SACA Industrial Robot Operations 4

Question 1

What is the primary purpose of a robot's Denavit-Hartenberg (DH) parameter set?

Accepted Answer

To define the kinematic relationship between consecutive joint frames

Answer

DH parameters mathematically describe the geometric relationship between adjacent links and joints, forming the basis for forward kinematics calculations.

Question 2

During a collaborative robot (cobot) risk assessment, which hazard category requires the lowest priority mitigation effort?

Accepted Answer

Residual hazards with negligible probability and minor severity

Answer

Residual hazards rated as negligible probability combined with minor severity fall at the lowest level of the risk matrix and typically require only informational labeling.

Question 3

A robot program calls a subroutine that modifies a GLOBAL variable. What is the most critical concern with this design?

Accepted Answer

Unintended side effects may corrupt data used by other routines

Answer

Global variables are accessible throughout the program, so modifying them inside a subroutine can unintentionally affect other program sections that rely on the same variable.

Question 4

Which robot motion type guarantees that the TCP follows a perfectly straight-line path between two points?

Accepted Answer

Linear interpolated motion (MOVEL)

Answer

MOVEL (linear motion) commands the controller to interpolate all joint angles simultaneously so the TCP traces a straight Cartesian line between start and end points.

Question 5

An operator notices the robot's repeatability has degraded from ±0.05 mm to ±0.3 mm over several months. What is the most likely root cause?

Accepted Answer

Mechanical wear in gearboxes or encoder backlash

Answer

Gradual degradation in repeatability over time is a classic indicator of mechanical wear in joint gearboxes, bearings, or encoder slippage rather than software or environmental factors.

SACA - Smart Automation Certification Alliance Practice Test

SACA - Smart Automation Certification Alliance Practice Test

SACA Industrial Robot Operations 4