Chapter 3.2: Metal Cutting Machine Tools

Which of the following is not a type of AC motor drive in the main transmission system?

• Single-speed AC motor drive

• Multi-speed AC motor drive

• Variable-speed AC motor drive

• Stepper motor drive

What is a disadvantage of stepped speed transmission?

• High power transmission

• Speed loss

• Accurate transmission ratio

• Wide speed range

Which type of transmission allows speed changes during operation?

• Stepped speed transmission

• Gear shifting transmission

• Continuous variable transmission

• Clutch-based transmission

What is a common application of stepped speed transmission?

• High-precision CNC machines

• Small and medium general-purpose machine tools

• Hydraulic systems

• Electrical servo systems

Which of the following is not a type of transmission device?

• Mechanical transmission

• Hydraulic transmission

• Electrical transmission

• Magnetic transmission

In an open-loop servo system, the control accuracy mainly depends on:

• Feedback sensors

• Step angle accuracy of the stepper motor

• Hydraulic pressure

• Gearbox efficiency

Which system uses feedback to correct position errors?

• Open-loop system

• Semi-closed-loop system

• Closed-loop system

• Stepper motor system

Where is the detector typically placed in a semi-closed-loop system?

• Directly on the worktable

• On the servo motor shaft

• On the cutting tool

• On the spindle

Which motor is commonly used in open-loop servo systems?

• DC servo motor

• AC servo motor

• Stepper motor

• Induction motor

What is an advantage of closed-loop systems over open-loop systems?

• Lower cost

• Simpler structure

• Higher positioning accuracy

• No need for feedback