AUTOMOBILE MCQ

1. In a four stroke engine each cylinder has

a) One valve
b) Two valves
c) Three valves
d) Four valves
Answer: b
2. In a diesel engine the fuel injection pressure is in the range
100 to 170 atm
b) 60 to 70 atm
30 to 40 atm
20 to 25 atm
Answer: a
3. The valve is opened as the cam lobe on the cam raises the
a) Bearing
b) Piston
c) Valve lifter
d) Valve seat
Answer: c
4. Exhaust valve temperature is about
35 degrees Celsius
100 degrees Celsius
c) 150 degrees Celsius
500 degrees Celsius
Answer: d
5. The size of the engine intake valve is
a) Same as that of exhaust valve
b) Smaller than that of exhaust valve
Larger than that of exhaust valve
d) Does not depend upon the size of exhaust valve
Answer: b
6. The device used to measure the clearance between the valve and tappet of an IC
Engine is
a) Feeler gauge
b) Snap gauge
c) Slip gauge
d) Micrometer

a
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
8. The opening and closing of a valve is respectively done by
a) A cam and a spring
b) A spring and a cam
c) Gas pressure and cam
d) Cylinder vacuum and spring
Answer: a
9. On modern four stroke engines the exhaust valve opens just
a) Before TDC
b) After TDC
c) Before BDC
d) After BDC
Answer: c
10. On modern four-stroke engines, the inlet valve opens just
a) Before TDC
b) After TDC
c) Before BDC
d) After BDC
a
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
12. The transmission system transmits power from engine to wheels.
a) Speed
b) Power
c) Current
d) Pressure
Answer: b
13. Which of the following is not a part of the transmission system
a) Clutch
b) Axles
c) Wheels
d) Gear box
Answer: c
14. The loads supported by an automobile frame are
a) Weight of the body, passengers and cargo loads
b) Torque from engine and transmission
c) Sudden impacts from collisions
d) All of the mentioned
Answer: d
15. An automobile chassis does not include which one of the following parts
a) Shock absorbers
b) Steering system
c) Differential
d) Brakes
Answer: c
16. The electrical system of an automobile contains which of the following
a) Battery
b) Alternators
c) Lighting systems
d) All of the mentioned
Answer: d
17. Which of these were or are used in automobiles to provide suspension.
a) Leaf springs
b) Coil springs
c) Torsion bars
d) All of the mentioned
Answer: d
18. What are ‘Air Dams’
a) Spoilers at the front of a vehicle
b) Spoilers at the rear of a vehicle
c) Spoilers at the sides of a vehicle
d) Spoilers at the top of a vehicle

Answer: a
19. What are ‘Wings’ of a vehicle
a) Spoilers at the front of a vehicle
b) Spoilers at the rear of a vehicle
c) Spoilers at the sides of a vehicle
d) Spoilers at the top of a vehicle
Answer: b
20. The lid that covers the engine top in a car and situated at the front is called
________
Gill
b) Softtop
c) Hood
d) Spoiler
Answer: c
An upraised part on the hood which directs the air flow into the engine
compartment is called
a) Spoiler
b) Hotpipe
c) Hood scoop
d) Wings

