Journeyman Electrician Exam Prep Study Guide: The Simplified Handbook with 12 Updated Full-Length Practice Test Questions to Pass your Exam with Confidence by Publishing Upgrade

Author:Publishing, Upgrade
Language: eng
Format: epub
Published: 2024-10-21T00:00:00+00:00

Explained answers to Quiz 2

1. C) 40℃

Transformers should not operate at temperatures exceeding 40℃ to prevent overheating and insulation damage.

2. C) Causes moisture saturation

High humidity can cause transformers or motors to absorb moisture, potentially affecting their performance and reliability.

3. C) 40% - 70%

The ideal humidity range for transformer operation is between 40% and 70%, which helps to avoid moisture saturation and maintain performance.

4. B) Overheating and damage

If the voltage exceeds 105% of the rated value, the transformer may overheat, leading to potential damage or failure.

5. C) Temperature

Among the conditions like voltage, current, and frequency, temperature is the most critical factor for transformer performance.

6. B) Generator

Generators are the most common sources of electrical power, especially for emergency or backup situations.

7. B) Watts

The output of a generator is measured in watts, which indicates its power generation capacity.

8. C) Relative motion between a magnetic field and a conductor.

This is the principle behind electromagnetic induction, which is how generators produce electricity.

9. B) Stator and rotor

In a generator, the stator is the stationary part, while the rotor is the moving part that creates a rotating magnetic field.

10. B) Induces a voltage in the stator.

The rotor moves within the magnetic field, inducing voltage in the stationary stator windings.

11. B) False

A generator converts mechanical energy into electrical energy, not the other way around.

12. D) Both A and C

DC generators cannot produce high voltages and have issues with noise and wear due to the brushes.

13. A) Faraday’s law of induction

Both AC and DC generators operate on Faraday's law, which states that a changing magnetic field induces an electric current in a conductor.

14. B) By using a commutator

A commutator in a DC generator is responsible for converting alternating current (AC) generated in the armature into direct current (DC).

15. B) Rotor and stator

The rotor and stator are the two main components of a DC generator, where the rotor rotates within the stator.

16. A) Higher efficiency

AC generators are more efficient than DC generators and are easier to regulate, making them more suitable for most applications.

17. B) Converts mechanical energy into electrical energy

The alternator in a generator converts mechanical energy (from an engine, turbine, etc.) into electrical energy.

18. A) The number of turns in the primary winding

The voltage induced in the primary winding of a transformer is proportional to the number of turns in the winding.

19. A) Alternating current

AC generators produce alternating current, which is characterized by the periodic reversal of direction in the flow of electricity.

20. B) False

Generators can produce both AC and DC power, depending on their design and use.

21. C) Direct current

A DC generator produces direct current (DC), which flows in one direction, unlike AC which alternates.

22. B) By the relative motion between a magnetic field and a conductor

This motion induces an electrical current, which is the basic working principle of generators.

23. A) AC generators produce alternating current, DC generators produce direct current

The fundamental difference between AC and DC generators lies in the type of current they produce: AC or DC.

24. B) High efficiency

AC generators are preferred due to their high efficiency and ability to power most modern electrical devices.

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