This set of IC Engines Multiple Choice Questions & Answers (MCQs) focuses on “Combustion”.
1. ____________ is a chemical reaction in which certain elements of the fuel like hydrogen and carbon combine with oxygen liberating heat energy and causing an increase in temperature of the gases.
a) Compression
b) Expansion
c) Combustion
d) None of the mentioned
View Answer
Explanation: Combustion is a chemical reaction in which certain elements of the fuel like hydrogen and carbon combine with oxygen liberating heat energy and causing an increase in temperature of the gases, while expansion and compression are not reactions, in fact they are processes in a fuel cycle.
2. The conditions necessary for combustion are the presence of combustible mixture and some means of initiating the process.
a) True
b) False
View Answer
Explanation: None.
3. The process of combustion in engines generally takes place either in a homogeneous or a heterogeneous fuel vapour air mixture depending on the type of engine.
a) True
b) False
View Answer
Explanation: None.
4. In spark ignition engines a nearly ____________ mixture of air and fuel is formed in the carburettor.
a) heterogeneous
b) homogeneous
c) solid
d) none of the mentioned
View Answer
Explanation: In spark ignition engines a nearly homogeneous mixture of air and fuel is formed in the carburettor and solid and heterogeneous mixture is never used.
5. Homogeneous mixture is formed inside the engine cylinder and the combustion is initiated inside the cylinder at a particular instant towards the end of the compression stroke.
a) True
b) False
View Answer
Explanation: In fact, homogeneous mixture is formed outside the engine cylinder and the combustion is initiated inside the cylinder at a particular instant towards the end of the compression stroke.
6. In a homogeneous gas mixture the fuel and oxygen molecules are more or less, uniformly distributed.
a) True
b) False
View Answer
Explanation: Yes, homogeneous means equally distributed and in a homogeneous gas mixture the fuel and oxygen molecules are more or less, uniformly distributed.
7. The complete combustion of ____________ mixture, and droplet combustion result in the smoke and odour.
a) heterogeneous
b) homogeneous
c) solid
d) none of the mentioned
View Answer
Explanation: Not, but the incomplete combustion of heterogeneous mixture, and droplet combustion result in the smoke and odour.
8. The ____________ rate is the result of a purely chemical combination process in which the flame eats it way into the unburned charge.
a) transposition
b) reaction
c) burning
d) none of the mentioned
View Answer
Explanation: The reaction rate is the result of a purely chemical combination process in which the flame eats it way into the unburned charge while the transposition rate is due to the physical movement of the flame front relative to the cylinder wall and also the result of the pressure differential between the burning gases and the unburnt gases in the combustion chamber.
9. The ____________ rate is due to the physical movement of the flame front relative to the cylinder wall and also the result of the pressure differential between the burning gases and the unburnt gases in the combustion chamber.
a) transposition
b) reaction
c) burning
d) none of the mentioned
View Answer
Explanation: The transposition rate is due to the physical movement of the flame front relative to the cylinder wall and also the result of the pressure differential between the burning gases and the unburnt gases in the combustion chamber while the reaction rate is the result of a purely chemical combination process in which the flame eats it way into the unburned charge.
10. A pre-combustion chamber gives a shorter delay compared to an open type of combustion chamber.
a) True
b) False
View Answer
Explanation: None.
Sanfoundry Global Education & Learning Series – IC Engine.
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