Distribution Systems: Master the Basics for Electrical Power Systems

Question 1

Which of the following is NOT a characteristic of a radial distribution system?

Accepted Answer

Low reliability

Answer

Single path for power flow

Answer

Low cost

Answer

Easy to maintain

Question 2

What is the purpose of a loop distribution system?

Accepted Answer

To improve reliability by providing multiple paths for power flow

Answer

To increase power flow capacity

Answer

To reduce voltage drop

Answer

To reduce power losses

Question 3

What is the function of a distribution transformer?

Accepted Answer

To step down voltage for distribution

Answer

To step up voltage for transmission

Answer

To provide isolation between circuits

Answer

To convert AC to DC power

Question 4

Which of the following tools is essential for testing continuity in a distribution system?

Accepted Answer

Multimeter

Answer

Megger

Answer

Clamp meter

Answer

Power analyzer

Question 5

Which of the following is a characteristic of a radial distribution system?

Accepted Answer

Single path from the source to the load

Answer

Multiple paths from the source to the load

Answer

Use of transformers to step up voltage

Answer

Employs isolation devices for fault isolation

Question 6

What is the primary purpose of voltage regulation in distribution systems?

Accepted Answer

Maintain voltage levels within acceptable limits

Answer

Reduce power losses

Answer

Improve power quality

Answer

Increase system efficiency

Question 7

Which type of transformer is typically used in distribution systems to reduce voltage from transmission to distribution levels?

Accepted Answer

Distribution transformer

Answer

Autotransformer

Answer

Power transformer

Answer

Isolation transformer

Question 8

What is the most common method of power factor correction in distribution systems?

Accepted Answer

Capacitor banks

Answer

Inductor banks

Answer

Synchronous condensers

Answer

Load shedding

Question 9

What is the primary purpose of sectionalizing switches in a distribution system?

Accepted Answer

Isolating faults to limit service interruptions

Answer

Transferring load to backup feeders during outages

Answer

Regulating voltage to maintain acceptable levels

Answer

Improving power quality by reducing harmonics and noise

Question 10

What is the primary function of a voltage stabilizer in a distribution system?

Accepted Answer

Regulate voltage within a narrow range to ensure consistent power supply

Answer

Improve power factor by controlling reactive power flow

Answer

Reduce harmonic distortion by filtering out unwanted frequencies

Answer

Protect against overvoltage by diverting excess voltage to ground

Question 11

In distribution transformers, what type of paper is primarily used as insulation for the windings?

Accepted Answer

Kraft paper

Answer

Fiberglass

Answer

Rubber

Answer

Plastic

Question 12

Which characteristic is unique to a radial distribution system?

Accepted Answer

All loads are connected to a single feeder, simplifying system design

Answer

Power flows in multiple directions, providing redundancy

Answer

It is inherently more reliable than a loop system due to its isolated nature

Answer

It requires less maintenance than a loop system due to its simpler structure

Question 13

What is the primary objective of voltage regulation in a distribution system?

Accepted Answer

Maintain a constant voltage at the customer's premises to ensure reliable equipment operation

Answer

Reduce power losses by optimizing voltage levels throughout the system

Answer

Improve power quality by minimizing voltage fluctuations and disturbances

Answer

Increase system reliability by preventing voltage-related outages

Question 14

What is the main purpose of a distribution transformer?

Accepted Answer

Step down voltage from distribution levels to customer premises, providing usable voltage for homes and businesses

Answer

Step up voltage from transmission lines to distribution levels, enabling power delivery over longer distances

Answer

Isolate different parts of the distribution system, preventing fault propagation

Answer

Regulate voltage on the distribution system, maintaining acceptable voltage levels for consumers

Question 15

What is the primary function of a voltage regulator in an electrical distribution system?

Accepted Answer

Maintaining consistent voltage at customer locations

Answer

Reducing power factor

Answer

Protecting against overloads

Answer

Isolating faults

Question 16

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

Accepted Answer

Modifying voltage levels

Answer

Isolating electrical circuits

Answer

Providing power factor correction

Answer

Protecting against short circuits

Question 17

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

Accepted Answer

Stepping down voltage to supply distribution feeders

Answer

Stepping up voltage from transmission lines

Answer

Improving power factor

Answer

Isolating electrical circuits

Question 18

What is the overarching goal of electrical power distribution?

Accepted Answer

Delivering electrical energy from power sources to consumers

Answer

Regulating voltage and frequency

Answer

Protecting electrical equipment

Answer

Enhancing power quality

Question 19

In distribution systems, which topology provides backup and increased reliability?

Accepted Answer

Loop system

Answer

Radial system

Answer

Grid system

Answer

Ring system

Question 20

In distribution systems, what is the primary purpose of voltage regulation?

Accepted Answer

Maintaining voltage levels within acceptable ranges

Answer

Reducing power dissipation

Answer

Enhancing power quality

Answer

Protecting electrical equipment

Question 21

Which device is utilized in distribution systems to modify voltage levels?

Accepted Answer

Transformers

Answer

Capacitors

Answer

Inductors

Answer

Surge arresters

Question 22

What is often the основная причина for power quality concerns in distribution systems?

Accepted Answer

Harmonics

Answer

Voltage variations

Answer

Electromagnetic interference (EMI)

Answer

Transients

Question 23

In distribution systems, what is the main function of a distribution transformer?

