Unit 7: End Effectors and Sensors - Practice Quiz

1 What is the main purpose of an end effector on a robotic arm?

2 Which end effector is commonly used to hold objects by applying mechanical force?

3 What does a vacuum gripper use to pick up suitable objects?

4 Which end effector is best suited for picking up ferromagnetic metal parts?

5 What is the function of a welding torch used as an end effector?

6 What is a sensor in a robotic system?

7 Which sensor can detect whether an object is present without touching it?

8 What does a force sensor measure at the robot's end effector?

9 Which sensor is commonly used to identify objects by their visible appearance?

10 What does a limit switch indicate on a robotic arm?

11 Which sensor can help the Orangewood Robotic Arm detect contact with an object?

12 Why is an end effector selected according to the task?

13 Which end effector is designed to make holes in a workpiece?

14 What is the main use of a spray nozzle as a robotic end effector?

15 Which sensor detects the intensity of light near the robot?

16 What is the purpose of a color sensor in a robotic application?

17 What may happen if a gripper applies too little force?

18 What may happen if a gripper applies excessive force to a fragile object?

19 Where is an end effector normally mounted on the Orangewood Robotic Arm?

20 Why are sensors useful when operating a robotic arm?

21 An Orangewood robotic arm must pick up a smooth cylindrical metal rod without damaging it. Which end effector is most suitable?

22 Which end effector would be preferred for transferring flat, nonporous glass sheets with a robotic arm?

23 The robotic arm repeatedly drops a part because its parallel gripper closes by the same distance for every object. What is the most appropriate improvement?

24 A proximity sensor detects a component before the end effector reaches it. What is the main benefit of using this sensor?

25 The arm must identify whether a station contains a red or blue part before selecting a program. Which sensor is most appropriate?

26 During a pickup task, the gripper reaches the expected position but the part is not present. Which sensor can most directly verify successful contact with the part?

27 Why should a suction gripper not be selected for a rough, porous wooden block?

28 A magnetic end effector is being considered for sorting steel and plastic parts. Which limitation must be addressed?

29 Which sensor is most useful for measuring the distance between the robotic arm and an obstacle without physical contact?

30 An object has a fragile surface and varies slightly in width. Which gripper control strategy is most suitable?

31 A limit switch is installed near a gripper mechanism. What function does it commonly perform?

32 The Orangewood robotic arm places parts inaccurately because its joint angle readings are inconsistent. Which sensor should be inspected first?

33 A vacuum gripper successfully lifts a part, but the part falls during motion when the vacuum line develops a leak. Which sensor would help detect this condition?

34 For a task involving objects with unknown positions on a work surface, which sensor arrangement would provide the most useful information?

35 The arm must pick up a soft foam object whose shape changes during gripping. Which end effector is likely to distribute contact force most effectively?

36 When selecting an end effector for the Orangewood robotic arm, why must the payload rating be checked?

37 A tactile sensor on the gripper reports contact before the programmed closing distance is reached. What does this most likely indicate?

38 A reflective optical sensor gives false readings when strong sunlight enters the laboratory. Which action is most appropriate?

39 The robotic arm must sort aluminum parts from steel parts using magnetic response. What is the expected result?

40 Before using a new gripper on the Orangewood robotic arm, why is tool-center-point calibration required?

41 An Orangewood robotic arm must pick a smooth, nonporous glass disk whose surface is clean and whose mass is near the gripper limit. Which end effector is the most appropriate first choice?

42 A magnetic end effector successfully lifts a steel part but occasionally releases it during rapid horizontal motion. Which change most directly addresses the failure?

43 The arm uses a two-finger gripper to pick cylindrical parts of varying diameter. The gripper closes to a fixed encoder position, so some large parts are crushed and some small parts slip. Which control strategy is most robust?

44 A capacitive proximity sensor detects both a plastic object and a nearby operator's hand. Which adjustment is most likely to improve object discrimination?

45 A diffuse photoelectric sensor gives inconsistent readings when detecting black and white parts at the same station. Which modification best reduces dependence on surface reflectivity?

46 An ultrasonic sensor is mounted near the Orangewood arm and reports a shorter distance when the arm moves quickly toward a flat target. What is the most plausible cause?

47 The arm must insert a peg into a hole with small positional error but uncertain orientation. Which end-effector feature is most valuable for preventing jamming?

48 A vacuum gripper fails only when lifting porous cardboard. The vacuum pump and valve operate correctly. Which diagnosis is most consistent with the observation?

49 A limit switch is used to confirm that a gripper has reached its open position. The switch signal chatters near the contact point. Which implementation is most appropriate?

50 A load cell beneath a fixture measures a gripping force of before pickup and after pickup. If the gripper applies , what is the approximate payload mass, assuming the force increase is due only to the payload and ?

51 A force sensor is mounted at the wrist, but its zero reading changes after the gripper is replaced. What should be done before comparing force values across tools?

52 A color sensor classifies parts correctly under one lamp but incorrectly after the lamp is replaced. Which design change best improves classification reliability?

53 A reflective infrared sensor detects a shiny metal part even when the part is outside the intended pickup point. Which mechanical change most directly reduces this false trigger?

54 A gripper confirms contact using motor current. Current rises when the fingers touch an object, but it also rises during rapid acceleration. Which improvement best separates contact from motion effects?

55 The arm uses a proximity sensor to start a pick sequence. A target can remain in front of the sensor for several control cycles, causing repeated starts. Which logic prevents duplicate triggering?

56 A magnetic sensor is selected to detect whether a steel workpiece is present, but it also responds to a steel fixture behind the pickup location. Which solution is most appropriate?

57 A parallel gripper holds a rectangular part securely at low speed but drops it during a fast vertical lift. Which change provides the greatest safety margin without changing the part?

58 A force-sensitive end effector reports the same contact force for two objects, although one object is much stiffer. Which additional measurement would best distinguish their mechanical behavior?

59 A tactile sensor indicates successful grasping, but the object falls after the arm rotates 90 degrees. Which additional verification is most useful?

60 Two sensors are used to verify a part before pickup: a photoelectric sensor and a mechanical limit switch. The photoelectric sensor reports presence, but the switch does not actuate. What is the safest interpretation?