Transmission and Distribution Systems MCQs (Part-2)

What is the typical voltage range for medium voltage systems?

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

Which type of insulator is commonly used for low-voltage distribution lines?

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

What is the purpose of a line trap in a power transmission system?

A To improve power factor
B To filter out high-frequency communication signals
C To protect the system from overvoltage
D To regulate voltage

What type of fault occurs when a conductor comes into contact with the ground?

A Line-to-line fault
B Double line-to-ground fault
C Line-to-ground fault
D Three-phase fault

What is the term for the distance between a conductor and the supporting structure?

A Clearance
B Span
C Sag
D Tension

What is the primary function of a distribution transformer?

A To step up voltage
B To reduce transmission losses
C To step down voltage for end users
D To increase power factor

What is the unit of transmission line capacitance?

A Ohm
B Henry
C Farad
D Ampere

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

A Lower cost
B Better protection from environmental factors
C Higher power capacity
D Easier maintenance

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

A To increase voltage levels
B To evenly distribute electrical load across the system
C To reduce conductor size
D To eliminate reactive power

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

A 11-33 kV
B 33-110 kV
C 110-765 kV
D Above 765 kV

What is the purpose of using dampers on overhead transmission lines?

A To reduce sag
B To minimize wind-induced vibrations
C To increase conductivity
D To prevent corona discharge

Which type of relay is commonly used for overcurrent protection in distribution systems?

A Distance relay
B Overcurrent relay
C Differential relay
D Buchholz relay

What is the purpose of a ground wire in transmission lines?

A To carry load current
B To protect the system from lightning strikes
C To reduce sag
D To regulate voltage

What is the main factor affecting corona discharge?

A Conductor size
B Voltage level
C Air pressure
D Humidity

Which parameter increases in a transmission line when its length increases?

A Voltage
B Resistance
C Frequency
D Power factor

What is the purpose of using oil in transformers?

A To reduce magnetic losses
B To insulate and cool the transformer
C To increase efficiency
D To regulate voltage

What is the term for the vertical distance between an overhead conductor and the ground?

A Clearance
B Sag
C Tension
D Span

What is the main disadvantage of overhead lines compared to underground cables?

A Higher installation cost
B Vulnerability to environmental factors
C More difficult to maintain
D Higher transmission losses

Which type of fault occurs most frequently in power systems?

A Three-phase fault
B Line-to-line fault
C Line-to-ground fault
D Double line-to-ground fault

What is the main advantage of smart meters in distribution systems?

A Higher voltage levels
B Accurate energy measurement and monitoring
C Reduced transmission losses
D Increased load capacity