# Power Plant Questions and Answers – Heat of Combustion – II

This set of Power Plant test focuses on “Heat of Combustion-II”.

1. The heat transferred when the H2O in the products is in the liquid state is called?
a) HCV
b) LCV
c) LHV
d) None of the mentioned

Explanation: The heat transferred when the H2O in the products is in the liquid state is called HCV [Higher Calorific Value].

2. The heat transferred when the H2O in the products is in the vapour state is called?
a) HCV
b) LCV
c) HHV
d) None of the mentioned

Explanation: The heat transferred when the H2O in the products is in the vapour state is called LCV [Lower Calorific Value].

3. The maximum temperature achieved for given reactants is called?
a) Practical Flame Temperature
b) Critical Temperature
c) Theoretical Flame Temperature
d) None of the mentioned

Explanation: Theoretical Flame Temperature is the maximum temperature achieved for given reactants.

4. Maximum Theoretical Flame Temperature corresponds to _____________
a) Partial Combustion
b) Incomplete Combustion
c) Complete combustion
d) None of the mentioned

Explanation: Maximum Theoretical Flame Temperature corresponds to Complete Combustion.

5. In pure oxygen, the maximum flame temperature is _____________
a) higher than the theoretical flame temperature
b) lower than the theoretical flame temperature
c) equal to the theoretical flame temperature
d) none of the mentioned

Explanation: In pure oxygen, the maximum flame temperature is higher than the theoretical flame temperature because of dilution effect of Nitrogen.

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6. Maximum permissible temperature in a gas turbine is?
a) Fixed
b) Variable
c) Linearly increasing
d) Linearly decreasing

Explanation: Maximum permissible temperature in a gas turbine is Fixed from metallurgical considerations.

7. Dissociation is directly proportional to temperature.
a) True
b) False

Explanation: Dissociation is directly proportional to temperature as when the temperature increases, the amount of dissociation also increases & vice-versa.

8. Spontaneity of a chemical reaction depends on?
a) Enthalpy of reaction
b) Energy of reaction
c) Gibbs Free Energy
d) None of the mentioned

Explanation: Gibbs free energy is the parameter which determines the spontaneity of the reaction after determining its randomness.

9. For exothermic reactions, free energy change is?
a) positive
b) negative
c) zero
d) none of the mentioned

Explanation: Gibbs free energy is the parameter which determines the spontaneity of the reaction after determining its randomness. For exothermic reactions, this energy difference has to be negative.

Sanfoundry Global Education & Learning Series – Power Plant Engineering.

To practice all areas of Power Plant for tests, here is complete set of 1000+ Multiple Choice Questions and Answers.

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