Multiple Choice Questions and Answers (MCQs) on Automobile Engineering
01. The painting of automobiles is done to
(A) Prevent rust from growing on the body
(B) Improve its external appearance
(C) Retain the characteristics of steel for long
(D) All of these
Answer: Option D
02. The calorific value of petrol is about
(A) 36.5-38.5 MJ/kg
(B) 39.4-42.5 MJ/kg
(C) 42.7-43.5 MJ/kg
(D) 45.5-47 MJ/kg
Answer: Option C
03. The coefficient of friction for the clutch facing is approximately
(A) 0.1
(B) 0.4
(C) 0.8
(D) 1.2
Answer: Option B
04. The air resistance to a car at 20 kmph is R. The air resistance at 40 kmph will be
(A) R
(B) 2 R
(C) 4R
(D) 4 R²
Answer: Option C
05. The stroke of an engine is the
(A) Volume of the cylinder
(B) Length of the connecting rod
(C) Internal diameter of the cylinder
(D) Distance between T.D.C. and B.D.C.
Answer: Option D
06. The braking control type traction control system (TCS) generally operates in the speed range of
(A) Less than 20 kmph
(B) Less than 40 kmph
(C) Less than 60 kmph
(D) More than 60 kmph
Answer: Option B
07. The function of a first compression ring (top ring) is that it
(A) Increases the combustion temperature
(B) Creates swirl
(C) Maintains a seal and prevents the fuel leakage
(D) Maintains a seal and prevents escape of burned gases and loss of pressure in the combustion chamber
Answer: Option D
08. The component that connects the steering rack to the knuckles is
(A) Tie rod
(B) Sector gear
(C) Pivot
(D) Spline
Answer: Option A
09. The cetane number of a Diesel fuel is a measure of
(A) Volatility
(B) Viscosity
(C) Ignition quality
(D) Delay period
Answer: Option D
10. In petrol engines, during suction stroke, ________ is drawn in the cylinder
(A) Air and fuel
(B) Only fuel
(C) Only air
(D) None of these
Answer: Option A
11. The main feature of Macpherson strut suspension is that
(A) The vertical size of the suspension can be made more compact
(B) Non vertical external forces are supported by the suspension arms
(C) The unsprung mass in lighter
(D) The assembly is slightly more complicated in design
Answer: Option B
12. The capacity of a battery is usually expressed in terms of
(A) Volts
(B) Amperes
(C) Weight
(D) Ampere hours
Answer: Option D
13. The most commonly used power plant in automobiles is
(A) Gas turbine
(B) I.C. engine
(C) Battery
(D) None of these
Answer: Option B
14. In a square type engine
(A) Geometrical shape is square
(B) Diameter and length of piston are same
(C) Two cylinders are placed horizontal and two vertical
(D) Stroke length and cylinder bore are same
Answer: Option D
15. The path taken by intake air is
(A) Carburettor (or throttle body) air cleaner intake manifold intake ports cylinders (B) Air cleaner carburettor (or throttle body) intake ports intake manifold cylinders (C) Air cleaner intake manifold carburettor (or throttle body) intake ports cylinders (D) Air cleaner carburettor (or throttle body) intake manifold intake ports cylinders
Answer: Option D
16. The brake warning light warns the driver of
(A) Water in the master cylinder
(B) Air in the hydraulic system
(C) Failure of the primary or secondary circuit of hydraulic system
(D) Power brake failure
Answer: Option C
17. The connecting rods are generally made of ________ shaped cross-section.
(A) I
(B) C
(C) L
(D) H
Answer: Option A
18. It is necessary to maintain the valve clearances as they
(A) Reduce the resistance to sliding that occurs between the cam and the tappet
(B) Allow for lengthening of the valves owing to the heat of combustion
(C) Increase the speed at which the valves move up and down
(D) Make the crankshaft turn smoothly
Answer: Option B
19. The characteristic that is enhanced by the honing of cylinder sleeves inner surface is
(A) Cooling efficiency
(B) Resistance to wear
(C) Lubrication performance
(D) None of these
Answer: Option C
20. If the air-fuel mixture ignites before the spark takes place at spark plug, the condition is called
(A) Detonation
(B) Ignition
(C) Pre-ignition
(D) Rumble
Answer: Option C
21. The instrument used to check specific gravity of acid in a battery is
(A) Hydrometer
(B) Hygrometer
(C) Anemometer
(D) Multimeter
Answer: Option A
22. The crankshaft of a typical inline four cylinder engine has ________ balance weights.
(A) 12
(B) 4
(C) 16
(D) 8
Answer: Option D
23. The condition that results in large quantities of HC emission is
(A) High temperature combustion
(B) Incomplete combustion
(C) Low temperature combustion
(D) High atmospheric temperature combustion
Answer: Option B
24. The engine oil viscosity is defined by _________ ratings.
(A) Automatic transmission fluid (ATF)
(B) Society of automotive engineers (SAE)
(C) Gross vehicle weight (GVW)
(D) American petroleum institute (API)
Answer: Option B
25. The negative plates of a lead acid battery has
(A) Lead peroxide (PbO₂)
(B) Spongy lead (Pb)
(C) Lead sulphate (PbSO₄)
(D) Sulphuric acid (H₂SO₄)
Answer: Option B