Question 45General Subjects - Assistant Engineer

The correct answer is A) Higher than normal discharge pressure and lower than normal displacement capacity. When a reciprocating air compressor operates at a compression ratio that exceeds its design parameters, the higher compression ratio will result in a higher than normal discharge pressure. This is because the compressor is being forced to work harder to achieve a greater pressure increase than it was designed for. However, the higher compression ratio will also reduce the compressor's displacement capacity, meaning it will draw in and discharge less air volume per cycle than its normal design. The other options are incorrect because they do not accurately describe the effects of exceeding the design compression ratio. Option B would be the opposite effect, option C would be an unlikely combination, and option D would not occur under these conditions.