Steam and Gas Turbines Quiz on “Physical Characteristics of Combustion and Reactive Mixtures, Pressure Losses”.
1. Inert character of nitrogen __________ the commercial value of gas.
a) decreases
b) increases
c) remains same
d) none of the mentioned
Answer: a
Clarification: Inert character of nitrogen decreases the commercial value of gas. Inert gases can not be used in all circumstances.
2. Carbon dioxide released is __________ in nature.
a) not corrosive
b) corrosive
c) depends on the usage
d) none of the mentioned
Answer: b
Clarification: Carbon dioxide released from combustion has corrosive properties.
3. Hydrogen sulfide released during combustion is __________ in nature.
a) not corrosive
b) corrosive
c) depends on the usage
d) none of the mentioned
Answer: b
Clarification: Hydrogen sulfide released during combustion have corrosive properties.
4. In combustion it is assumed that there is ____________
a) atomic attraction
b) no atomic attraction
c) molecular attraction
d) none of the mentioned
Answer: a
Clarification: From kinetic theory of gases it is assumed that atomic attractions are negligible.
5. In combustion it is assumed that the number of molecules for unit volume is ___________
a) constant
b) decreased
c) increased
d) none of the mentioned
Answer: c
Clarification: From kinetic theory of gases it is assumed that the number of molecules for unit volume are constant. Volume and density does not change on phase change is occurred.
6. In combustion between two shocks motion is rectilinear.
a) True
b) False
Answer: a
Clarification: In combustion between two shocks motion is rectilinear.
7. Euken number is introduced in _______ atomic gases.
a) mono
b) poly
c) di
d) none of the mentioned
Answer: b
Clarification: Euken number is introduced in poly atomic gases and mono atomic gases also.
8. For mono atomic gases euken number is approximately _________
a) 5
b) 3
c) 4
d) 2.5
Answer: d
Clarification: For mono atomic gases euken number is approximately 2.5
9. Inter changeability of gases gives _________
a) wobbe index
b) euken number
c) wobbe index & euken number
d) none of the mentioned
Answer: a
Clarification: Wobbe index gives interchangeability of gases during combustion.
10. Methane number is used to define auto ignition.
a) True
b) False
Answer:a
Clarification: Methane number is used to define auto ignition.