Isothermal compression effeicency can be attained by running the compressor__________________?

(A) at very high speed (X)
(B) at very slow speed ()
(C) at average speed (X)
(D) at zero speed (X)
(E) isothermally (X)

Answers: Isothermal compression effeicency can be attained by running the compressor at very slow speed.