CRE CRE Sensors, Vision & Perception

Question 1

A rotary encoder mounted on a robot joint primarily measures:

Accepted Answer

Joint angular position or displacement

Answer

Encoders convert mechanical rotation into electrical pulse counts, providing the controller with precise joint position feedback.

Question 2

A force/torque sensor mounted at the robot's wrist is used to:

Accepted Answer

Detect contact forces and moments during manipulation or assembly

Answer

Wrist-mounted force/torque sensors measure all six components of contact forces and moments, enabling compliant control and safe contact detection.

Question 3

LiDAR sensors measure distance by:

Accepted Answer

Emitting laser pulses and measuring their round-trip time of flight

Answer

LiDAR calculates range by precisely timing the interval between emitting a laser pulse and receiving its reflection from a surface.

Question 4

An Inertial Measurement Unit (IMU) combines which two sensor types?

Accepted Answer

Accelerometers and gyroscopes

Answer

IMUs integrate accelerometers measuring linear acceleration with gyroscopes measuring angular rate to estimate orientation and motion state.

Question 5

Proximity sensors in industrial robot cells are most commonly used for:

Accepted Answer

Detecting object presence without physical contact

Answer

Proximity sensors detect nearby objects using inductive, capacitive, or optical principles, triggering signals without requiring physical contact.

CRE - Certified Robotics Engineer Practice Test