10 exam-style questions with answers and explanations, straight from our 1,030-question bank. Tap an answer to check yourself. When you're ready, take the scored version in the free practice test.
These 10 free FR questions are organized by exam domain, so you can see how each part of the Fundamentals of Robotics blueprint is tested. Reveal the answer and explanation under each question.
At a cell's external control station, an operator sees the robot moving toward a coworker who is in its path. The emergency-stop actuator is within reach. Which action takes priority?
Correct answer: A - Activate the emergency stop and warn the coworker.
A technician must replace a pneumatic gripper seal. The program is stopped and the robot's electrical disconnect is open, but the separate compressed-air supply remains connected. A suspended fixture could descend if pneumatic pressure is lost. Before opening the gripper, the technician must:
Correct answer: A - Secure the fixture, lock out electrical and air supplies, release trapped pressure, and verify isolation.
A robot's specifications permit 6.0 kg of attached mass and an external static bending moment of 8.0 N·m about the horizontal wrist axis under review. A 2.0 kg gripper has its center of mass 0.10 m horizontally from that axis; a 3.0 kg part has its center of mass 0.25 m horizontally from the same axis. Both lie on the same side. Use g = 10 N/kg. Which assessment is correct for this static pose?
Correct answer: D - 5.0 kg and 9.5 N·m: mass is acceptable; the moment is excessive.
An assembly robot positions parts with two rotary joints whose axes are parallel and vertical, then uses a vertical slide for insertion. Its characteristic compliance is in the horizontal plane, with stiffness in the vertical direction. Identify this robot configuration.
Correct answer: A - SCARA robot
A gripper may make up to three closing attempts. Each CLOSE_GRIPPER call updates GRIP_OK before execution continues; a successful grip must allow lifting, while three unsuccessful attempts must report failure. GRIP_OK starts FALSE. attempts = 0 WHILE (NOT GRIP_OK) AND (attempts < 3) CLOSE_GRIPPER attempts = attempts + 1 END WHILE IF attempts == 3 REPORT_GRIP_FAILURE ELSE LIFT_PART END IF A grip succeeds on the third attempt, but this program reports failure. Which revision fixes the final decision while preserving the three-attempt limit?
Correct answer: C - Test NOT GRIP_OK in the final IF.
On a dispensing robot, the nozzle reaches both ends of a straight seam correctly. Between those taught positions, a joint-interpolated move carries it away from the seam. Tool orientation is identical at both ends, and the straight route has been checked for reachability and clearance. What change directly corrects the nozzle's path?
Correct answer: C - Use linear interpolation of the tool center point between the endpoints.
After a successful cycle, a robot reports READY = 1, BUSY = 0, and FAULT = 0. All safety permissives are satisfied. Its interface accepts a start only when START changes from 0 to 1 while READY = 1. The PLC has left START = 1 since the previous cycle. To initiate the next cycle, the PLC should:
Correct answer: B - Lower START, then raise it while READY remains 1.
An axis fault log shows a following-error alarm each time the joint passes through the same narrow angular region. Authorized low-speed joint jogging reproduces the fault with no workpiece attached. Motor current rises sharply in that region, encoder feedback remains continuous, and the correct payload data are loaded. Where should the technician focus the inspection?
Correct answer: D - Mechanical binding or interference in the axis drive train.
A robot is commanded to return to X = 250.00 mm from the same approach direction. In 30 trials, its measured X positions range from 250.77 to 250.83 mm, with a mean of 250.80 mm. The application requires X = 250.00 ± 0.20 mm. Which interpretation fits these results?
Correct answer: C - The returns are closely repeatable, but their position accuracy is inadequate.
A longer dispensing nozzle has just been installed. With the nozzle vertical, the operator teaches a reference point and can return to it repeatedly. When commanded to change orientation while holding that tool center point (TCP) position fixed, the physical nozzle tip traces an arc instead of pivoting in place. The nozzle is rigidly mounted. Which setting should be checked first?
Correct answer: B - The active tool center point offset from the flange
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