open belt drive is recommended

crossed belt drive is recommended

both open belt drive and crossed belt drive is recommended

the drive is recommended depending upon the torque transmitted

the tip of a tooth of a mating gear digs into the portion between base and root circles

gears do not move smoothly in the absence of lubrication

pitch of the gears is not same

gear teeth are undercut

fluctuation of speed

maximum fluctuation of speed

coefficient of fluctuation of speed

none of these

The interference is inherently absent.

The variation in centre distance of shafts increases radial force.

A convex flank is always in contact with concave flank.

The pressure angle is constant throughout the teeth engagement.

vertically and parallel

vertically and perpendicular

horizontally and parallel

horizontally and perpendicular