Electrical Protection Quiz

Which device is used to isolate a circuit during a fault by opening the contacts?

• Relay

• Current Transformer

• Circuit Breaker

• Fuse

• Capacitor

The Buchholz relay is primarily used to protect:

• Transmission Lines

• Transformers

• Generators

• Capacitor Banks

• Busbars

Which type of relay operates based on the impedance between the relay location and the fault?

• Overcurrent Relay

• Differential Relay

• Distance Relay

• Directional Relay

• Thermal Relay

A Phasor Measurement Unit (PMU) synchronizes measurements using:

• Local Oscillators

• GPS Satellites

• Fiber Optic Cables

• Radio Waves

• Capacitive Coupling

Which fault type involves all three phases and ground?

• Line-to-Line

• Single Line-to-Ground

• Three-Phase-to-Ground

• Double Line-to-Ground

• Open Circuit

The primary function of a Current Transformer (CT) is to:

• Measure Voltage

• Step Down Current

• Detect Frequency Variations

• Quench Arcs

• Store Energy

Which ANSI device number represents a directional overcurrent relay?

• 50

• 67

• 27

• 86

• 32

Magnetizing inrush current in transformers is caused by:

• Short Circuits

• Core Saturation

• Overloading

• Ground Faults

• Harmonic Distortion

A relay that operates when the measured impedance falls within a circular characteristic is:

• Reactance Relay

• Mho Relay

• Impedance Relay

• Quadrilateral Relay

• Differential Relay

Which fuse type is filled with carbon tetrachloride?

• Expulsion Fuse

• Cartridge Fuse

• Liquid-Type HV HRC Fuse

• Drop-Out Fuse

• Rewirable Fuse