22. Why 'Bumpers' are used in cars

a) To reduce the impact in case of low speed collisions
b) To improve the aerodynamics of a car
c) To increase the engine performance
d) None of the mentioned
Answer: a
23. The central portion of the wheel is called
a) Rim
b) Scale
c) Hub
d) Axle
Answer: c
24. A _____ is a horizontal surface at the back of a car and serves as a lid to the
trunk.
a) Trunktop
b) Deck
c) Hood
d) Backlight
Answer: b
25. A 'bucket seat' can accommodate how many persons?
a) One
b) Two
c) Four
d) None of the mentioned
Answer: a
26. 'Head restraints' are an
a) Automotive style feature
b) Automotive safety feature
c) Automotive performance feature
d) None of the mentioned
Answer: b
27. In which of the following is a fuel injector used?
a) Compression-ignition engines
b) Spark-ignition engines
c) Steam engines
d) Sterling engines
Answer: a
28. At which stroke is the fuel injected in the CI engine?
a) Suction stroke
b) Compression stroke
c) Expansion stroke
d) Exhaust stroke
Answer: b
29. Which of the following is the port fuel-injection system?
a) D–MPFI
b) L–MPFI
c) GDI
d) TBI
Answer: b
30. What is the range of pressure achieved in the injection pump?
a) 120–200 bar
10–20 bar
c) 400–500 bar
< 10bar
Answer: a
31. In a pneumatic governor, which of the following controls the amount of vacuum?
applied to the diaphragm?
a) Spring
b) Accelerator pedal
c) Butterfly valve
d) Lever
Answer: a
32. A six-cylinder, four-stroke diesel engine develops a power of 200 kW at 2000
revolution per minute. The brake specific fuel consumption is 0.3 kg / kW–h. What
Is it time for injection if the injection occurs over a 20° crank angle?
a) 1 millisecond
b) 2 milliseconds
c) 1.5 milliseconds
d) 1.66 milliseconds
Answer: d
33. What is the spray cone angle in the Pintle nozzle?
a) 60°
15°
c) 25°
45°
Answer: a
34. Which of the following is not a part of the injector assembly?
a) Needle valve
b) Nozzle
c) Diaphragm
d) Compressor spring
Answer: c
35. Which of the following is not the function of the fuel injection system?
a) Time the fuel injection
b) Filter the fuel
c) Atomize the fuel to fine particles
d) Control the engine speed
Answer: d
The cold start injector provides a lean air-fuel ratio.
a) True
b) False
Answer: b
37. Which type of lubrication system is used in a two-stroke engine?
a) Mist lubrication system
b) Wet sump lubrication system
c) Dry sump lubrication system
d) Splash lubrication system
Answer: a
38. In most automobiles, which lubrication system is commonly used?
a) Splash system
b) Pressure system
c) Petrol system
d) Gravity system
Answer: b
39. The pressure inside the lubrication system is controlled by ______
a) Oil pump
b) Oil filter
c) Relief valve
d) Supply voltage
Answer: c
40. What is the need for crankcase ventilation?
a) To cool cylinder
b) To cool crankcase
c) To cool piston
d) To remove blow-by
Answer: d
41. Why are detergents used as oil additives?
a) To increase fire point
b) To prevent foaming
c) To prevent sludge formation
d) To reduce viscosity
Answer: c
42. Which of the following is the most important property of the lubricant?
a) Density
b) Thermal conductivity
c) Viscosity
d) Melting point
Answer: c
43. Which of the following viscosity indices shows the larger changes in viscosity
with temperature?
50
b) 100
c) 45
d) 10
Answer: d
44. Which of the following oils is multi-grade oil?
a) SAE 10W 30
b) SAE 25W
c) SAE 10
SAE 20W
Answer: a
45. Which of the following oils has the highest viscosity?
a) SAE 20
SAE 10
c) SAE 50
d) SAE 45
Answer: c
The vegetable oils are used as lubricants in the automobiles.
a) True
b) False
Answer: b
47. In a disc brake, which component provides the pad-to-disc adjustment?
a) Bleed screw
b) Piston
c) Caliper
d) Piston seal
Answer: d
48. What is the braking torque at the leading shoe if the resultant frictional force acts at a
distance of 250 mm from the brake drum center, coefficient of friction between the
shoe and the drum as 0.5, the free ends of the two shoes are pushed apart with a
