In an Ideal Brayton Cycle with Regeneration, Air Is Compressed

Multiple Choice

In an ideal Brayton cycle with regeneration, air is compressed from 80 kPa and 10°C to 400 kPa and 180°C, is heated to 450°C in the regenerator, and then further heated to 1200°C before entering the turbine. Under cold air standard conditions, the effectiveness of the regenerator is

A) 26%
B) 42%
C) 65%
D) 57%
E) 89%