200) When two pulleys are connected by means of an open belt drive, then both the pulleys will rotate is opposite directions.

201) A mechanism consisting of four links is called a __________ mechanism.

202) The amplitude of vibration is always __________ the radius of the circle.

203) An involute pinion and gear are in mesh. If both have the same size of addendum, then there will be an interference between the

204) In vibration isolation system, if ?/?_n > 1, then the phase difference between the transmitted force and the disturbing force is