energy
B. Continually recharge the battery
C. Convert mechanical energy into electrical energy
D. Partly convert engine power into electric power
E. Supply electric power
Answer» B. Continually recharge the battery
3.

## In a vehicle if there is no king pin offset

A. Starting steering effort will be high
B. Starting steering effort will be zero
C. Wobbling of wheels will increase
D. bracking effort will be high
E. None of the above
Answer» A. Starting steering effort will be high
4.

## In a four stroke engine, for the combustion of one litre of fuel, the volume of air required would be approximately

A. 1 cu-m
B. 5 - 7 cu-m
C. 15 - 16 cu-m
D. 2 cu-m
E. 9 - 10 cu-m
Answer» E. 9 - 10 cu-m
5.

## The number of revolutions per km for a free rolling tyre are less than that calculated from its static radius. This difference in number of revolutions is due to

A. forces in the contact area that cause slight forward of the tread
B. hysteresis of the tyre materials which make the dynamic loaded radius somewhat larger than the static radius
C. either of (A) and (B) above
D. none of the above
E. None of the above
Answer» C. either of (A) and (B) above
6.

## The reaction time of an average driver from recognizing an obstacle is taken as

A. 0.5 to 1.7 seconds
B. 4.5 to 7.0 seconds
C. 3.5 to 4.5 seconds
D. 7 to 10 seconds
E. 2 to 3.5 seconds
Answer» A. 0.5 to 1.7 seconds
7.

## The fuel is injected into the cylinder in Diesel engine when the piston is

A. Pump the fuel to the injector
B. Approaching T.D.C. during compression stroke
C. Just after T.D.C. during exhaust compression stroke
D. Exactly at T.D.C. after compression stroke
E. Approaching T.D.C. during exhaust stroke
Answer» B. Approaching T.D.C. during compression stroke
8.

## Dilution of lubricating oil is caused by

A. Solid contaminants like dust, etc.
B. Solid combustion residues
C. Worn off particles
D. Water
E. Fuels
9.

## The function of oil scraper rings is to

A. Lubricate cylinder walls
B. Retain compression
C. Maintain vacuum
D. Reduce vacuum
E. Reduce piston wear
10.

A. Gear box
B. Dynamo
C. Fan belt
D. Front wheel
E. Flywheel
11.

A. 3 ; 1
B. 6 ; 1
C. 2 ; 1
D. 8 ; 1
E. 10 ; 1
12.

## Exhaust gas leakage into the cooling system is most likely to be due to a defective

C. Water pump
E. Any of the above
13.

## The frame provided for supporting the units of chasis and the body, in case of Tata vehicles is

A. Cross member - type frame
B. Centre beam frame
C. Y-shaped tube frame
D. Self-supporting structure
E. Any of the above
Answer» A. Cross member - type frame
14.

## Which one of the following is not a part of the hydraulic braking system?

A. Wheel cylinder
B. Steering mechanism
D. Master cylinder
E. Brake pedal
15.

## The process of super charging is meant for

A. raising exhaust pressure
B. increasing density of intake air
C. providing air for cooling
D. none of the above
E. An instrument for smoke analysis
Answer» B. increasing density of intake air
16.

## Diesel fuel as compared to petrol is

A. More difficult to ignite
B. Less difficult to ignite
C. Equally difficult to ignite
D. None of the above
E. Compression ratio
Answer» A. More difficult to ignite
17.

## A ring gear is provided around the engine fly-wheel

A. For getting uniform speed
B. To start the engine using self-starter
C. For reducing noise
D. To get variable engine speeds
E. To operate the valves
Answer» B. To start the engine using self-starter
18.

A. Senan
B. Chassis
C. Hull
D. Cabin
E. Aft
19.

## Wax is applied on car body because

A. It is water repellent
B. It seals off the pores
C. The surface shines
D. Any of the above
E. None of the above
Answer» D. Any of the above
20.

A. Coal
C. Mineral oil
D. Crude oil
E. Starch
21.

## Fuel pump for diesel engine is

A. electrically operated
B. mechanically operated
C. pneumatically operated
D. electro-magnetically operated
E. None of the above
22.

## The process of supplying the intake air to the engine cylinder at a pressure greater than the pressure of the surrounding atmosphere is known as

A. supercharging
B. auto-ignition
C. scavenging
D. none of the above
E. None of the above
23.

## Highest useful compression ratio is an indicator of

A. knocking of a fuel at a particular pressure
B. knocking of a fuel at a particular temperature
C. knocking of a fuel in a particular engine
D. knocking of a fuel under specified conditions in a standard engine
E. None of the above
Answer» D. knocking of a fuel under specified conditions in a standard engine
24.

