Transmission and Distribution Systems MCQs (Part-7)

What is the primary role of a transmission system in a power network?

A To generate power
B To distribute power locally
C To transmit power over long distances
D To step down voltage levels

Which property of a conductor minimizes power loss in a transmission line?

A High resistance
B High conductivity
C High tensile strength
D High weight

What type of transformer is installed in substations for voltage regulation?

A Step-up transformer
B Step-down transformer
C Tap-changing transformer
D Auto-transformer

What is the purpose of neutral grounding in a power system?

A To step up voltage
B To improve power factor
C To provide a path for fault currents
D To reduce current

What is the significance of power factor in a power system?

A It indicates the frequency stability
B It measures the efficiency of power usage
C It determines the voltage regulation
D It calculates the current capacity

Which component is responsible for protecting a power system from short circuits?

A Capacitor
B Circuit breaker
C Transformer
D Lightning arrester

What is the main advantage of high-voltage transmission?

A Higher conductor resistance
B Reduced transmission losses
C Increased power factor
D Lower system frequency

Which type of insulator is commonly used in distribution systems with sharp bends or terminations?

A Suspension insulator
B Strain insulator
C Pin insulator
D Shackle insulator

What is the purpose of a substation transformer?

A To step up or step down voltage levels
B To generate electrical power
C To store energy
D To increase system frequency

What is reactive power used for in a power system?

A To perform useful work
B To establish magnetic fields in inductive loads
C To reduce power losses
D To increase active power

What is the function of a voltage regulator in a distribution network?

A To increase current flow
B To maintain constant voltage levels
C To step up voltage
D To protect against short circuits

Which type of conductor arrangement reduces skin effect?

A Solid conductor
B Stranded conductor
C Twisted pair
D Coaxial cable

What is the typical frequency of AC power in most countries?

A 30 Hz
B 50 Hz
C 75 Hz
D 90 Hz

What is the purpose of earthing in a substation?

A To increase voltage levels
B To provide a path for fault currents
C To reduce conductor resistance
D To increase system efficiency

What is the primary advantage of using high-voltage transmission for long distances?

A Higher conductor resistance
B Reduced transmission losses
C Increased power factor
D Lower system frequency

Which type of insulator is commonly used in distribution systems with sharp bends or terminations?

A Suspension insulator
B Strain insulator
C Pin insulator
D Shackle insulator

What is the purpose of a substation transformer?

A To step up or step down voltage levels
B To generate electrical power
C To store energy
D To increase system frequency

What is reactive power used for in a power system?

A To perform useful work
B To establish magnetic fields in inductive loads
C To reduce power losses
D To increase active power

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

A To reduce voltage levels
B To improve power factor by providing reactive power
C To increase current flow
D To reduce insulation requirements

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

A Lower cost
B Better protection from environmental factors
C Higher current-carrying capacity
D Easier maintenance