Industrial Robotics Quiz

QUESTIONS

1. Identify four types of robots by their coordinate systems.
2. Explain an advantage and a disadvantage of a continuous-path robot.
3. Explain the advantage of using XYZ control for a robot program.
4. Why are computer numerical control (CNC) systems discussed with robot systems?
5. Discuss the advantages and disadvantages between electric, hydraulic, and pneumatic robots.

TRUE or FALSE

1. Stop blocks are used with pneumatic cylinders to provide an intermediate stop when a cylinder is extended.
2. Robots need a special electronic circuit called an input module to accept a current-source signal, a current-sink signal, or a 120 volt AC signal.
3. The input signal to the robot is isolated by stop blocks so that they don't damage the robot bus.
4. Robot output signals provide isolation between the robot and the output signal user with optoelectronic devices.
5. Input and output circuits in modern robots are mounted in modules to make them easier to remove and replace when they are suspected of being faulty.

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MULTIPLE CHOICE

1. Robots may use as actuators ____.
   1. dc motors
   2. ac motors
   3. hydraulic actuators
   4. pneumatic actuators
   5. all the above
   6. only a and b
2. A teach pendant allows a technician to ____.
   1. jog the robot.
   2. make program changes.
   3. determine if dc motor brushes are bad.
   4. all the above.
   5. only a and b.
3. Stop blocks are used with a pneumatic arm on a robot to ______.
   1. protect output devices from transient voltages.
   2. provide intermediate stops for a pneumatic cylinder.
   3. provide an emergency stop function for pneumatic robots.
4. The PLC provides an ideal interface between multiple robots in a work cell because ______.
   1. the PLC program is a continuous-scan program and the robot program is sequential.
   2. the PLC has input and output modules and most robots don't .
   3. the PLC can handle both ac and dc signals and most robots can't .
   4. all the above.
5. The robot cabinet provides a location to mount .
   1. amplifiers for the actuators.
   2. input and output modules for input and output signals.
   3. power supplies for amplifiers, motors, and I/O signals.
   4. all the above.

PROBLEMS

1. Sketch a typical DC amplifier for a dc robot motor and explain how all of the parts of the amplifier operate.
2. Sketch a typical AC amplifier for an ac robot motor and explain how all of the parts of the amplifier operate.
3. Use the diagram of the robot cabinet in this figure and list all the main parts included in the cabinet and explain their functions.
4. Use the robot in this diagram and identify its basic parts and explain the function of each.
5. Sketch the following circuits for output signals from robots: current source, current sink, and 120 volt AC signal.
6. Sketch the following circuits for input signals to the robot and explain the current flow: a current-source circuit, a current-sink circuit, and a circuit for a 120 volt AC signal.
7. Use this diagram and explain how the position feedback loop is used with the velocity feedback loop to move the robot axis at the correct speed to the correct location.