Automobile Engineering – Set 03

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All questions answers in the last paragraph

Q1. 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.

Q2. The drive-shafts are connected to the differential and wheel hubs through universal joints because the universal joints

(A) Absorb the vibrations transferred from the surface of the road
(B) Compensate for variations in the relative positions of the differential and the wheels which result from bumpy road surfaces or other similar driving conditions.
(C) Absorb any difference in speed between the left and right wheels when the vehicle is turning
(D) None of the above

Q3. A four cylinder engine has a capacity of 2.4 litres. The swept volume of one cylinder is

(A) 400 cm³
(B) 600 cm³
(C) 1200 cm³
(D) 2400 cm³

Q4. The air resistance to a car at 20 kmph is R. The air resistance at 40 kmph will be

(A) R
(B) 2R
(C) 4R
(D) 4R²

Q5. The octane rating of petrol commercially available is

(A) 85-95
(B) 95-100
(C) 100-110
(D) 110-125

Q6. The air gap between the central electrode and ground (or side) electrode of a spark plug is around

(A) 0.2 mm
(B) 0.5 mm
(C) 1 mm
(D) 1.5 mm

Q7. The coefficient of friction for the clutch facing is approximately

(A) 0.1
(B) 0.4
(C) 0.8
(D) 1.2

Q8. The vehicle ride will be comfortable if

(A) Unsprung mass is kept minimum
(B) Sprang mass is kept minimum
(C) Vehicle mass is kept minimum
(D) All of these

Q9. A petrol engine of a car develops 125 Nm torque at 2700 r.p.m. The car is driven in second gear having gear ratio of 1.75. The final drive ratio is 4.11. If the overall transmission efficiency is 90%, then the torque available at the driving wheels is

(A) 8.091 Nm
(B) 80.91 Nm
(C) 809.1 Nm
(D) 8091 Nm

Q10. 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

Q11. The auto ignition in a spark ignition engine means

(A) Automatic ignition of the charge at the end of compression
(B) Ignition induced by the passage of a spark
(C) Ignition of the charge before the passage of flame front
(D) Ignition induced to supplement the process of normal combustion

Q12. Highest useful compression ratio (HUCR) is the highest compression ratio at which the

(A) Engine can run
(B) Engine gives maximum output
(C) Engine is most efficient
(D) Fuel can be used in a test engine without knocking

Q13. 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

Q14. When the brake pedal free play is less than the specified value, then the

(A) Brake drags
(B) Brake fades
(C) Vapour locking occurs in the brake lines
(D) Antilock braking system malfunctions

Q15. The acid used in automobile battery is

(A) Hydrochloric acid
(B) Hydrofluoric acid
(C) Nitric acid
(D) Sulphuric acid

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