Question

In sensors, the response time is the time required:

• A. to measure accuracy
• B. to measure difference between measured and actual values
• C. to respond completely to change in input
• D. to respond to difference in values between two successive measurements

Hint:

Lower response time means faster sensor—important in dynamic systems.

Answer 1

The Correct Option is C

Concept: Response time is a dynamic characteristic of a sensor, indicating how quickly it reacts to changes.

Step 1: Define response time clearly.
It is the time required for the sensor output to reach a specified percentage (usually 90–95%) of final value after a sudden input change.

Step 2: Understand dynamic behavior.
When input changes:
• Sensor does not respond instantly
• Output gradually approaches final value

Step 3: Importance.

• Faster response → better performance
• Critical in control systems and automation

Step 4: Analyze options.

• (1) relates to accuracy → incorrect
• (2) relates to error → incorrect
• (3) correct definition
• (4) irrelevant Final Answer: \[ \boxed{\text{Time required to respond completely to change in input}} \]