## Which one of the following is antifriction bearing?

A. Ball bearing
B. Roller bearing
C. Taper roller bearing
D. Needle bearing
E. All of the above
25.

## The ignition of the charge in spark ignition engine before spark occurs in spark plug, is known as

A. auto-ignition
B. pre-ignition
C. detonation
D. none of the above
E. None of the above
26.

## Which of the following lamp in a car will have the least wattage

A. Flasher bulb
C. Stop light bulb
D. Ignition warning light
E. Parking light bulb
27.

## The boiling point of Diesel fuel may be expected to be in the range

A. 150 °C to 200 °C
B. 70 °C to 100 °C
C. 125 °C to 135 °C
D. 220 °C to 375 °C
E. 100 °C to 112 °C
Answer» D. 220 °C to 375 °C
28.

## Odometer is

A. An instrument which indicates the condition of the battery
B. An instrument for distance measurement
C. An instrument for BHP measurement
D. An instrument for smoke analysis
E. An instrument used for measurement of fuel consumption
Answer» B. An instrument for distance measurement
29.

## For lubrication of which part of an automobile only grease is used

A. Transmission
B. Steering system
C. Axle drive
D. Tie rod
E. All of the above
30.

## In case of four cylinder in line engine, the number of firing stroke (s) in one revolution of crank is

A. 3
B. 4
C. 2
D. Depends on the design of engine.
E. 1
31.

## Diesel engines are also known as

A. S.I. engines
B. C.I. engines
C. Steam engines
D. none of the above
E. None of the above
32.

## High sulphur content of petrol affects the engine performance by

A. causing corrosion of muffler and exhaust pipe
C. poor explosion characteristics
D. All of the above
E. None of the above
Answer» D. All of the above
33.

## Which part is not common between the petrol and diesel engines

A. Battery
B. Dynamo
C. Air cleaner
D. Fuel injector
E. Exhaust silencer
34.

## The problem of exhaust emissions can be handled by

A. engine design modification
B. treatment of exhaust gases
C. fuel modification
D. All of the above
E. None of the above
Answer» D. All of the above
35.

## The heating value of petrol is

A. 7650 kcal/kg
B. 10,000-10400 kcal/kg
C. 15000-16000 kcal/kg
D. 8000-8500 kcal/kg
E. 12750-13850 kcal/kg
36.

## The king pin inclination is usually

A. Less than
B. Between 2? and 5?
C. More than 7?
D. More than 7?
E. Between 1? to 2?
Answer» B. Between 2? and 5?
37.

## Which of the following can be used for starting a 1000 H.P. diesel engine?

A. Battery
B. Shunt motor
C. Small petrol engine
D. Compressed air
E. Any of the above
38.

## In a scooter engine the cylinder is lubricated by

A. Cylinder does not require lubrication
B. Lubrication plug
C. Pressure lubrication
D. Splash lubrication
E. Mixing lubricating oil in the fuel
Answer» E. Mixing lubricating oil in the fuel
39.

## Which one of the following is independent of fuel constituents, combustion chamber design, temperature and pressure of compressed charge

A. Pinking
B. Pre-ignition
C. Knocking
D. none of the above
E. None of the above
40.

## Engine pistons are generally made of aluminium alloy because

A. It has less wear
B. It is stronger
C. It absorbs shocks
D. It does not react with fuel as well as lubricating oil
E. It is lighter
41.

A. Carbon steel
B. Stainless steel
C. High speed steel
D. Mild steel
E. Spring steel
42.

A. Injection
B. Vaporization
C. Atomisation
D. Ionisation
E. Carburetion
43.

A. n-heptane
B. Toluene
C. Isoctave
D. Benzene
E. Alcohol
44.

## A square type engine

A. Has operating speed as 64, 81, 100, 121, 144, 169, 196 rpm or the like
B. Has cylinder bore equal to stroke length
C. Has four cylinders with phase shift of 90? between any two consecutive cylinders
D. Has two cylinders horizontal and two cylinders vertical
E. Has geometrical shape as square
Answer» B. Has cylinder bore equal to stroke length
45.

## For balancing single cylinder engine a counter weight is added to

A. Crankshaft
B. Piston rings
C. Piston
D. Gudgeon pin
E. Connecting rod
46.

## In an engine shows lack of power on running the probable cause could be

A. Poor compression
B. Faulty ignition
C. Overheating
D. Over cooling
E. Any of the above
Answer» E. Any of the above
47.

## If the end mixture of S.I. engine is having low temperature and long igition delay, then knocking will

A. accelerate
B. decrease
C. remain constant
D. none of the above
E. None of the above
48.

## The maximum pressure generated by the fuel injection pump does not reach the nozzle end immediately. The lag is due to

A. friction in the oil column
B. pressure wave in the oil column
C. turbulence in the cylinder
D. none of the above
E. None of the above
Answer» B. pressure wave in the oil column
49.

