Substation Design MCQs (Part-1)

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

A To generate electricity
B To distribute electricity to homes
C To step up or step down voltage levels
D To store energy

Which component in a substation is used to interrupt current flow during a fault?

A Transformer
B Circuit breaker
C Isolator
D Relay

What is the role of a power transformer in a substation?

A To store electrical energy
B To control the flow of electricity
C To change voltage levels
D To prevent overcurrent

What is a busbar in a substation?

A A device to step up voltage
B A conductor to collect and distribute power
C A protection device
D A component for grounding

Which device protects a substation from lightning strikes?

A Circuit breaker
B Relay
C Lightning arrester
D Isolator

What is the main purpose of grounding in a substation?

A To reduce power losses
B To ensure operational continuity
C To provide a safe path for fault currents
D To increase voltage levels

Which device is used to isolate a section of the substation for maintenance?

A Circuit breaker
B Isolator
C Relay
D Transformer

What is the function of relays in a substation?

A To generate electricity
B To detect faults and trigger circuit breakers
C To control voltage levels
D To connect power lines

Which type of substation is used for high-voltage transmission?

A Compact substation
B Distribution substation
C Transmission substation
D Renewable energy substation

What does SCADA stand for in substations?

A Supervisory Control and Data Acquisition
B System Control and Device Automation
C Substation Control and Data Automation
D Supervisory Circuit and Data Access

What is the purpose of insulation coordination in substations?

A To improve current flow
B To select proper insulation levels for equipment
C To prevent equipment overheating
D To connect different circuits

What type of breaker is used in high-voltage substations?

A Oil circuit breaker
B Vacuum circuit breaker
C Air circuit breaker
D SF6 circuit breaker

Which substation equipment controls reactive power flow?

A Power transformer
B Shunt capacitor
C Relay
D Isolator

What is a compact substation?

A A substation with limited equipment
B A fully enclosed substation with compact design
C A renewable energy substation
D A mobile substation

What does a load dispatch center do?

A Repairs substation faults
B Manages power generation and distribution
C Designs substation layouts
D Installs substation equipment

What is the primary role of substation automation?

A To improve energy storage
B To enable remote monitoring and control
C To enhance fault isolation
D To increase voltage levels

Which device is used to manage voltage levels during peak loads?

A Tap changer
B Lightning arrester
C Circuit breaker
D Isolator

What is the function of a relay panel in a substation?

A To distribute power
B To detect faults and signal circuit breakers
C To step down voltage
D To connect transformers

Which test ensures the reliability of substation equipment?

A Load test
B Insulation resistance test
C Relay test
D All of the above

What is reactive power control important for in a substation?

A Preventing power loss
B Maintaining voltage stability
C Increasing current flow
D Enhancing insulation levels