For a Helical Rotor Design rotary compressor which of the following statements is true?
a) The compressor consists of 3 opposing grooved rotors.
b) The driving rotor has less helical lobes than the driven rotor has flute.
c) The vapour is drawn in via the closed space between the driving rotor and the casing.
d) The cylinders around the rotor screws must be considerably larger in diameter than the screws.
e) All of the above
Answer: B