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Internal Combustion Engines (I.C. Engines) MCQ Questions & Answers | Mechanical Engineering

Learn Internal Combustion Engines (I.C. Engines) MCQ questions & answers are available for a Mechanical Engineering students to clear GATE exams, various technical interview, competitive examination, and another entrance exam. Internal Combustion Engines (I.C. Engines): MCQ question is the important chapter for a Mechanical Engineering and GATE students. Page-5 section-2

Each section contains 100 MCQs on Internal Combustion Engines (I.C. Engines) .
41
Supercharging is the process of
Discuss
Answer & Solution
Answer: Option A
Solution:
Supercharging is the process of Supplying the intake of an engine with air at a density greater than the density of the surrounding atmosphere
42
A carburettor is used to supply
Discuss
Answer & Solution
Answer: Option D
Solution:
A carburettor is used to supply petrol and air
43
The fuels in order of decreasing knock tendency for spark ignition engines are
Discuss
Answer & Solution
Answer: Option B
Solution:
The fuels in order of decreasing knock tendency for spark ignition engines are Paraffin, napthene, aromatic
44
The knocking tendency in compression ignition engines for a given fuel will be
Discuss
Answer & Solution
Answer: Option A
Solution:
The knocking tendency in compression ignition engines for a given fuel will be Enhanced by decreasing compression ratio. In SI engine, knocking tendency increases with increase in compression ratio. ... In CI engine, knocking tendency decreases with increase in compression ratio. If compression ratio is low in CI engine, there will not be enough temperature generation for ignition of the fuel air mixture.
45
Which of the following is false statement?
Some of the methods used to reduce diesel smoke are as follows
Discuss
Answer & Solution
Answer: Option B
Solution:
Some of the methods used to reduce diesel smoke are as follows:
- Using additives in the fuel
- Adherence to proper fuel specification
- Avoidance of overloading
46
Pre-ignition is caused by the spontaneous combustion of the mixture before the end of the compression stroke, and is due to
Discuss
Answer & Solution
Answer: Option D
Solution:
Pre-ignition is caused by the spontaneous combustion of the mixture before the end of the compression stroke, and is due to
- Cylinder walls being too hot
- Overheated spark plug points
- Red hot carbon deposits on cylinder walls
47
If the compression ratio in I.C. engine increases, then its thermal efficiency will
Discuss
Answer & Solution
Answer: Option B
Solution:
If the compression ratio in I.C. engine increases, then its thermal efficiency will Increase
48
The minimum cranking speed in case of petrol engine is about
Discuss
Answer & Solution
Answer: Option D
Solution:
The minimum cranking speed in case of petrol engine is about 60 - 80 rpm
49
The injection pressure in a diesel engine is about
Discuss
Answer & Solution
Answer: Option B
Solution:
The injection pressure in a diesel engine is about 100 bar
50
The specific fuel consumption per B.P. hour for a petrol engine is about
Discuss
Answer & Solution
Answer: Option B
Solution:
The specific fuel consumption per B.P. hour for a petrol engine is about 0.25 kg