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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-1 section-3

Each section contains 100 MCQs on Internal Combustion Engines (I.C. Engines) .
1
In the crankcase method of scavenging, the air pressure is produced by
Discuss
Answer & Solution
Answer: Option D
Solution:
In the crankcase method of scavenging, the air pressure is produced by Movement of engine piston. This method was used for early crankcase compression two-stroke engines, as used for small motorcycles. In this method, the transfer port (or inlet port for the engine cylinder) and exhaust port are situated on the opposite sides of the engine cylinder, so that the burnt gases would be pushed out by the cross flow.
2
The increase of efficiency of a compression ignition engine, as the load decreases, is due to
Discuss
Answer & Solution
Answer: Option B
Solution:
The increase of efficiency of a compression ignition engine, as the load decreases, is due to Qualitative governing
3
In a four stroke cycle petrol engine, the charge is ignited at
Discuss
Answer & Solution
Answer: Option A
Solution:
In a four stroke cycle petrol engine, the charge is ignited at 30° before top dead center
4
The spark ignition engines are governed by
Discuss
Answer & Solution
Answer: Option C
Solution:
-The spark ignition engines are governed by Quantitative governing. -SI engines being quantitatively governed by controlling the quantity of charge inducted, leading to high throttling losses. -To qualitatively govern the engine, charge purity was reduced by incorporating EGR, thereby reducing the amount of available oxygen in the charge inducted.
5
The compression ignition engines are governed by
Discuss
Answer & Solution
Answer: Option B
Solution:
The compression ignition engines are governed by Qualitative governing. Compression ignition (CI) engines In a compression ignition engine only air or air plus residual combustion gases from the exhaust known as exhaust gas recirculation (EGR) is inducted into the chamber during the intake stroke, and compressed during the compression stroke.
6
It the temperature of intake air in I.C. engines is lowered, then its efficiency will
Discuss
Answer & Solution
Answer: Option A
Solution:
It the temperature of intake air in I.C. engines is lowered, then its efficiency will Increase
7
If the intake air temperature of I.C. engine increases, its efficiency will
Discuss
Answer & Solution
Answer: Option B
Solution:
If the intake air temperature of I.C. engine increases, its efficiency will Decrease
8
If the temperature of intake air in internal combustion engine increases, then its efficiency will
Discuss
Answer & Solution
Answer: Option B
Solution:
If the temperature of intake air in internal combustion engine increases, then its efficiency will Decrease
9
The probability of knocking in diesel engines is increased by
Discuss
Answer & Solution
Answer: Option D
Solution:
The probability of knocking in diesel engines is increased by
- High self ignition temperature
- Low volatility
- Higher viscosity
10
The pressure at the end of compression in the case of diesel engine is of the order of
Discuss
Answer & Solution
Answer: Option D
Solution:
The pressure at the end of compression in the case of diesel engine is of the order of 35 kg/cm