Internal Combustion Engine MCQ Questions Answers Mechanical Engg

IC Engine – Mechanical Engineering Questions Answers on Internal Combustion Engine


1) The top of the piston in two-stroke engine is

a) flat

b) slanted

c) crown shaped

d) convex shaped

View Answer
Option – c)

2) The combustion in compression ignition engine is

a) homogeneous

b) heterogeneous

c) laminar

d) none of the mentioned

View Answer
Option – b)

3)The minimum number of rings in a piston are
a) cast iron

b) bronze

c) aluminium

d) White metal

View Answer
Option – a)

4)If the temperature of intake air in I.C. engine is lowered, then its efficiency will

a) increase

b) decrease

c) remain same

d) increase up to certain limit and then decrease

View Answer
Option – a)

5)Recardo’s theory is associated with

a) IC engines

b) Wankel engines

c) Steam turbines

d) None of these

View Answer
Option – a)

6)The fuel in diesel engine is normally injected at pressure of

a) 5-10 kg/cm2

b) 20-25 kg/cm2

c) 60-80 kg/cm2

d) 90-130 kg/cm2

View Answer
Option – d)

7) Compression ratio in case of CI engine is in the range of

a) 6-10

b) 16-20

c) 20-35

d) None of these

View Answer
Option – b)

8)Which one of the following is Not a necessary assumption for the air standard Otto-cycle?

a) All processes are both internally as well as externally reversible

b) Intake and exhaust processes are constant volume heat rejection processes

c) The combustion process is a constant volume heat addition process

d) The working fluid is an ideal gas with constant specific heats

View Answer
Option – b)

9)Lenoir cycle is used in

a) SI engines

b) CI engines

c) pulse jet engines

d) gas turbines

View Answer
Option – c)

10)If the intake air temperature of I.C. engine increases, its efficiency will

(a) increase

(b) decrease

(c) remain same

(d) unpredictable

(e) depend on other factors.

View Answer
Option – b)