Explanation

The resistance in an NTC (Negative Temperature Coefficient) Thermistor decreases with a rise in temperature.

This characteristic makes NTC thermistors useful for temperature sensing and control applications.

Explanation

The Reluctance Motor has an unsymmetrical rotor.

Its rotor has varying magnetic reluctance, which influences its operation and performance.

Explanation

Islamic law is unique due to its comprehensiveness of principles.

It cover various aspects of life, including ethics, personal conduct, and legal matters.

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

UJT (Uni-Junction Transistor) is also known as Double Base.

It has two bases and one emitter, distinguishing it from other transistors.

Explanation

In a delta connection of an induction motor, 5 slips are typically required.

These represent the number of distinct slip rings needed for the rotor winding connections.

Explanation

The Swinburne's Test is used for a no-load test on a DC motor.

It helps determine the motor's losses and efficiency under no-load conditions.

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

Accuracy is defined as the measure of how close an instrument's readings are to the true value.

It indicating how error-free it is.

Explanation

To solve this problem, we need to find the total current (I) drawn from the 220 V source.

First, let's find the current through one resistor:

I1 = V/R = 220 V / 68 ohms = 3.24 A (using Ohm's Law)

Since all resistors are identical and connected in parallel, the current through each resistor is the same:

I1 = I2 = I3 = I4 = 3.24 A

Now, we can find the total current (I) by adding the currents through each resistor:

I = I1 + I2 + I3 + I4 = 3.24 A + 3.24 A + 3.24 A + 3.24 A = 12.96 A ≈ 12.94 A

So, the correct answer is: 12.94 A