EHV-AC Transmission Quiz

Why is EHV-AC transmission preferred for long distances?

• Reduces transmission losses

• Increases transmission losses

• Reduces voltage levels

• Requires more conductors

What is the primary reason for using high voltage in power transmission?

• To reduce current and minimize power losses

• To increase current and power losses

• To use smaller conductors

• To increase the frequency

Which of the following is a major advantage of EHV-AC transmission?

• Better voltage regulation

• Increased line losses

• Higher short-circuit current

• Increased insulation cost

What is the typical voltage range of EHV-AC transmission?

• 220 kV and above

• Below 110 kV

• 50 kV – 100 kV

• Below 33 kV

What is one major disadvantage of EHV-AC transmission?

• Corona loss

• High power losses

• Low voltage stability

• High transmission resistance

What is the function of a transformer in an EHV substation?

• Steps up or steps down voltage

• Converts AC to DC

• Converts DC to AC

• Stores electrical energy

What is the role of a circuit breaker in an EHV substation?

• Interrupts fault currents

• Reduces voltage fluctuations

• Converts power factor

• Measures electrical power

Which device is used in EHV substations to protect against overvoltage?

• Surge arrester

• Load breaker

• Transformer

• Insulator

What is the function of current transformers (CTs) in substations?

• Measure current and provide isolation

• Step up voltage

• Convert AC to DC

• Improve power factor

Which of the following components is used for isolating electrical circuits?

• Isolator

• Transformer

• Circuit breaker

• Busbar