Module 3 Electrical Fundamentals Latest Update

Module 3 Electrical Fundamentals Latest Update 2024-2025 Actual Exam Questions and 100% Verified Correct Answers Guaranteed A+

Questions and Answers

• 1.

A material in which there are no free charge carriers is known as

• A.

Conductor

• B.

Insulator

• C.

Charges Correct Answer

• Insulator

Explanation An insulator is a material in which there are no free charge carriers. 1 / 4

Unlike conductors, which have free electrons that can move easily within the material, insulators have tightly bound electrons that are not able to move freely. This lack of free charge carriers makes insulators poor conductors of electricity.

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4

• 2.

Conventional flow is:

• A.

Always from negative to positive

• B.

In the same direction as electron movement

• C.

In the opposite direction to electron movement Correct Answer

• In the opposite direction to electron movement

Explanation Conventional flow refers to the direction of current flow in a circuit, which is opposite to the actual movement of electrons. In reality, electrons flow from the negative terminal to the positive terminal of a battery or power source. However, conventional flow is defined as the opposite direction, from positive to negative. This convention was established before the discovery of the electron, and it simplifies circuit analysis and calculations. Therefore, the correct answer is "in the opposite direction to electron movement."

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• 3.

The power factor in an AC circuit is the same as:

• 2 / 4

The sine of the phase angle

• B.

The cosine of the phase angle

• C.

The tangent of a phase angle Correct Answer

• The cosine of the phase angle

Explanation The power factor in an AC circuit is the same as the cosine of the phase angle. This is because the power factor represents the ratio of the real power to the apparent power in the circuit. The real power is the component of power that performs useful work, while the apparent power is the product of the voltage and current magnitudes. The phase angle represents the phase difference between the voltage and current waveforms in the circuit. The cosine of the phase angle is used to calculate the power factor, as it relates the real power to the apparent power.

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• 4.

A passenger cabin has 110 passenger reading lamps each rated at 10W 28V. What is the maximum load current imposed by these lamps?

• A.

25.5 A

• B.

39.3 A

• 3 / 4

308 A Correct Answer

B. 39.3 A

Explanation The maximum load current imposed by the lamps can be calculated by dividing the total power consumed by the lamps by the voltage supplied.In this case, the total power consumed by the lamps is 110 lamps * 10W = 1100W. Since the lamps are rated at 28V, the maximum load current can be calculated as 1100W / 28V = 39.3A.

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• 5.

Two isolated charges have dissimilar polarities. The force

between them will be:

• A.

A force of attraction

• B.

A force of repulsion

• C.

Zero Correct Answer

• A force of attraction

Explanation Two isolated charges with dissimilar polarities will experience a force of attraction. This is because opposite charges attract each other according to the principle of electrostatics. The charges will exert an attractive force on each other, causing them to move towards each other.

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• 6.

• / 4