Automobile Engineering MCQ Questions & Answers

11

The specific gravity of Diesel is about

A) 0.65 B) 0.75 C) 0.85 D) 0.95

Discuss

Answer & Solution

Answer: Option C

Solution:

The specific gravity of Diesel is about 0.85

12

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) 1,200 cm³ D) 2,400 cm³

Discuss

Answer & Solution

Answer: Option B

Solution:

Volume of one cylinder will be $$\frac{{2.4}}{4}$$ = 0.6 litres or 600 cubic centimeters.

13

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

Discuss

Answer & Solution

Answer: Option C

Solution:

The calorific value of petrol is about 42.7-43.5 MJ/kg

14

The specific gravity of petrol is about

A) 0.75 B) 0.85 C) 0.95 D) 1.25

Discuss

Answer & Solution

Answer: Option A

Solution:

The specific gravity of petrol is about 0.75

15

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

Discuss

Answer & Solution

Answer: Option C

Solution:

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

16

The formula for Iso-octane is

A) C₈H₁₈ B) C₇H₁₇ C) C₆H₁₈ D) C₇H₁₈

Discuss

Answer & Solution

Answer: Option A

Solution:

The formula for Iso-octane is C₈H₁₈

17

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

A) $$\frac{{{\text{I}}{\text{.P}}{\text{.}}}}{{{\text{B}}{\text{.P}}{\text{.}}}}$$ B) $$\frac{{{\text{B}}{\text{.P}}{\text{.}}}}{{{\text{I}}{\text{.P}}{\text{.}}}}$$ C) $$\frac{{{\text{B}}{\text{.P}}{\text{.}}}}{{{\text{F}}{\text{.P}}{\text{.}}}}$$ D) $$\frac{{{\text{F}}{\text{.P}}{\text{.}}}}{{{\text{B}}{\text{.P}}{\text{.}}}}$$

Discuss

Answer & Solution

Answer: Option B

Solution:

The mechanical efficiency $$\left( {{\eta _{\text{m}}}} \right)$$ of an I.C. engine is equal to $$\frac{{{\text{B}}{\text{.P}}{\text{.}}}}{{{\text{I}}{\text{.P}}{\text{.}}}}$$
Where
I.P. = Indicated power
B.P. = Brake power
F.P. = Frictional power

18

The function of a second ring is that it is a

A) Back up compression ring which will work in place of the top ring when it is broken B) Compression ring and aids the top ring in sealing and cooling C) Back up oil control ring which will work in place of the bottom ring when it is broken D) Cushion ring which prevents piston slap and knock

Discuss

Answer & Solution

Answer: Option B

Solution:

The function of a second ring is that it is a Compression ring and aids the top ring in sealing and cooling

19

The starting system includes

A) A battery, a starter, and an ignition switch B) A battery, a distributor, and an ignition switch C) A battery, a starter, and a distributor D) A distributor, a starter, and an ignition switch

Discuss

Answer & Solution

Answer: Option A

Solution:

The starting system includes A battery, a starter, and an ignition switch

20

The parking brake generally acts on

A) Front wheels B) Rear wheels C) Front and rear wheels D) Propeller shaft

Discuss

Answer & Solution

Answer: Option B

Solution:

The parking brake generally acts on Rear wheels

Automobile Engineering MCQ Questions & Answers | Mechanical Engineering