## Which company is not engaged in the manufacture of tyres in India

A. Larsen & Toubro
B. Appollo
C. Modi
D. Good year
E. J.K.
50.

## If the cut-off is decreased, the efficiency of Diesel cycle

A. is equal to Otto cycle
B. is more than Otto cycle
C. is less than Otto cycle
D. approaches to Otto cycle
E. None of the above
Answer» D. approaches to Otto cycle
51.

## The size of the engine intake valve is

A. Same as that of exhaust valve
B. Depends upon the temperature of ambient air.
C. Does not depends upon the size of the exhaust valve
D. Smaller than that of exhaust valve
E. Large than that of exhaust valve
Answer» D. Smaller than that of exhaust valve
52.

## To avoid chances of maisalignment the bearing generally used is

A. Double row ball bearing
B. Axial bearing
C. Self-aligning bearing
D. Taper roller bearing
53.

A. Displacement
B. Lift
C. Flank
D. Lobe
E. Nose
54.

A. Injector
B. Filter
C. Spray nozzles
D. Supply pump
E. Air cleaner
55.

A. 1-2-4-3
B. 1-2-3-4
C. 1-4-3-2
D. 1-2-4-2
E. 1-3-2-4
56.

## Magneto ignition system is used in

A. S.I. engines
B. C.I. engines
C. Steam engines
D. none of the above
E. None of the above
57.

## Cross wire grooves on tyres

A. Absorb shocks due to road unevenness
B. Lessen the danger of skidding
C. Provide good traction
D. Provide better load carrying capacity
E. Secure better steering properties
58.

## Automobiles in India generally do not use battery with a voltage of

A. 6 volts
B. 12 volts
C. 18 volts
D. 24 volts
E. Any of the above
59.

## Loss of engine compression can result from

A. Defective fan delt
B. Loose valve and tapper clearance
C. Poor lubrication
D. Worn rings or cylinder wall
E. Any of the above
Answer» D. Worn rings or cylinder wall
60.

## Which vechicle is generally provided with four wheel drive

A. Standard wagon
C. Jeep
61.

## Which air cleaner is considered to be most effective in Diesel engines?

A. All are equally effective
B. Whirl type
C. Oil bath type
D. Wet type
E. Dry type
62.

## The starter motor is driven by

A. V-belt drive
B. P.I.V drive
C. Chain drive
D. Flat belt drive
E. Gear drive
63.

## Which region of an automobile tyre is subjected to greatest flexing action?

B. Side wall
C. Shoulder
E. None of the above
64.

## The time before actual fuel injection and pump olunger starts to pump fuel, is known as

A. injection lag
B. overlap
C. ignition lag
D. none of the above
E. None of the above
65.

## The inlet value of a four stroke I.C. engine, in actual practice, should close

A. exactly at the end of suction stroke
B. slightly after the end of suction stroke
C. slightly before the end of suction stroke
D. none of the above
E. None of the above
Answer» B. slightly after the end of suction stroke
66.

## Ignition system used in scooters is

A. magneto system
B. battery system
C. Combination of magneto and battery system
D. neither magneto nor battery system
E. None of the above
67.

## In a petrol engine, the gas which does not burn and passes out without transformation is

A. Oxygen
B. Carbondioxide
C. Nitrogen
D. Carbon monoxide
E. Water vapour
68.

## In case of clutch if the springs become weak, the remedy lies in

A. Tightening further the springs
B. Interchanging the springs
C. Retempering the springs
D. Replacing the springs
E. Any of the above
69.

## If the water level in engine is maintained low, the likely consequence could be

A. Piston seizure
B. Engine knocking
C. Bearing deterioration
D. All of the above
E. None of the above
Answer» D. All of the above
70.

## At the first sight a petrol engine is identified by

A. Size of air cleaner
B. Cylinder size
C. Spark plug
D. Power output
E. Operating speed
71.

## Aluminium cylinder blocks require

A. No lines
B. Brass liners
C. Stainless steel liners
D. Cast iron liners
E. Aluminium liners
72.

A. Scooters
B. Jeeps
C. Motorcycles
D. Trucks
73.

## Engine starter motor is

A. D.C. compound motor
B. D.C. series motor
C. Synchronous motor
D. Single phase A.C. motor
E. D.C. shunt motor
74.

## Which one of the followings is used in C.I. engines?

A. spark plug
B. injector
D. none of the above
E. None of the above
75.

## Failure of an engine to start even though it turns over at normal cranking speed could be due to

A. A defective cranking motor
B. Defective ignition
C. Run down battery
D. Sticking valve
E. Low ambient temperature
76.

## The substance which when added in a small proportion into petrol reduces knocking is

A. iso-butane
B. n-heptane
C. methyl nepthalene
E. None of the above
77.

A. Plastic
B. Aluminium
C. P.V.C.
D. Steel
E. Copper
78.

## The percentage of heat released from fuel air mixutre, in an internal combustion engine which is converted into useful work is roughly

A. 60 - 64 percent
B. 20 - 25 percent
C. 35 - 45 percent
D. 10 percent
E. 15 - 20 percent
Answer» B. 20 - 25 percent
79.

## The knocking C.I engines is characterised by the sudden auto-ignition of the mixture

A. at the end of the combustion process
B. in the middle of combustion process
C. at the very beginning of the combustion process
D. none of the above
E. None of the above
Answer» C. at the very beginning of the combustion process
80.

