Explanation

A causal system depends on present and past input values.

It does not rely on future input values.

This making it practical for real-time processing.

Explanation

A galvanometer is used as a null detector in a Wheatstone bridge.

It detects the zero current condition, indicating that the bridge is balanced.

Explanation

The Hay Bridge is used for the measurement of inductance.

It is specifically designed to measure the inductance of coils with high accuracy.

Explanation

A lumped parameter circuit delay line is a low-pass filter.

It allows low-frequency signals to pass through while attenuating higher frequencies, effectively delaying the signal.

Explanation

An inductor stores energy in its magnetic field.

When current flows through the inductor, it generates a magnetic field around it, which stores energy.

Explanation

The output of an OR gate will be high when any of the inputs is high.

An OR gate outputs a high signal if at least one input is high.

Explanation

UJT (Uni-Junction Transistor) has negative resistance.

This characteristic allows it to be used in oscillators and timing circuits.

Explanation

• Component: Thermistor (specifically an NTC thermistor)
• Why: As temperature rises, more charge carriers become available in the semiconductor material
• Result: Resistance decreases with rising temperature
• Contrast: Most metals do the opposite — resistance increases with temperature (PTC behavior)

Explanation

A network containing one or more sources of EMF is known as an Active Network.

Active networks include elements like batteries or generators that provide energy to the circuit.

Explanation

UJT (Uni-Junction Transistor) is a low resistance diode when conducting.

It is used in triggering and timing circuits, featuring a low resistance between the emitter and base in its conducting state.