SACA Robotics and Automation 4 — Questions and Answers
Question 1: Which robot configuration is best suited for tasks requiring a large spherical work envelope with high reach?
- Cartesian robot
- SCARA robot
- Articulated arm robot (Correct answer)
- Delta robot
Correct answer: Articulated arm robot
Articulated arm robots mimic the human arm with multiple rotational joints, providing a large, flexible spherical work envelope.
Question 2: In industrial automation, what does the term 'jerk' refer to when describing robot motion?
- Sudden mechanical failure
- Rate of change of acceleration (Correct answer)
- Maximum torque applied to a joint
- Vibration frequency of the end-effector
Correct answer: Rate of change of acceleration
Jerk is the rate of change of acceleration over time, and controlling it helps reduce mechanical stress and improve motion smoothness.
Question 3: A pick-and-place robot must select parts from a moving conveyor. Which sensor technology is most commonly used to locate and identify parts on the moving belt?
- Ultrasonic sensor
- Machine vision camera system (Correct answer)
- Inductive proximity sensor
- Capacitive sensor
Correct answer: Machine vision camera system
Machine vision camera systems can identify part position, orientation, and type on a moving conveyor, enabling accurate pick-and-place operations.
Question 4: What is the primary advantage of using a parallel kinematic robot (e.g., Delta robot) over a serial kinematic robot for high-speed pick-and-place?
- Greater payload capacity
- Larger workspace coverage
- Higher speed and acceleration due to lower moving mass (Correct answer)
- Better suitability for heavy welding tasks
Correct answer: Higher speed and acceleration due to lower moving mass
Parallel kinematic robots have their actuators fixed to the base, so the moving structure has low inertia, enabling very high speeds and accelerations.
Question 5: In robot programming, what is a 'singularity'?
- A position where the robot reaches maximum speed
- A configuration where the robot loses one or more degrees of freedom (Correct answer)
- A calibration reference point for the robot
- The home position of the robot arm
Correct answer: A configuration where the robot loses one or more degrees of freedom
A singularity is a robot configuration where two or more joint axes become aligned, causing a loss of a degree of freedom and unpredictable motion.
Question 6: Which collaborative robot (cobot) safety feature allows the robot to detect unexpected contact forces and stop immediately?
- Speed monitoring
- Power and force limiting (PFL) (Correct answer)
- Safety-rated monitored stop
- Hand guiding mode
Correct answer: Power and force limiting (PFL)
Power and force limiting (PFL) is a cobot safety function that continuously monitors forces and stops the robot if contact forces exceed safe thresholds.
Question 7: A robot end-effector uses vacuum cups to pick up flat cardboard boxes. Which factor is most critical to ensure reliable suction gripping?
- Box color and surface finish
- Box weight distribution and surface porosity (Correct answer)
- Ambient temperature and humidity
- Robot joint torque limits
Correct answer: Box weight distribution and surface porosity
Vacuum gripper effectiveness depends heavily on surface porosity (air leakage) and weight distribution to ensure even suction force across all cups.
SACA Robotics and Automation 4
Which robot configuration is best suited for tasks requiring a large spherical work envelope with high reach?