# Automobile Engineering MCQ Practice Test – Set 05

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## Q1. The cetane number of a Diesel fuel is a measure of

(A) Volatility
(B) Viscosity
(C) Ignition quality
(D) Delay period

Answer: (D) Delay period

## Q2. 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: (B) Society of automotive engineers (SAE)

## Q3. Thinner is added to the paint in order to

(A) Make pigments and resin mix easily
(B) Make paint film hard
(C) Optimise its viscosity
(D) None of these

Answer: (C) Optimise its viscosity

(A) 25
(B) 45
(C) 70
(D) 90

Answer: (B) 45

## Q5. The basic purpose of tyres is to

(A) Grip the road and provide good traction
(B) Substitute for springs
(C) Act as brake
(D) None of these

Answer: (A) Grip the road and provide good traction

## Q6. If the spark plug deposit indicates black coating of soot, it indicates that the engine has been generally operating on

(A) Too lean mixture
(B) Stoichiometric mixture
(C) Most economical mixture
(D) Too rich mixture

Answer: (D) Too rich mixture

(A) 30°
(B) 60°
(C) 90°
(D) 120°

Answer: (A) 30°

## Q8. The caster is called positive when the top of the king pin is inclined to the

(A) Rear of the vehicle
(B) Front of the vehicle
(C) Left of the vehicle
(D) Right of the vehicle

Answer: (A) Rear of the vehicle

## Q9. The gradient resistance to a vehicle having a mass of 980 kg moving on an incline of 10° is

(A) 1.6694 N
(B) 16.694 N
(C) 166.94 N
(D) 1669.4 N

Answer: (D) 1669.4 N

## Q10. Damper is also known as

(A) Shock absorber
(B) Torsion bar
(C) Spring
(D) Radius rod

Answer: (A) Shock absorber

## Q11. 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: (A) Air and fuel

## Q12. 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: (B) Spongy lead (Pb)

(A) 0.74
(B) 1.00
(C) 1.12
(D) 1.19

Answer: (D) 1.19

## Q14. A traction control system (TCS) in automobiles controls the

(A) Vibrations on the steering wheel
(B) Engine power during acceleration
(C) Torque that is transmitted by the tyres to the road surface
(D) Stopping distance in case of emergency

Answer: (C) Torque that is transmitted by the tyres to the road surface

## Q15. In Diesel engines, during suction stroke, _ is drawn in the cylinder.

(A) Air and fuel
(B) Only fuel
(C) Only air
(D) None of these

Answer: (C) Only air

## Q16. The crescent shaped cavity on the piston head top surface is called as

(A) Piston oil hole
(B) Snap ring
(C) Valve recess
(D) Valve clearance

Answer: (C) Valve recess

## Q17. Which of the following indicates multi-grade oil?

(A) SAE 30
(B) API SF
(C) SAE20 W50
(D) API 50

Answer:(C) SAE20 W50

## Q18. In Spark Ignition Engine

(A) Only air is introduced into the cylinder
(B) The mixture of air and fuel is introduced into the cylinder from carburettor
(C) Both (A) and (B)
(D) None of these

Answer: (B) The mixture of air and fuel is introduced into the cylinder from carburettor

## Q19. The reconditioning process used to give cylinder bore surfaces a crosshatch pattern, is known as

(A) Honing
(B) Porous plating
(C) Boring
(D) Shot peening

Answer: (A) Honing

## Q20. The main characteristics of a maintenance free (MF) battery is that

(A) A maintenance free battery requires little maintenance during normal use and it is sufficient to add water instead of an electrolyte containing sulphuric acid
(B) A maintenance free battery has a relatively short shelf life when compared with standard batteries
(C) Since it is sealed, the water in maintenance free battery is not lost through evaporation thus accordingly it is not necessary to top up the cells with water
(D) Recharging of a maintenance free battery is neither required nor possible

Answer: (C) Since it is sealed, the water in maintenance free battery is not lost through evaporation thus accordingly it is not necessary to top up the cells with water

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