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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.

Each section contains 100 MCQs on Internal Combustion Engines (I.C. Engines) .
1
Engine pistons are usually made of aluminium alloy because it
Discuss
Answer & Solution
Answer: Option A
Solution:
Engine pistons are usually made of aluminium alloy because it Is lighter Aluminium alloy are used because they are lighter.
2
The reason for supercharging in any engine is to
Discuss
Answer & Solution
Answer: Option C
Solution:
The reason for supercharging in any engine is to Reduce weight and bulk for a given output -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.
3
Morse test can be conducted for
Discuss
Answer & Solution
Answer: Option C
Solution:
Morse test can be conducted for Multi cylinder engines The purpose of Morse test is to obtain the approximate indicated power of a Multi cylinder engine. It consist of running the engine against the dynamo-meter at a particular speed, cutting out the firing of each cylinder in turn and noting the fall in BP each time while maintaining the speed constant.
4
The cetane (C16H34) which is a straight chain paraffin, is assigned a cetane number of
Discuss
Answer & Solution
Answer: Option C
Solution:
The cetane (C16H34) which is a straight chain paraffin, is assigned a cetane number of 100.
5
Alpha-methyl-naphthalene (C11H10) has a cetane number of
Discuss
Answer & Solution
Answer: Option A
Solution:
Alpha-methyl-naphthalene (C11H10) has a cetane number of 0.
6
The scavenging efficiency of a four stroke cycle diesel engine is
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. The scavenging efficiency of a four stroke cycle diesel engine is Between 95 and 100%
7
Scavenging is usually done to increase
Discuss
Answer & Solution
Answer: Option C
Solution:
Scavenging is a process of pushing exhaust gas out of the cylinder and drawing in fresh draught of air or air fuel mixture for the next cycle. Scavenging is usually done to increase power output
8
Which of the following medium is compressed in a Diesel engine cylinder?
Discuss
Answer & Solution
Answer: Option A
Solution:
Air Alone is compressed in a Diesel engine cylinder
9
Number of working strokes per min. for a four stroke cycle engine are _________ the speed of the engine in r.p.m.
Discuss
Answer & Solution
Answer: Option B
Solution:
Number of working strokes per min. for a four stroke cycle engine are one half the speed of the engine in r.p.m.
10
Number of working strokes per min. for a two stroke cycle engine is _________ the speed of the engine in r.p.m.
Discuss
Answer & Solution
Answer: Option A
Solution:
Number of working strokes per min. for a two stroke cycle engine is equal to the speed of the engine in r.p.m.