force of 300 N which is acting at a distance of 320 mm from anchor, and two shoes
are anchored together 170 mm away from the brake drum center?
276.6 Nm
256.6 Nm
c) 266.6 Nm
d) 246.6 Nm
Answer: c
49. What principle does the braking system in the car work on?
a) Frictional force
b) Gravitational force
c) Magnetic force
d) Electric force
Answer: a
50. Generally, which brakes are on the front wheels?
a) Drum brake
b) Disk brake
Shoe brake
Double shoe brake
Answer: b
51. If the car is moving on the level road at a speed of 50 km/h and has a wheelbase of 3.
m, a distance of C.G. from the ground 700 mm and the distance from the rear wheels is 1.1 m.
Coefficient of friction is 0.7. What is the retardation if the brakes are applied to the
rear wheels?
3.7 m/s 2
b) 2.7 m/s 2
c) 1.7 m/s 2
d) 4.7 m/s 2
Answer: a
52. If the car is moving on the level road at a speed of 50 km/h and has a wheelbase of 4
m, a distance of C.G. from ground 800 mm and distance from rear wheels is 1.2 m.
Coefficient of friction is 0.8. What is the retardation if the brakes are applied to the
front wheels?
3.4 m/s 2
b) 2.4 m/s 2
c) 1.4 m/s 2
d) 4.4 m/s 2
Answer: b
53. If the car is moving on the level road at a speed of 50 km/h and has a wheelbase of 4.
m, a distance of C.G. from ground 800 mm and distance from rear wheels is 1.2 m.
The coefficient of friction is 0.8. What is the retardation if the brakes are applied to all?
wheels?
7.8 m/s 2
b) 6.8 m/s 2
5.8 m/s 2
d) 4.8 m/s 2
Answer: a
54. The car is moving up on the 12-degree inclined road with a horizontal speed of 36 km/h.
having a wheelbase of 1.4 m. The center of gravity (C.G.) of the car is 0.9 m above the road.
The coefficient of friction is 0.7. What is the retardation of the car if the brakes are applied?
applied to all the four wheels?
8.75 m/s 2
b) 8.81 m/s2
c) 7.71 m/s2
6.81 m/s 2
a
55. The car is moving down on the 14° inclined road with horizontal at 36 km/h
which has a wheelbase of 1.4 m. The center of gravity of the car is 0.9 m above the road.
The coefficient of friction is 0.75. What is the retardation of the car if the brakes are applied?
applied to all the four wheels?
4.76 m/s 2
b) 5.76 m/s2
c) 6.76 m/s2
7.76 m/s 2
Answer: a
56. The metering valve is used to proportion the braking effect between the front and rear.
the rear axle.
a) True
b) False
Answer: b
57. The function of the crankcase in two-stroke petrol engines is
It holds the engine lubricating oil
It forms a pressurised chamber for fuel air mixture
c) It holds the exhaust gases after combustion
d) None of the mentioned
Answer: b
58. Connecting rods are generally of the following form
a) Forged I-section
b) Forged round section
c) Cast iron square section
d) Forged square section steel
Answer: a
59. The purpose of crankcase ventilation is to
a) Cool the oil
b) Remove vaporised water and fuel
c) Supply oxygen to the crankcase
It assists in maintaining the viscosity of oil
Answer: b
60. The escape of burned gases from the combustion chamber past the pistons and
into the crankcase is called
a) Gas loss
b) Blow by
c) Bypass
d) Passed gas
Answer: b
61. The connecting rod is attached to the piston by the
a) Rod cap
b) Piston pin
c) Cap bolt
d) Lower cap
Answer: b
62. Engine pistons are generally made of aluminum alloy because
It is lighter
b) It is stronger
c) It has less wear
It absorbs shock
Answer: a
63. Piston compression rings are made of
a) Cast iron
b) Steel
c) Aluminum
d) Bronze
Answer: a
64. Gudgeon pins are made of
a) Cast iron
b) Aluminum
c) Same material as that of piston
d) Hardened and ground steel
Answer: c
65. The purpose of a piston pin is that
a) It prevents the valve from rotating
It links the connecting rod to the crankshaft
c) It ensures the piston ring to the piston
It connects the piston to the connecting rod.
Answer: d
66. When the number 1 piston of a four-cylinder inline four-stroke engine is performing the
power stroke, no.4 piston is on the stroke called
a) Suction
b) Compression
c) Power
d) Exhaust
Answer: a