# Thermodynamics Questions and Answers – Steam Tables

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This set of Thermodynamics Multiple Choice Questions & Answers (MCQs) focuses on “Steam Tables “.

1. The properties of water are arranged in the steam tables as functions of
a) pressure
b) temperature
c) pressure and temperature
d) none of the mentioned

Explanation: The properties of water are arranged in steam tables as functions of both pressure and temperature.

2. The internal energy of saturated water at the triple point is
a) 1
b) 0
c) -1
d) infinity

Explanation: This value is arbitrarily chosen.

3. The entropy of saturated water is chosen to be zero at triple point.
a) true
b) false

Explanation: This is arbitrarily chosen and form the basic assumptions for steam tables.
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4. When a liquid and its vapour are in equilibrium at a certain pressure and temperature, then which of the following is required to identify the saturation state.
a) pressure
b) temperature
c) both pressure and temperature
d) pressure or temperature

Explanation: If one of the quantity is given, then other gets fixed.

5. Saturated liquid or the saturated vapour has how many independent variables?
a) one
b) two
c) three
d) none of the mentioned

Explanation: Only one property is required to be known to fix up the state.

6. If data are required for intermediate temperatures or pressures, linear interpolation is normally accurate.
a) true
b) false

Explanation: To reduce the amount of interpolation required, two tables are provided.

7. For a liquid-vapour mixture, which of the following can give us all the properties of the mixture?
a) p or t and the quality of the mixture are given
b) p or t and any one of the property is given
c) both of the mentioned
d) none of the mentioned

Explanation: In first case, properties can be directly evaluated and in second case we can find the quality first and then evaluate all other properties.

8. When does a vapour become superheated?
a) when the temperature of vapour is less than the saturation temperature at given pressure
b) when the temperature of vapour is more than the saturation temperature at given pressure
c) when the temperature of vapour is equal to the saturation temperature at given pressure
d) none of the mentioned

Explanation: For a superheated vapour, temperature of vapour must be greater than the saturation temperature.

9. The superheat or degree of superheat is given by
a) difference between the temperature of saturated liquid and saturation temperature
b) difference between the temperature of superheated vapour and saturation temperature
c) sum of the temperature of superheated vapour and saturation temperature
d) none of the mentioned

Explanation: Superheat= T1(temperature of superheated vapour) – T(saturated).

10. When the temperature of a liquid is less than the saturation temperature at the given pressure, the liquid is called compressed liquid.
a) true
b) false

Explanation: For a compressed liquid, temperature of liquid must be less than the saturation temperature.

11. The properties of liquid _____ with pressure.
a) do not vary
b) vary largely
c) vary little
d) none of the mentioned

Explanation: This is the reason why properties are taken from the saturation tables at the temperature of the compressed liquid.

12. Which of the following statement is true?
a) a subcooled liquid is one which is cooled below its saturation temperature at a certain pressure
b) subcooling is the difference between the saturation temperature and the actual liquid temperature
c) both of the mentioned
d) none of the mentioned

Explanation: This is what a subcooled liquid means.

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