A spiral milling attachment is used on a milling machine. It is driven by

54) A milling attachment is mounted on a milling machine. Which one of the following is used to transmit spindle motion to the milling attachment ?

55) In a spur gear, if pitch diameter =168 mm; module = 3.25 mm, the number of teeth will be :

56) In a spur gear, if outside diameter = 300 mm; module = 5 mm, the number of teeth will be :

57) In a spur gear, if pitch diameter = 40 mm; outside diameter = 48 mm, module = 4 mm, the number of teeth will be :