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 Match List I with List II and select the correct answer:                                   

List I (NC machine tool system)

A. NC system

B. CNC system

C. DNC system

D. Machining centre

List II( Features)

1. It has an integrated automatic tool changing unit and a component indexing device

2. A number of machine tools are controlled by a computer. No tape reader, the part programme is transmitted directly to the machine tool from the computer memory

3. The controller consists of soft-wired computer and hard-wired logic system. Graphic display of tool path is also possible

4. The instructions on tape is prepared in binary decimal form and operated by a series of coded instructions

Codes:

    A        B         C         D

(a) 4        2          3          1

(b) 1        3          2          4

(c) 4        3          2          1

(d) 1        2          3          4         

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