Robotics Technician Certification
Examination Questions And Correct
Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant
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Question 1
Which type of robot actuator is most commonly used in industrial applications for
its high torque-to-inertia ratio and precise position control without mechanical
braking?
A. Pneumatic cylinder
B. Hydraulic piston
C. Stepper motor
D. Brushless DC servo motor
Answer: D. Brushless DC servo motor. Brushless DC servo motors offer high
torque-to-inertia ratios, excellent speed regulation, and precise position control
through encoder feedback. They do not require mechanical brakes for holding
position under load because the motor's holding torque is electrically generated.
Pneumatic and hydraulic actuators require external braking or valving. Stepper
motors have lower torque-to-inertia ratios and can lose steps under load.
Question 2
What is the primary function of a harmonic drive in a robotic joint?
A. Increase rotational speed
B. Provide electrical isolation
,C. Reduce backlash and provide high reduction ratios
D. Measure joint torque directly
Answer: C. Reduce backlash and provide high reduction ratios. Harmonic drives
are strain-wave gearing systems that offer zero-backlash operation and high
reduction ratios (typically 30:1 to 320:1) in a compact package. They are widely
used in robot joints for precise positioning. They do not increase speed; they
reduce it. They do not provide electrical isolation or directly measure torque
(though torque can be inferred from strain).
Question 3
A robotic arm has a repeatability specification of ±0.02 mm. This means:
A. The robot can achieve any position within a 0.02 mm radius
B. The robot will return to a previously taught position within 0.02 mm under the
same conditions
C. The robot's accuracy is exactly 0.02 mm
D. The robot's resolution is 0.02 mm
Answer: B. The robot will return to a previously taught position within 0.02 mm
under the same conditions. Repeatability is the ability to return to a
programmed position, not accuracy (which relates to achieving a commanded
absolute position). Resolution is the smallest incremental motion. The 0.02 mm
radius describes the scatter of repeated attempts, not a guaranteed absolute
position.
Question 4
Which sensor type is preferred for collision detection in collaborative robots due
to its ability to measure force along multiple axes simultaneously?
A. Proximity inductive sensor
B. Capacitive tactile sensor
C. Six-axis force/torque sensor
D. Single-axis load cell
,Answer: C. Six-axis force/torque sensor. These sensors measure forces and
moments along all three Cartesian axes (Fx, Fy, Fz) and torques (Tx, Ty, Tz),
providing comprehensive data for collision detection and force control. Inductive
sensors detect metal presence only. Capacitive tactile sensors are surface-level.
Single-axis load cells lack multi-directional sensitivity.
Question 5
In a differential-drive mobile robot, if both wheels rotate forward at equal speed,
the robot will:
A. Rotate in place clockwise
B. Rotate in place counterclockwise
C. Move in a straight line forward
D. Curve to the left
Answer: C. Move in a straight line forward. Equal forward wheel speeds produce
linear motion along the robot's longitudinal axis. Differing speeds cause
curvature; opposite speeds cause rotation in place. The direction
(clockwise/counterclockwise) depends on wheel configuration and speed signs.
Question 6
What does the Denavit-Hartenberg (D-H) convention primarily provide for robotic
manipulators?
A. A method for inverse kinematics solving
B. A systematic way to assign coordinate frames and define link transformations
C. A trajectory planning algorithm
D. A dynamic model for torque calculation
Answer: B. A systematic way to assign coordinate frames and define link
transformations. The D-H convention uses four parameters (a, α, d, θ) to
describe each link's geometry and joint motion, enabling forward kinematics
computation. It does not directly solve inverse kinematics, plan trajectories, or
compute dynamics, though it is a prerequisite for those tasks.
, Question 7
Which of the following is a characteristic of a piezoelectric accelerometer used in
vibration monitoring of robot motors?
A. It requires an external power supply for operation
B. It generates its own electrical charge proportional to acceleration
C. It measures static acceleration down to DC
D. It is insensitive to temperature changes
Answer: B. It generates its own electrical charge proportional to acceleration.
Piezoelectric accelerometers are self-generating (charge output) and excel at
dynamic AC measurements but cannot measure static acceleration (DC). They
are temperature-sensitive and require charge amplifiers, not external power for
the sensing element itself.
Question 8
What is the purpose of a teach pendant in industrial robotics?
A. To permanently store robot programs
B. To manually guide the robot through desired positions and record waypoints
C. To control the robot's power supply
D. To perform real-time kinematic calculations
Answer: B. To manually guide the robot through desired positions and record
waypoints. Teach pendants are handheld devices used for programming (lead-
through or point-to-point teaching), jogging, and debugging. They do not serve
as permanent storage (that is the controller's memory), power control, or
kinematic calculation hardware.
