# Thermodynamics Questions and Answers – Measurement of Steam Quality

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

1. A pure substance is said to have ____ degrees of freedom.
a) one
b) two
c) three
d) four

Explanation: The state of a pure substance gets fixed if two independent properties are given.

2. Which of the following statement is true?
a) it is easiest to measure the temperature and pressure of a substance
b) when pressure and temperature are independent properties, they are measured to determine that state of the substance
c) it is measured in the compressed liquid region or the superheated vapour region
d) all of the mentioned

Explanation: Of all the thermodynamic properties, it is easiest to measure the temperature and pressure of a substance.

3. For a substance in two-phase region,
a) both pressure and temperature are independent properties
b) if pressure is given, the saturation temperature gets fixed
c) no other property is required to be known
d) all of the mentioned

Explanation: For a substance in two-phase region, only one out of p and t is fixed and one more property is also required.

4. Devices such as calorimeters are used to for determining the quality or enthalpy of the mixture.
a) true
b) false

Explanation: This is because it is difficult to measure the specific volume of a mixture.

5. For the measurement of quality, the state of the substance is brought from the two-phase region to
a) single-phase region
b) superheated region
c) both of the mentioned
d) none of the mentioned

Explanation: Because in these regions, both pressure and temperature are independent.
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6. To fix the state and determine the quality of the mixture, we can do this by
b) electric heating
c) both of the mentioned
d) none of the mentioned

Explanation: These are the two ways of measuring the quality of a mixture.

7. To be sure that steam after throttling is in the single-phase or superheated vapour, a minimum of ____ is desired.
a) 10 degree Celsius
b) -5 degree Celsius
c) 0 degree Celsius
d) 5 degree Celsius

Explanation: This superheat helps in ensuring that after throttling steam is in single-phase or superheated vapour region.

8. A combined separating and throttling calorimeter is also used to measure the quality.
a) true
b) false

Explanation: It is used when the steam is wet and the pressure after throttling is not low enough to take steam to the superheated region.

9. In a combined separating and throttling calorimeter,
a) steam is first passed through a separator
b) in separator, some moisture separates out due to sudden change in direction
c) then the partially dry vapour is throttled and taken to the superheated region
d) all of the mentioned

Explanation: This is how a combined separating and throttling calorimeter works.

10. The quality of wet steam can also be measured by an electric calorimeter.
a) true
b) false

Explanation: In this the sample of steam is passed in steady flow through an electric heater.

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