Transmission and Distribution Systems MCQs (Part-14)

What is the main purpose of a distribution transformer?

A To step up voltage for long-distance transmission
B To step down voltage for local distribution
C To increase power factor
D To regulate frequency

What is the typical range of low-voltage distribution systems?

A 0–1 kV
B 1–33 kV
C 33–110 kV
D Above 110 kV

What is the main advantage of overhead lines over underground cables?

A Higher current carrying capacity
B Lower installation and maintenance cost
C Better insulation
D Higher efficiency

Why are conductors stranded in power systems?

A To improve power factor
B To increase mechanical strength and flexibility
C To reduce inductance
D To increase capacitance

What is the purpose of a substation in a power system?

A To store energy for peak demand
B To regulate voltage and control power flow
C To generate electricity
D To increase conductor size

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

A To reduce power factor
B To supply reactive power and improve power factor
C To store energy
D To regulate system frequency

What is the typical voltage range for high-voltage transmission lines?

A 1–33 kV
B 33–110 kV
C 110–765 kV
D Above 765 kV

What is the purpose of line impedance in a transmission system?

A To reduce voltage levels
B To oppose the flow of current and affect power transfer
C To reduce current flow
D To regulate voltage levels

What is the primary function of a relay in a power system?

A To step up voltage
B To detect faults and trigger a circuit breaker
C To improve power factor
D To regulate system frequency

What does reactive power in a power system do?

A Increases active power
B Supports voltage levels and stabilizes the system
C Reduces system losses
D Reduces line impedance

What is the function of a voltage regulator in a power system?

A To maintain a constant voltage level despite variations in load
B To increase system efficiency
C To balance load across phases
D To decrease transmission losses

What is the primary cause of line losses in power systems?

A Line resistance
B High voltage transmission
C Line capacitance
D Load balancing

What is the main purpose of load balancing in a power system?

A To distribute electrical load evenly across all phases
B To reduce voltage fluctuations
C To reduce system resistance
D To increase power factor

What is the function of a lightning arrester in a power system?

A To protect the system from overvoltage due to lightning strikes
B To step down voltage
C To regulate power factor
D To reduce system impedance

What is the primary role of a relay in a protection system?

A To detect abnormal conditions and trigger protection devices
B To store energy for future use
C To regulate voltage levels
D To increase power factor

What is the primary advantage of integrating renewable energy into power grids?

A Reduced environmental impact and sustainable energy supply
B Increased system losses
C Higher installation cost
D Reduced power quality

What is the primary function of a smart meter in a distribution network?

A To monitor and record energy usage in real-time
B To regulate voltage levels
C To store energy
D To balance load across phases

What is the function of a microgrid in modern power systems?

A To operate independently or in conjunction with the main grid for localized power supply
B To step up voltage levels
C To store renewable energy for future use
D To balance load across regions

What is the main cause of power loss in overhead transmission lines?

A Conductor capacitance
B Line resistance
C Overhead line tension
D Voltage regulation

What is the purpose of voltage regulation in a power system?

A To maintain a constant voltage at the load despite variations in load or generation
B To reduce line impedance
C To increase current flow
D To balance reactive power