1. Which of the following is the main objective of a power distribution
system?
A. Generation of electrical energy
B. Transmission of electrical energy
C. Distribution of electrical energy
D. Storage of electrical energy
Answer: c) Distribution of electrical energy
Rationale: A power distribution system is designed to deliver electrical
energy from the transmission network to consumers efficiently and
safely.
2. What is the primary function of a distribution transformer?
A. Step-up the voltage
B. Step-down the voltage
C. Protect the distribution lines
,D. Measure the voltage
Answer: b) Step-down the voltage
Rationale: A distribution transformer is used to reduce the high voltage
from the transmission lines to a lower voltage suitable for consumer
use.
3. Which of the following components is primarily used for protection
against overloads in a distribution system?
A. Transformer
B. Circuit breaker
C. Busbar
D. Insulator
Answer: b) Circuit breaker
Rationale: Circuit breakers are designed to automatically disconnect
the electrical circuit in case of overload or short-circuit conditions to
protect the system.
,4. The term 'load factor' refers to which of the following?
A. Ratio of maximum load to average load
B. Ratio of average load to maximum load
C. Ratio of total energy consumed to maximum load
D. Ratio of maximum energy to average energy consumed
Answer: b) Ratio of average load to maximum load
Rationale: Load factor is a measure of how efficiently electrical power is
used. It is the ratio of average load to the maximum demand during a
specific period.
5. Which type of cable is most commonly used in underground
distribution systems?
A. Aerial bundled cables (ABC)
B. Single-core PVC cables
C. Armored cables
D. Aluminum conductor steel-reinforced (ACSR) cables
Answer: c) Armored cables
, Rationale: Armored cables are used for underground distribution
systems because they provide mechanical protection against physical
damage.
6. Which of the following is used to control the flow of electric power
in a distribution system?
A. Circuit breakers
B. Distribution panels
C. Voltage regulators
D. All of the above
Answer: d) All of the above
Rationale: Circuit breakers, distribution panels, and voltage regulators
all play a role in controlling and maintaining the flow of electric power
in a distribution system.
7. What is the main purpose of a busbar in a distribution system?
A. Step-up voltage
system?
A. Generation of electrical energy
B. Transmission of electrical energy
C. Distribution of electrical energy
D. Storage of electrical energy
Answer: c) Distribution of electrical energy
Rationale: A power distribution system is designed to deliver electrical
energy from the transmission network to consumers efficiently and
safely.
2. What is the primary function of a distribution transformer?
A. Step-up the voltage
B. Step-down the voltage
C. Protect the distribution lines
,D. Measure the voltage
Answer: b) Step-down the voltage
Rationale: A distribution transformer is used to reduce the high voltage
from the transmission lines to a lower voltage suitable for consumer
use.
3. Which of the following components is primarily used for protection
against overloads in a distribution system?
A. Transformer
B. Circuit breaker
C. Busbar
D. Insulator
Answer: b) Circuit breaker
Rationale: Circuit breakers are designed to automatically disconnect
the electrical circuit in case of overload or short-circuit conditions to
protect the system.
,4. The term 'load factor' refers to which of the following?
A. Ratio of maximum load to average load
B. Ratio of average load to maximum load
C. Ratio of total energy consumed to maximum load
D. Ratio of maximum energy to average energy consumed
Answer: b) Ratio of average load to maximum load
Rationale: Load factor is a measure of how efficiently electrical power is
used. It is the ratio of average load to the maximum demand during a
specific period.
5. Which type of cable is most commonly used in underground
distribution systems?
A. Aerial bundled cables (ABC)
B. Single-core PVC cables
C. Armored cables
D. Aluminum conductor steel-reinforced (ACSR) cables
Answer: c) Armored cables
, Rationale: Armored cables are used for underground distribution
systems because they provide mechanical protection against physical
damage.
6. Which of the following is used to control the flow of electric power
in a distribution system?
A. Circuit breakers
B. Distribution panels
C. Voltage regulators
D. All of the above
Answer: d) All of the above
Rationale: Circuit breakers, distribution panels, and voltage regulators
all play a role in controlling and maintaining the flow of electric power
in a distribution system.
7. What is the main purpose of a busbar in a distribution system?
A. Step-up voltage