Accepted Answer

Stepping down voltage for distribution

Answer

Elevating voltage for transmission

Answer

Isolating different system components

Answer

Overcurrent protection

Question 24

Which type of fault in a distribution system is considered the most severe?

Accepted Answer

Three-phase fault

Answer

Single-line-to-ground fault

Answer

Line-to-line fault

Answer

Double-line-to-ground fault

Question 25

In a distribution system, which type employs a single route for power flow?

Accepted Answer

Radial system

Answer

Loop system

Answer

Grid system

Answer

Hybrid system

Question 26

What is the principal function of a distribution transformer?

Accepted Answer

Lowering voltage levels

Answer

Elevating voltage levels

Answer

Isolating circuits

Answer

Controlling power flow

Question 27

Which characteristic defines a loop distribution system?

Accepted Answer

Multiple pathways for power flow

Answer

Diminished reliability

Answer

Elevated voltage drop

Answer

Lower maintenance costs

Question 28

What is the primary purpose of a sectionalizing switch within a distribution system?

Accepted Answer

Isolating a portion of the system

Answer

Protecting against excessive currents

Answer

Regulating voltage

Answer

Transferring loads between feeders

Question 29

Which type of fault commonly occurs in distribution systems?

Accepted Answer

Short circuit

Answer

Overvoltage

Answer

Undervoltage

Answer

Open circuit

Question 30

Which component is utilized to protect distribution lines from lightning strikes?

Accepted Answer

Lightning arrester

Answer

Surge protector

Answer

Fuse

Answer

Circuit breaker

Question 31

What is the primary objective of voltage regulation in distribution systems?

Accepted Answer

To maintain consistent voltage levels at customer premises.

Answer

To improve transmission efficiency.

Answer

To reduce power losses in lines.

Question 32

Which of the following is a common cause of power quality problems in distribution systems?

Accepted Answer

Harmonics

Answer

High frequency

Answer

Low voltage

Question 33

What is the main purpose of voltage regulators in distribution systems?

Accepted Answer

To maintain voltage levels within acceptable limits

Answer

To enhance power quality

Answer

To reduce power losses

Question 34

What is the primary function of a distribution transformer?

Accepted Answer

To convert high voltage to low voltage

Answer

To protect against overloads

Answer

To regulate voltage levels

Answer

To isolate different parts of the system

Question 35

What is the primary factor that determines the size of a distribution transformer?

Accepted Answer

Load demand

Answer

Voltage level

Answer

Distance from substation

Answer

Type of distribution system

Question 36

Which of the following is **not** an advantage of a radial distribution system?

Accepted Answer

Increased reliability

Answer

Lower construction and maintenance costs

Answer

Faster fault isolation

Answer

Reduced power losses

Question 37

What is the **primary** purpose of a distribution transformer?

Accepted Answer

Step down voltage for local distribution

Answer

Controlling power flow

Answer

Step up voltage for transmission

Answer

Isolating circuits for safety

Question 38

Which type of distribution system provides **multiple** paths for current flow?

Accepted Answer

Loop system

Answer

Primary system

Answer

Radial system

Answer

Secondary system

Question 39

Which device is commonly used to measure power factor in distribution systems?

Accepted Answer

Power factor meter

Answer

Ammeter

Answer

Voltmeter

Answer

Wattmeter

Question 40

What is the **primary function** of a capacitor bank in a distribution system?

Accepted Answer

Power factor correction

Answer

Harmonic filtering

Answer

Fault isolation

Answer

Voltage regulation

Question 41

Which type of fault results in a high current flow between two phases with **no** connection to ground?

Accepted Answer

Phase-to-phase fault

Answer

Line-to-ground fault

Answer

Three-phase fault

Answer

Line-to-line-to-ground fault

Question 42

What is the **main** role of a distribution substation in the power system?

Accepted Answer

Stepping down voltage for local distribution

Answer

Protecting equipment from faults

Answer

Generating electricity

Answer

Transmitting electricity long distances

Question 43

In a radial distribution system, the power flows:

Accepted Answer

Only in one direction, from the substation to the loads

Answer

Through multiple paths, from the substation to the loads

Answer

In both directions, between the substation and the loads

Question 44

The primary purpose of a voltage regulator in a distribution system is to:

Accepted Answer

Maintain a constant voltage level at the load terminals

Answer

Reduce the voltage level to prevent overloads

Answer

Increase the voltage level to compensate for line losses

Question 45

Which type of transformer connection provides the highest voltage between phases?

Accepted Answer

Delta-delta

Answer

Delta-wye

Answer

Wye-delta

Answer

Wye-wye

Question 46

A distribution system is designed to minimize:

Accepted Answer

Power losses and voltage variations

Answer

Safety hazards

Answer

Environmental impact

Answer

Cost of construction and maintenance

Question 47

Which factor primarily affects the selection of conductor size in distribution lines?

Accepted Answer

Current carrying capacity

Answer

Length of the line

Answer

Insulation type

Answer

Voltage level

Question 48

Power quality in a distribution system refers to:

Accepted Answer

The characteristics of the electrical power that ensure proper operation of equipment

Answer

The amount of power delivered to the loads

Answer

The reliability of the system

Question 49

Which type of substation is typically used for voltage transformation in distribution systems?

Accepted Answer

Distribution substation

Answer

Switching substation

Answer

Transmission substation

Answer

Generating substation

Question 50

The main advantage of a loop distribution system over a radial system is:

Accepted Answer

Improved reliability by providing multiple paths for power flow

Answer

Lower power losses

Answer

Higher voltage levels