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Electrical Distribution and Transformer Fundamentals Quiz

#1

Which of the following materials is commonly used as an insulator in electrical distribution?

Rubber
Explanation

Rubber is commonly used due to its high resistance to electricity.

#2

What is the function of a transformer in an electrical distribution system?

To increase voltage
Explanation

Transformers are used to step up or step down voltage levels efficiently.

#3

What is the purpose of a fuse in an electrical circuit?

To prevent overcurrent
Explanation

Fuses protect circuits by interrupting the flow of current when it exceeds safe levels.

#4

Which of the following is a characteristic of an alternating current (AC) system?

Voltage and current vary periodically
Explanation

AC systems alternate direction periodically, resulting in varying voltage and current.

#5

Which type of transformer is commonly used to step up or step down voltage in electrical distribution?

Step-down transformer
Explanation

Step-down transformers reduce voltage levels for distribution.

#6

What is the main function of a distribution system in electrical engineering?

To distribute electrical power to end-users
Explanation

Distribution systems transmit electricity from power plants to consumers.

#7

Which of the following is a unit of electrical power?

Watt
Explanation

Watt is the standard unit of measurement for electrical power.

#8

What is the term for the phenomenon where a sudden rush of current flows into an electrical system after a disruption?

Power surge
Explanation

A power surge is a sudden increase in voltage that can damage equipment.

#9

What is the primary function of a circuit breaker?

To interrupt the flow of current in case of overload
Explanation

Circuit breakers protect circuits by stopping the flow of electricity when there's a fault.

#10

Which of the following is a component of a distribution transformer?

Core
Explanation

The core provides a path for magnetic flux in a transformer.

#11

Which type of electrical distribution system uses a single-phase AC supply?

Split-phase system
Explanation

Split-phase systems use a single-phase AC supply to distribute power.

#12

What is the purpose of the core in a transformer?

To provide a path for magnetic flux
Explanation

The core directs magnetic flux between the transformer's windings.

#13

In a three-phase electrical system, what is the phase difference between each phase?

120 degrees
Explanation

Each phase is 120 degrees out of phase with the other two in a balanced system.

#14

What is the unit of measurement for electrical resistance?

Ohm
Explanation

Ohm is the standard unit of electrical resistance.

#15

What is the effect of adding more windings to the primary coil of a transformer?

Increase in voltage
Explanation

More windings on the primary coil lead to a higher voltage output.

#16

What is the efficiency of an ideal transformer?

100%
Explanation

An ideal transformer is perfectly efficient, transferring all power without losses.

#17

What is the phenomenon where a material allows the flow of electrical current with little resistance called?

Conduction
Explanation

Conduction is the movement of electrical charge through a material with minimal resistance.

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