CRS Sensors, I/O & Vision Systems

Question 1

Which type of sensor is most commonly used to measure the rotary position of a robot joint?

Accepted Answer

Incremental or absolute encoder

Answer

Encoders (incremental or absolute) convert shaft rotation into digital position feedback, providing the precise joint angle data required for robot motion control.

Question 2

What is the primary purpose of a force/torque sensor mounted at a robot's wrist?

Accepted Answer

To detect and respond to contact forces during task execution

Answer

A wrist-mounted force/torque sensor measures the forces and moments applied at the tool, enabling compliant motion, assembly tasks, and collision detection.

Question 3

An inductive proximity sensor will reliably detect which type of target?

Accepted Answer

Ferrous or non-ferrous metallic objects

Answer

Inductive proximity sensors generate an electromagnetic field and detect eddy currents induced in electrically conductive (metallic) targets only.

Question 4

In a robotic I/O system, what is the function of a sourcing (PNP) digital output?

Accepted Answer

It supplies voltage to the load when active

Answer

A sourcing (PNP) output provides the positive supply voltage to the connected load, completing the circuit through the load to the common ground.

Question 5

What does an absolute encoder provide that an incremental encoder does not?

Accepted Answer

A unique position value at every shaft angle without requiring a homing cycle

Answer

An absolute encoder outputs a unique digital code for every angular position, so the robot always knows its exact joint angle even after a power loss, eliminating homing.

CRS - Certified Robotic Specialist Practice Test

CRS - Certified Robotic Specialist Practice Test

CRS Sensors, I/O & Vision Systems