55) The quality of surface finish that can be achieved on a milling machine is

N4 to N11

N3 to N6

N2 to N4

N11 to N12

Answer is:

N4 to N11

ISRO Technician-B Machinist Question Paper - 2016 (Set -1) with Answer Key

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56) CNC Machines are best suited for _____ production

mass

one-off

batch

all of these

Answer is:

batch

CNC Machines are best suited for _____ production

57) Circular profiles can be produced on a CNC using _____ code.

G09

G03

G08

G06

Answer is:

G03

Explanation:

G00 - Move in a straight line at rapids speed.
G01 - Linear Interpolation at specified feed rate.
G02 - Circular Interpolation (Clockwise)
G03 - Circular Interpolation (Counter-Clockwise)

Circular profiles can be produced on a CNC using _____ code.

58) An ATC plays a significant role in reducing

Idle time

Tool time

Control time

Actual Time Cutting

Answer is:

Idle time

Explanation:

An Automatic tool changer or ATC is used in computerized numerical control (CNC) machine tools to improve the production and tool carrying capacity of the machine. ATC changes the tool very quickly, reducing the non-productive time. Hence ATC plays a significant role in reducing Idle time.