68.
The operation making a cone shaped enlargement of the end of a hole is known as :
(ಸ) counter sinking (18) counter boring
(0 trepanning (0) spot facing
69. Which of the following operation is first ٥٣٥۶0۶۰
(0) spot facing (2) 001%
{C) tapping { (0) drilling
70. 'The drill mainly used in drilling brass, copper or softer material :
(५) flat drill () straight fluted drill
(C) parallel shank twist drill (12) tapered shank twist dri....
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