Question

Which of the following are External Sensors? A. Tachometer sensor
B. Ultrasonic sensors
C. Laser sensors
D. Vision sensors
E. Potentiometer sensors

• A. A, B and C only
• B. B, C and D only
• C. C, D and E only
• D. A, D and E only

Hint:

External sensors → environment sensing (vision, ultrasonic, laser).

Answer 1

The Correct Option is B

Concept: Sensors are classified as:
• Internal sensors → measure internal states (speed, position)
• External sensors → sense environment

Step 1: Evaluate tachometer (A).

• Measures rotational speed
• Internal system parameter Hence internal → false.

Step 2: Evaluate ultrasonic sensor (B).

• Measures distance from environment Hence external → true.

Step 3: Evaluate laser sensor (C).

• Used for scanning and detection External → true.

Step 4: Evaluate vision sensor (D).

• Captures images of environment External → true.

Step 5: Evaluate potentiometer (E).

• Measures position internally Internal → false.

Step 6: Final conclusion.
\[ B, C, D \] \[ \boxed{\text{Answer: B, C and D only}} \]