36) In a metric outside micrometer, half rotating of the thimble gives the longitudinal movement of the spindle equal to :

37) What device is used to remove the drill easily from the socket at the end of the drilling work ?

38) When the taper shank of the drill is larger than the machine spindle, it is fitted by means of :

39) How many taps are in one tap set ?

40) In the case of blind hole, which type of tap must be used ?