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If a1 and a2 are the dryness fractions obtained in separating calorimeter and throttling calorimeter respectively, then the actual dryness fraction of steam will be:


1. a1a2
2. (a1 + a2)/2
3. a1 + a2
4. (a1a2)/2

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Correct Answer - Option 1 : a1a2

Explanation:

Throttling Calorimeter: A throttling calorimeter is based on the principle of throttling the wet steam so that it becomes superheated.

Separating Calorimeter: It is a vessel used initially to separate some of the moisture from the steam, to ensure superheat conditions after throttling.

Combined Separating and Throttling Calorimeter

A combined separating and throttling calorimeter is therefore found most suitable for accurate measurement of dryness of steam reducing the drawback of Separating Calorimeter (i.e. water particles from wet steam are not fully separated) and the drawback of Throttling Calorimeter (i.e. not suitable for very wet steam).

a= dryness fraction of steam considering separating calorimeter

a= dryness fraction of steam considering the throttling calorimeter

x = actual dryness fraction of steam in the sample

The actual dryness fraction of steam in the sample is:

X = a1a2

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