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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-6 section-1

Each section contains 100 MCQs on Internal Combustion Engines (I.C. Engines) .
51
The increase in intake temperature of internal combustion engines will _________ efficiency.
Discuss
Answer & Solution
Answer: Option C
Solution:
The increase in intake temperature of internal combustion engines will decrease efficiency.
52
During idling, a petrol engine requires _________ mixture.
Discuss
Answer & Solution
Answer: Option B
Solution:
During idling, a petrol engine requires rich mixture.
53
The cam shaft of a four stroke I.C. engine running at 1500 rpm will run at
Discuss
Answer & Solution
Answer: Option B
Solution:
The camshaft is either chain or gear driven from the crankshaft. Because the engine is a four stroke, the camshaft will rotate at half the speed of the crankshaft. The cam shaft of a four stroke I.C. engine running at 1500 rpm will run at 750 rpm
54
Polymerization is a chemical process in which molecules of a compound become
Discuss
Answer & Solution
Answer: Option A
Solution:
Polymerization is a chemical process in which molecules of a compound become Larger Polymerization that occurs through the coupling of monomers using their multiple bonds is called addition polymerization. The simplest example involves the formation of polyethylene from ethylene molecules.
55
The theoretically correct mixture of air and petrol is
Discuss
Answer & Solution
Answer: Option B
Solution:
The theoretically correct mixture of air and petrol is 15 : 1
56
An hmh flame speed is obtained in diesel engine when air fuel ratio is
Discuss
Answer & Solution
Answer: Option D
Solution:
An hmh flame speed is obtained in diesel engine when air fuel ratio is About 10% of rich mixture. The flame speed is the measured rate of expansion of the flame front in a combustion reaction. Whereas flame velocity is generally used for a fuel. Combustion engineers differentiate between the laminar flame speed and turbulent flame speed. Flame speed is typically measured in m/s, cm/s, etc.
57
A stoichiometric air-fuel ratio is
Discuss
Answer & Solution
Answer: Option A
Solution:
A stoichiometric air-fuel ratio is Chemically correct mixture. Air–fuel ratio (AFR) is the mass ratio of air to a solid, liquid, or gaseous fuel present in a combustion process. If exactly enough air is provided to completely burn all of the fuel, the ratio is known as the stoichiometric mixture, often abbreviated to stoich.
58
The temperature of interior surface of cylinder wall in normal operation is not allowed to exceed
Discuss
Answer & Solution
Answer: Option C
Solution:
The temperature of interior surface of cylinder wall in normal operation is not allowed to exceed 180°C
59
A two stroke cycle engine gives ________ the number of power strokes as compared to the four stroke cycle engine, at the same engine speed.
Discuss
Answer & Solution
Answer: Option C
Solution:
A two stroke cycle engine gives two the number of power strokes as compared to the four stroke cycle engine, at the same engine speed.
60
The fuel air ratio in a petrol engine fitted with suction carburettor, operating with dirty air filter as compared to clean filter will be
Discuss
Answer & Solution
Answer: Option A
Solution:
The fuel air ratio in a petrol engine fitted with suction carburettor, operating with dirty air filter as compared to clean filter will be Higher. For proper combustion of fuel, engine require oxygen, and this oxygen is supplied to engine by atmospheric air. The ratio of mass of air sucked by engine to mass of fuel injected is air-fuel ratio.