Automobile Engineering MCQs

Question 1

If clearance volume of I.C. engines is increased, the compression ratio will

Accepted Answer

Decrease

Answer

Increase

Answer

Remain constant

Answer

Be doubled

Question 2

The calorific value of Diesel is about

Accepted Answer

45.5 MJ/kg

Answer

36.5 MJ/kg

Answer

38.5 MJ/kg

Answer

42.5 MJ/kg

Question 3

The specific gravity of Diesel is about

Accepted Answer

0.85

Answer

0.65

Answer

0.75

Answer

0.95

Question 4

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

Accepted Answer

600 cm3

Answer

400 cm3

Answer

1,200 cm3

Answer

2,400 cm3

Question 5

The calorific value of petrol is about

Accepted Answer

42.7-43.5 MJ/kg

Answer

36.5-38.5 MJ/kg

Answer

39.4-42.5 MJ/kg

Answer

45.5-47 MJ/kg

Question 6

The specific gravity of petrol is about

Accepted Answer

0.75

Answer

0.85

Answer

0.95

Answer

1.25

Question 7

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

Accepted Answer

Valve recess

Answer

Piston oil hole

Answer

Snap ring

Answer

Valve clearance

Question 8

The formula for Iso-octane is

Accepted Answer

C8H18

Answer

C7H17

Answer

C6H18

Answer

C7H18

Question 9

The mechanical efficiency $$\left( {{\eta _{	ext{m}}}} ight)$$ of an I.C. engine is equal to (where I.P. = Indicated power, B.P. = Brake power and F.P. = Frictional power)

Accepted Answer

$$\frac{{{	ext{B}}{	ext{.P}}{	ext{.}}}}{{{	ext{I}}{	ext{.P}}{	ext{.}}}}$$

Answer

$$\frac{{{	ext{I}}{	ext{.P}}{	ext{.}}}}{{{	ext{B}}{	ext{.P}}{	ext{.}}}}$$

Answer

$$\frac{{{	ext{B}}{	ext{.P}}{	ext{.}}}}{{{	ext{F}}{	ext{.P}}{	ext{.}}}}$$

Answer

$$\frac{{{	ext{F}}{	ext{.P}}{	ext{.}}}}{{{	ext{B}}{	ext{.P}}{	ext{.}}}}$$