Cnc Machine

The development of first NC machine tool project was awarded to

• Harvard Lab
• USAF
• MIT
• No of these

What does CNC stands for?

• Computer network control
• Computer numerical control
• Computer nested control
• Computer numerical controller

What type of motor is used to drive a CNC machining centers axis?

• Servo
• Sling
• Derive
• Pusher

Changing of tool in spindle is atumoted in CNC

• TRUE
• FALSE

Which of the following modes support 2.5D parts

• Point-to-point
• Point-to-point straight line
• 2-axis contouring
• Drilling

The running cost of CNC is higher than coventional machine

• TRUE
• FALSE

Ribs in machine tool stucture are provided to attain

• High stiffness to weight ration
• Low stifness to wieght ratio
• High weight to stifness ratio
• Low weight to stifness ratio

The two forces that acts on spindle during operation are

• Radial and lateral
• Axial and horizontal
• Lateral and horizontal
• Radial and axial

Gray Code absolute encoder changes

• one bit a time
• two bits at a time
• three bits at a time
• four bits at a time

Tacho generator is used to measure

• Velocity
• Position
• Time
• None of these