Discussion
A combustor delivers 1500 K where the turbine limit is 1450 K. The required reduction in exit temperature is
Answer: B
Correct answer: 50 K, about 3.3 per cent
The difference is \( 1500 - 1450 = 50 \) K, and as a fraction of the delivered temperature \[ \frac{50}{1500} = 0.033 = 3.3\ \text{per cent.} \] Taking it as a fraction of 1450 gives 3.4 per cent, which is the other option offered - the base must be stated, and here it is the temperature to be reduced.
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