17) Which G-code is used for tapping left hand thread with thread M4 in CNC program?

G 74

G 84

G 28

G 9

Answer is:

G 84

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18) What is the composition of stellite tool material?

Cobalt, Chromium and Tungsten

Cobalt, Nikel and Tungsten

Cobalt, Chromium and Nikel

Cobalt, Carbon and Tungsten

Answer is:

Cobalt, Chromium and Tungsten

19) Which is the tool selection word is specified?

G-Allowed by 5 digit numbers

F-Allowed by 5 digit numbers

S-Allowed by 5 digit numbers

T-Allowed by 5 digit numbers

Answer is:

T-Allowed by 5 digit numbers

20) What is the expansion of CAD?

Computer Aided Development

Computer Aided Design

Computer Automatic Development

Computer Automatic Design

Answer is:

Computer Aided Design

21) Which is the disadvantage of NC system?

Accuracy cannot be a change

Increase compound rejection

Skilled operator involves

If tape is spoiled, entire program is affected

Answer is:

If tape is spoiled, entire program is affected

Explanation:

Numerical Control (NC) refers to the method of controlling the manufacturing operation by means of directly inserted coded numerical instructions into the machine tool.

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