Machinist Grinder 4th Sem Module 7 : CNC Safety and M/c Element

What is marked as 'x'?

• Machine control unit

• Program

• Machine tool

• Servo motor

What is the advantage of CNC?

• Higher initial cost
• Higher repeatability and Accuracy
• Higher inspection rate
• Highly skilled operator

Which classification is based on feedback control system?

• Absolute positioning system
• Closed loop system
• Positional system
• Incremental positioning system

What is the advantage of ball screw for feed drive?

• Motor drive only
• More cost
• Higher accuracy
• High power requirement

Which type control system is gives axis position value on monitor?

• Position control
• Closed loop control
• Pulse frequency
• Open loop control

What is the function of G00?

• Linear motion with feed rate
• Rapid motion
• Clockwise direction
• Counter clock wise direction

Which is the CNC language?

• Binary code
• Assembly language
• G-code and M-code
• Machine language

What is the principle of CNC?

• Control by auto mechanism
• Control by program
• Control by operator
• Control by cam’s

Which is the disadvantage of CNC?

• Reduce inspection time
• Rejection almost nil
• High initial cost
• High accuracy

How CNC is classified for circuit technology?

• Electric system
• Analog and Digital system
• Hydraulic system
• Positional system