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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-1

Each section contains 100 MCQs on Internal Combustion Engines (I.C. Engines) .
41
Fuel oil consumption guarantees for I.C. engine are usually based on
Discuss
Answer & Solution
Answer: Option B
Solution:
Fuel oil consumption guarantees for I.C. engine are usually based on High heat value of oil
42
The thermal efficiency of diesel engines on weak mixtures is
Discuss
Answer & Solution
Answer: Option C
Solution:
The thermal efficiency of diesel engines on weak mixtures is higher. compression-ignition engines are more fuel efficient (upto 30%) than their gasoline counterparts. diesel has more long chain hydrocarbons, which is 15 percent more energy dense than gasoline.
43
In compression ignition engines, swirl denotes a
Discuss
Answer & Solution
Answer: Option B
Solution:
In compression ignition engines, swirl denotes a Rotary motion of the gases in the chamber. In compression ignition engines, swirl denotes a rotary motion of the gases in the chamber as swirl is always related to rotary motion. Inject fuel in a chamber of high pressure at the end of compression stroke.
44
In a four stroke cycle diesel engine, the compression
Discuss
Answer & Solution
Answer: Option A
Solution:
In a four stroke cycle diesel engine, the compression Starts at 40° after bottom dead center and ends at 10° before top dead center
45
In a four stroke cycle petrol engine, the compression
Discuss
Answer & Solution
Answer: Option A
Solution:
In a four stroke cycle petrol engine, the compression Starts at 40° after bottom dead centre and ends at 30° before top dead centre
46
In a four stroke cycle diesel engine, the inlet valve
Discuss
Answer & Solution
Answer: Option A
Solution:
In a four stroke cycle diesel engine, the inlet valve Opens at 20° before top dead center and closes at 40° after bottom dead center
47
In a four stroke cycle petrol engine, the inlet valve
Discuss
Answer & Solution
Answer: Option B
Solution:
In a four stroke cycle petrol engine, the inlet valve Opens at 20° before top dead center and closes at 40° after bottom dead center
48
In order to eliminate knocking in compression ignition engines, there should be
Discuss
Answer & Solution
Answer: Option A
Solution:
In order to eliminate knocking in compression ignition engines, there should be short delay period.
- Add 1% of ethyl nitrate or any nitrate to accelerate the combustion of fuel. This process is known as “Doping” and reduce delay period considerably and hence prevent diesel knock.
- For spontaneous ignition of the fuel, we require much higher temperature this can be achieved by raising the compression ratio.
49
The normal heptane (C7H16) is given a rating of ________ octane number.
Discuss
Answer & Solution
Answer: Option A
Solution:
The normal heptane (C7H16) is given a rating of 0 octane number.
50
In order to mix air and petrol in the required proportion and to supply it to the engine during suction stroke, then _________ is employed.
Discuss
Answer & Solution
Answer: Option C
Solution:
In order to mix air and petrol in the required proportion and to supply it to the engine during suction stroke, then carburettor is employed.