True or false

Question

An LDR is a device of which the resistance increases when it is exposed to light
Capacitive transducers can only operate from a DC supply
Lvdt cannot be used for the measurement of pressure

Answer 1

Let's evaluate each statement:

1. An LDR is a device of which the resistance increases when it is exposed to light: False

   • An LDR (Light Dependent Resistor) is a device whose resistance decreases when it is exposed to light. Therefore, the statement is false.

2. Capacitive transducers can only operate from a DC supply: False

   • Capacitive transducers can operate with both AC and DC supplies. The method of operation might differ depending on whether it's AC or DC, but they are not limited to just DC supply.

3. LVDT cannot be used for the measurement of pressure: True

   • An LVDT (Linear Variable Differential Transformer) is typically used for the measurement of displacement, not pressure. Therefore, it cannot be directly used for pressure measurement, making this statement true.

In summary:

1. False
2. False
3. True