Electrical Grid Situational-Based MCQs- Advanced to Expert

A sudden disconnection of a large generator from the grid results in:

• Frequency increase

• Frequency drop and underfrequency protection activation

• Voltage overshoot

• Synchronization

In an interconnected grid, a tie-line helps:

• Store power

• Transfer power between regions and maintain frequency balance

• Lower frequency

• Protect SCADA

In case of fault current exceeding the rating of a circuit breaker, what system is added?

• Relay

• Current transformer

• Backup breaker or series reactor

• Fuse

What is the key parameter monitored by an Automatic Generation Control (AGC)?

• Power factor

• Frequency deviation and tie-line power

• Line voltage

• Breaker status

In real-time grid operations, Area Control Error (ACE) refers to:

• Energy difference

• Difference in scheduled and actual power flow and frequency

• Power loss

• Voltage error

A wind turbine generator connected to the grid must synchronize:

• Only voltage

• Voltage, frequency, and phase angle

• Just current

• Temperature

A large-scale solar PV plant output is fluctuating due to cloud cover. How does the grid handle this?

• Disconnect PV

• Use spinning reserves or battery storage

• Increase fault level

• Bypass transformer

Frequency relays in the grid are used to:

• Control voltage

• Shed load during underfrequency to avoid blackout

• Detect overcurrent

• Maintain PF

What is load frequency control responsible for?

• Voltage control

• Managing real power balance and system frequency

• Reactive power sharing

• Ground fault detection

What type of compensation is applied to long transmission lines to prevent voltage drop?

• Series capacitive compensation

• Shunt inductance

• Line reactor

• Open circuit