## The braking system provided on trains is

A. Pneumatic
B. Vaccum
C. Hydraulic
D. Mechanical
E. Air assisted hydraulic
81.

## The need for installing new piston rings is determined by checking

A. The gap between the ends of the ring
B. The clearance between cylinder and piston rings
C. The clearance between piston and piston rings
D. The clearance between cylinder and piston
E. The surface of the piston ring
Answer» B. The clearance between cylinder and piston rings
82.

## In a Diesel engine, during combustion the pressure may increase at a range of

A. 55-75 atm
B. 10-15 atm
C. 20-30 atm
D. 15-20 atm
E. Depends on engine size and speed
83.

## A smoky blue exhaust is due to

A. Burning of oil in combustion chamber
C. Excessive air
E. Excessive rich mixture
Answer» A. Burning of oil in combustion chamber
84.

## Differential gear box oil is usually renewed after

A. 1000 km
B. 2500 - 6000 km
C. 10000 - 20000 km
D. 2500 km
E. 6000 km
Answer» B. 2500 - 6000 km
85.

## The tendency of a petrol engine to knock increases by

A. Turbo-charging
B. Cataytic converter
C. Alcohol
E. Super-charging
86.

## In S.I. engine if the spark plug deposit indicates black coating of soot, it therefore indicates that the engine has been generally operating on

A. Too rich mixture
B. Most economical mixture
C. Too lean mixture
D. Slightly rich mixture
E. Stoichiometric mixture
87.

## Ignition quality of petrol is expressed by

A. Calorific value
B. Octane no
C. Cetane no
D. Mass/volume ratio
E. Alcohol
88.

## Petrol engines are also known as

A. S.I. Engines
B. C.I. Engines
C. Steam Engines
D. none of the above
E. None of the above
89.

## The air gap between the central electrode and ground electrode of a spark plug is approximately

A. 1 cm
B. 0.5 cm
C. 0.2 cm
D. 0.1 cm to 0.06 cm
E. None of the above
Answer» D. 0.1 cm to 0.06 cm
90.

## In commercial vehicle layouts engine is located forward, rear or under floor mainly to

A. Minimize the tendency to over turn
B. Reduce the weight of chassis
C. Increase fuel economy
D. Better utilise the space
E. Have better weight distribution
Answer» E. Have better weight distribution
91.

A. Glazed
B. Ground
C. Honed
D. Reamed
E. Bored
92.

## Wheel base of a vehicle is the

A. Distance between the front tyres
B. Distance between front and rear axles
C. Extreme length of the vehicle
D. The combined width of rear tyres
E. Width of tyres
Answer» B. Distance between front and rear axles
93.

## In a vehicle the probable cause for hard steering could be

A. Low tyre pressure
B. Bent wheel spindle
C. Tie rod ends tight
D. Excessive castor
E. Any of the above
Answer» E. Any of the above
94.

## An opposed cylinder engine has

A. One crankshaft and two camshafts
B. One crankshaft and one camshafts
C. Two crankshafts and two camshafts
D. Two crankshafts and four camshafts
E. Two crankshafts and one camshaft
Answer» C. Two crankshafts and two camshafts
95.

A. 4.5
B. 3.5
C. 2.5
D. 1.5
E. 5
96.

A. Rajdoot
B. Yezdi
C. Jawa
D. Yamaha
E. Bullet
97.

## Two speed reverse gear arrangement is generally provided in case of

A. Standard wagon
B. Jeep
E. Tractors
98.

## Worn out carburettor jets are likely to cause

A. More noise
B. Excess fuel consumption
C. Knocking
D. Engine warm up
E. Excess engine output
99.

## The firing order in the case of a four-cylinder I.C. engine (inline) is given as

A. 1-2-3-4
B. 1-4-3-2
C. 1-2-4-3
D. none of the above
E. None of the above
Explanation: The firing order for a four-cylinder internal combustion engine is typically 1-2-4-3, where the cylinders are numbered from the front of the engine to the back. This firing order is commonly used in many four-cylinder engines because it provides smooth and even power delivery, as each cylinder fires in a balanced sequence.
100.

A. 50 c.c.
B. 250 c.c.
C. 10 c.c.
D. 150 c.c.
E. 174 c.c.