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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-2 section-1

Each section contains 100 MCQs on Internal Combustion Engines (I.C. Engines) .
11
The thermodynamic cycle on which the petrol engine works, is
Discuss
Answer & Solution
Answer: Option A
Solution:
The thermodynamic cycle on which the petrol engine works, is Otto cycle
12
The thermal efficiency of petrol and gas engines is about
Discuss
Answer & Solution
Answer: Option B
Solution:
The thermal efficiency of petrol and gas engines is about 30%
13
The thermal efficiency of diesel engines is about
Discuss
Answer & Solution
Answer: Option D
Solution:
The thermal efficiency of petrol and gas engines is about 30% and the thermal efficiency of diesel engines is about 70%.
14
The size of inlet valve of an engine in comparison to exhaust valve is
Discuss
Answer & Solution
Answer: Option A
Solution:
The size of inlet valve of an engine in comparison to exhaust valve is more
15
A spark plug gap is kept from
Discuss
Answer & Solution
Answer: Option A
Solution:
A spark plug gap is kept from 0.3 to 0.7 mm
16
When crude oil is heated, then which of the following hydrocarbon is given off first?
Discuss
Answer & Solution
Answer: Option D
Solution:
Heating oil is made from crude oil Heating oil is a petroleum product refined from crude oil. Heating oil and diesel fuel are closely related products called distillates. Heating oil is a distillate fuel sold mainly for use in boilers, furnaces, and water heaters. When crude oil is heated, then natural gas is given off first
17
Which one of the following event would reduce volumetric efficiency of a vertical compression ignition engine?
Discuss
Answer & Solution
Answer: Option B
Solution:
Inlet valve closing before bottom dead center would reduce volumetric efficiency of a vertical compression ignition engine. -It should be quite clear that the volumetric efficiency decreases at higher rpm because the process of pushing the exhaust gases out and sucking the fresh charge inside cylinder gets lesser and lesser time.
18
Which of the following does not relate to a compression ignition engine?
Discuss
Answer & Solution
Answer: Option D
Solution:
carburettor is a device that mixes air and fuel for internal combustion engines in the proper air–fuel ratio for combustion.
19
Which of the following does not relate to a spark ignition engine?
Discuss
Answer & Solution
Answer: Option D
Solution:
Fuel injection is the introduction of fuel in an internal combustion engine, most commonly automotive engines, by the means of an injector.
20
The output of a diesel engine can be increased without increasing the engine revolution or size in following way
Discuss
Answer & Solution
Answer: Option D
Solution:
A supercharger is an air compressor that increases the pressure or density of air supplied to an internal combustion engine. This gives each intake cycle of the engine more oxygen, letting it burn more fuel and do more work, thus increasing power.