7) What is the distance moved by a threaded component during one complete revolution?

8) Which of the following thread is used in ordinary bolts and nuts?

9) Find the lead of a double start thread having a pitch 1.5mm.

10) What is the included angle of the conical point of lathe centre?

11) What is the method of turning where in a cylindrical work - piece is turn to have a uniform increase or decrease in diameter along the length?