1. In CNC machine tools, the motors used to control feed rate are: A Servo motors B. Induction motors C. Stepper motors D. Hydraulic motors 2. The purpose of a feedback device in a CNC machine tool is to provide information of: A. Speed B. Displacement C. Force D. Both speed and displacement 3. Federate on a machining center can be specified in: A. Only feed per revolution B. Either feed per minute or feed per revolution C. Only feed per minute D. Feed per tooth per revolution 4. The correct syntax of an NC block for inclined line milling operation is: A N-G01 X-F--- B. N-G01 Z-F C. N-G01 X-Y-F D. N-G01 M-X-Y--F--- 5. When the contour or continuous path system is used, A. Tool movement from one point to the next does not have to follow a specific path. B. Tool travel is controlled along one axis at a time. C. Machine and tool movements are precisely controlled at all times and in all planes. D. None of the above. 6. Which of the following NC blocks is correct? A. N10 G01 M03 X90 Y-15 R22 B. N10 G02 M06 Y15 $800 C. N10 G00 X100 Y85 $1000 D. N10 G02 M03 Y-22 FO.2 S1200 7. A stepper motor: A. Can control the angular displacement quite precisely B. Cannot control the angular displacement precisely C. Cannot be used for positioning of tables and tools in CNC machine tools D. Cannot be readily interfaced with microprocessor-based controller 8. Program coordinates that are based on a fixed origin are called: A. Incremental B. Absolute C. Cartesian D. Relative

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Synchronous Motor

The synchronous motor is an AC electric type motor where at a steady-state the shaft rotation is synchronized with the supply current variable-frequency. To an integral number of AC cycles, the rotation period is exactly equal. The stator of the motor in the synchronous motor contains multi-phase AC electromagnets due to which a magnetic field is created that rotates in time with the oscillation of the line current. The rotor contains a permanent magnet and the rotor rotates in synchronization with the stator field at the same rate and provides the second synchronized magnetic field which is rotating in nature as a result. When the synchronous motor is supplied with independently excited multi-phase AC electromagnets on both the rotor and the stator, it is termed as a doubly-fed machine. The most widely used AC-type motors are the synchronous AC motor and the induction AC motors.