Question 395Steam Plants - Assistant Engineer

The correct answer is C) 90%. The quality of a steam mixture is a measure of the proportion of dry, saturated steam in the mixture. In this case, the mixture consists of 90% steam and 10% moisture. Therefore, the quality of the mixture is 90%, as the steam component makes up 90% of the total. The other options are incorrect because: A) 10% would represent the proportion of moisture, not the quality of the steam. B) 80% does not accurately reflect the given composition of the mixture. D) 100% would indicate that the mixture is entirely dry, saturated steam, which is not the case here.