Correct option is C
The clearance ratio in a single-stage compressor refers to the ratio of the clearance volume (the volume remaining in the cylinder when the piston is at the top of its stroke) to the swept volume (the volume displaced by the piston during a stroke). The clearance ratio affects the efficiency and performance of the compressor.
For single-stage compressors, the clearance ratio typically lies between 4% and 10%, depending on the design and application of the compressor. This range ensures that the compressor operates efficiently without excessive re-expansion of the compressed gas.
15% to 20% and 20% to 30% are too high for typical single-stage compressors.
1% to 2% is too low for most practical applications.
Thus, the correct range for the clearance ratio in a single-stage compressor is 4% and 10%.