Question 9
A robot's end-effector velocity in Cartesian space is related to joint velocities by
the:
A. Forward kinematics matrix
Examination Questions And Correct
Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant
Download Pdf
Question 1
Which type of robot actuator is most commonly used in industrial applications for
its high torque-to-inertia ratio and precise position control without mechanical
braking?
A. Pneumatic cylinder
B. Hydraulic piston
C. Stepper motor
D. Brushless DC servo motor
Answer: D. Brushless DC servo motor. Brushless DC servo motors offer high
torque-to-inertia ratios, excellent speed regulation, and precise position control
through encoder feedback. They do not require mechanical brakes for holding
position under load because the motor's holding torque is electrically generated.
Pneumatic and hydraulic actuators require external braking or valving. Stepper
motors have lower torque-to-inertia ratios and can lose steps under load.
Question 2
What is the primary function of a harmonic drive in a robotic joint?
A. Increase rotational speed
B. Provide electrical isolation
,C. Reduce backlash and provide high reduction ratios
D. Measure joint torque directly
Answer: C. Reduce backlash and provide high reduction ratios. Harmonic drives
are strain-wave gearing systems that offer zero-backlash operation and high
reduction ratios (typically 30:1 to 320:1) in a compact package. They are widely
used in robot joints for precise positioning. They do not increase speed; they
reduce it. They do not provide electrical isolation or directly measure torque
(though torque can be inferred from strain).
Question 3
A robotic arm has a repeatability specification of ±0.02 mm. This means:
A. The robot can achieve any position within a 0.02 mm radius
B. The robot will return to a previously taught position within 0.02 mm under the
same conditions
C. The robot's accuracy is exactly 0.02 mm
D. The robot's resolution is 0.02 mm
Answer: B. The robot will return to a previously taught position within 0.02 mm
under the same conditions. Repeatability is the ability to return to a
programmed position, not accuracy (which relates to achieving a commanded
absolute position). Resolution is the smallest incremental motion. The 0.02 mm
radius describes the scatter of repeated attempts, not a guaranteed absolute
position.
Question 4
Which sensor type is preferred for collision detection in collaborative robots due
to its ability to measure force along multiple axes simultaneously?
A. Proximity inductive sensor
B. Capacitive tactile sensor
C. Six-axis force/torque sensor
D. Single-axis load cell
,Answer: C. Six-axis force/torque sensor. These sensors measure forces and
moments along all three Cartesian axes (Fx, Fy, Fz) and torques (Tx, Ty, Tz),
providing comprehensive data for collision detection and force control. Inductive
sensors detect metal presence only. Capacitive tactile sensors are surface-level.
Single-axis load cells lack multi-directional sensitivity.
Question 5
In a differential-drive mobile robot, if both wheels rotate forward at equal speed,
the robot will:
A. Rotate in place clockwise
B. Rotate in place counterclockwise
C. Move in a straight line forward
D. Curve to the left
Answer: C. Move in a straight line forward. Equal forward wheel speeds produce
linear motion along the robot's longitudinal axis. Differing speeds cause
curvature; opposite speeds cause rotation in place. The direction
(clockwise/counterclockwise) depends on wheel configuration and speed signs.
Question 6
What does the Denavit-Hartenberg (D-H) convention primarily provide for robotic
manipulators?
A. A method for inverse kinematics solving
B. A systematic way to assign coordinate frames and define link transformations
C. A trajectory planning algorithm
D. A dynamic model for torque calculation
Answer: B. A systematic way to assign coordinate frames and define link
transformations. The D-H convention uses four parameters (a, α, d, θ) to
describe each link's geometry and joint motion, enabling forward kinematics
computation. It does not directly solve inverse kinematics, plan trajectories, or
compute dynamics, though it is a prerequisite for those tasks.
, Question 7
Which of the following is a characteristic of a piezoelectric accelerometer used in
vibration monitoring of robot motors?
A. It requires an external power supply for operation
B. It generates its own electrical charge proportional to acceleration
C. It measures static acceleration down to DC
D. It is insensitive to temperature changes
Answer: B. It generates its own electrical charge proportional to acceleration.
Piezoelectric accelerometers are self-generating (charge output) and excel at
dynamic AC measurements but cannot measure static acceleration (DC). They
are temperature-sensitive and require charge amplifiers, not external power for
the sensing element itself.
Question 8
What is the purpose of a teach pendant in industrial robotics?
A. To permanently store robot programs
B. To manually guide the robot through desired positions and record waypoints
C. To control the robot's power supply
D. To perform real-time kinematic calculations
Answer: B. To manually guide the robot through desired positions and record
waypoints. Teach pendants are handheld devices used for programming (lead-
through or point-to-point teaching), jogging, and debugging. They do not serve
as permanent storage (that is the controller's memory), power control, or
kinematic calculation hardware.
Question 9
A robot's end-effector velocity in Cartesian space is related to joint velocities by
the:
A. Forward kinematics matrix
