WorksheetsRobotic Arm and Trajectory Quiz
Total questions: 27
Worksheet time: 14mins
Which of the following statements best describes a robotic arm?
A collection of rigid links connected by joints
A device that can only move in a straight line
A mechanism that uses wheels instead of hinges
A closed kinematic chain specialized for drilling
Which of the following is not a primary component of a robotic arm?
Controller
End effector
Power supply (battery pack)
Drives
Which joint type in robotic arms allows linear (sliding) motion?
Revolute joint
Prismatic (linear) joint
Universal joint
Twisting joint
In industrial settings, the most common actuator type for robotic arm joints is:
Regular DC motors without feedback
Stepper motors (or servomotors)
Internal combustion engines
Liquid-fueled rocket thrusters
Which of the following best describes a Cartesian robot arm?
It is equipped with a spherical work envelope.
It moves linearly along the X, Y, and Z axes.
It has no prismatic joints.
It always features six degrees of freedom.
Collaborative robots (Cobots) are primarily designed for:
High payload, high-speed operations with no human presence
Completely autonomous work with no human supervision
Maintaining maximum safety while working side by side with humans
Only hobbyist use and cannot be used in factories
A SCARA robot arm is named for its “Selective Compliance…” which means:
It is designed to always move in 3D arcs
It has limited flexibility in certain directions
It only uses prismatic joints
It cannot handle repetitive tasks
Which of the following is true about a 6-axis articulated robot?
It can only move along one axis at a time.
It has exactly three revolute joints.
It can position its end-effector at any point in 3D space and orient it in any required angle (roll, pitch, yaw).
It cannot perform pick-and-place tasks.
Degrees of Freedom (DOF) in the context of robotic arms refers to:
The number of joints in the arm that can move independently
The overall mass of the robot
The type of programming language the robot uses
The maximum number of parts the arm can hold at once
Which statement best describes forward kinematics?
Determining the joint angles required to place the end effector at a desired location
Calculating the end effector’s location given known joint angles
Using feedback controllers to keep the robot’s movement stable
Performing real-time vision tracking with the robot’s camera
Inverse kinematics is often more complex than forward kinematics primarily because:
There is always only one solution
It is impossible to compute on a standard computer
There can be multiple (or no) joint-angle solutions for a desired end-effector position
Robot arms usually lack enough data to perform calculations
In joint space, the position of the robot is described by:
The (x, y, z) coordinates of the end effector in Cartesian space
The orientation angles (roll, pitch, yaw) of the end effector
The specific angles (or displacements) at each joint of the robot
The speed of the conveyor belt next to the robot
When planning a trajectory for a robot, the “path” refers to:
Only the final location of the end effector
The route or shape the robot will follow in space
The velocity and acceleration profiles over time
The rotation of the gripper or end effector
When planning a trajectory for a robot, the “trajectory” (in contrast to “path”) also includes:
Only the shape of the path
A list of all obstacles in the workspace
The time parameterization (speed, acceleration) of motion along that path
A guarantee that the path cannot be changed
Why is smooth movement an important consideration in trajectory planning?
To minimize the programming time
Because jerky motions can cause inaccuracies or damage fragile objects
Because it is required by law in most countries
It makes no difference as long as the robot eventually reaches the goal
A “velocity profile” in trajectory planning is best described as:
The shape of the path in space, ignoring speed
The maximum payload the robot can carry
How the robot’s speed changes over the course of the movement
The difference between forward and inverse kinematics
Which of the following statements is true about polynomial trajectories?
They can never be used with articulated robot arms
They use polynomial equations to ensure smooth acceleration and velocity
They are always time-optimal
They are a type of trajectory that cannot be adapted to pick-and-place tasks
Splined trajectories differ from single polynomial trajectories because:
They consist of multiple smaller polynomial segments connected smoothly
They use only straight lines between key points
They are typically jerky and not smooth
They cannot handle more than two control points
In time-parameterized trajectories, the key added element is:
The mass of the end effector
The robot’s color scheme
Detailed control of how the motion progresses over time (e.g., acceleration, deceleration)
The difference between left-handed and right-handed coordinate systems
Which type of robot is most commonly seen performing tasks in an automotive assembly line (welding, painting, etc.)?
SCARA robot
Cartesian/Gantry robot
Articulated 6-axis robot
Delta robot
How can a human arm be thought of as an example of an open kinematic chain? Which of the following correctly identifies the “links” and “joints” of the human arm?
The upper arm, forearm, and hand are the "joints," and the shoulder, elbow, and wrist are the "links."
The upper arm, wrist, and hand are the "links," and the shoulder, elbow, and forearm are the "joints."
The shoulder, elbow, and wrist are the "links," and the upper arm, forearm, and hand are the "joints."
The shoulder, elbow, and wrist are the "joints," and the upper arm, forearm, and hand are the "links."
What is the role of controllers in a robotic arm system, and why are they sometimes referred to as the “brains” of the robot?
Controllers are responsible for moving the robot and making decisions based on external stimuli.
Controllers process information and send commands to actuators to achieve desired movement.
Controllers primarily serve as input devices for human users.
Controllers serve as the "eyes" of the robot.
What is meant by “degrees of freedom” in robotics, and why is having six degrees of freedom standard for industrial robotic arms?
Degrees of freedom refer to the number of sensors on the robot, and six is standard for accuracy.
Degrees of freedom describe the number of axes a robotic arm can move in, and six allows for maximum flexibility in movement.
Degrees of freedom refer to the number of robots in a system, and six robots are needed for proper functionality.
Degrees of freedom refer to the number of actuators in a robot, and six actuators are necessary for balance.
Which of the following best describes the difference between forward kinematics and inverse kinematics in robotics?
Forward kinematics calculates the position of the end-effector based on joint angles, while inverse kinematics calculates the joint angles needed to reach a desired position.
Forward kinematics uses geometric principles to determine joint angles, while inverse kinematics is used for robotic simulations.
Forward kinematics is used to plan a path, while inverse kinematics is used to correct errors in movement.
Forward kinematics is used for visualizing movements, while inverse kinematics is for managing robot sensors.
Why might there be multiple solutions in inverse kinematics for a single end-effector position?
Different joint angles can achieve the same end-effector position due to the robot's geometry.
The end-effector may actually make potential pathways simpler.
Only one solution exists for inverse kinematics; multiple solutions are never possible.
Multiple solutions occur only in robots with more than six degrees of freedom.
Why is smooth movement important in robotic applications? Which of the following is a task that requires precise velocity and acceleration control?
Simple material handling in a factory.
Painting or welding tasks, where uniform motion is crucial for quality.
Moving a robotic arm to a fixed position with no concern for time.
Testing the endurance of a robotic arm under extreme conditions.
Which trajectory type would be preferred for an application requiring precise control over acceleration and velocity?
Straight-line trajectory
Circular trajectory
Polynomial trajectory
None of the above
