Question

Select the benefit of preheating the air?

(a) Increased thermal efficiency

(b) Improved oxidation

(c) Controlled steam capacity

(d) Decreased power consumption

This question was posed to me during an internship interview.

Asked question is from Boiler Mounting Accessories topic in chapter Steam Generators & Accessories of Energy Engineering

Answer 1

Correct answer is (a) Increased thermal efficiency

The explanation: Increased thermal efficiency is one of the benefits and also other benefits are

i) Improved combustion

ii) Efficient use of low grade fuel

iii) Saving in fuel consumption

iv) Increased steam generation capacity.