Protection Systems, Waveforms and Signals

What is the main purpose of protection systems?

• To save energy
• To isolate faulty circuits
• To improve signal quality
• To reduce cost

How do distance relays operate?

• By sensing temperature
• By monitoring sound
• By comparing voltages
• By measuring distance

What does an inverse time overcurrent relay do?

• It operates slower at higher currents
• It operates faster at lower currents
• It operates faster at higher currents
• It operates at a constant speed

What can cause a lightning strike?

• High humidity
• Low wind speed
• High air resistance
• Air losing its insulating property

What is a sine wave?

• A type of digital signal
• A constant voltage
• A waveform with one frequency
• A triangular waveform

What type of signal can an analogue signal represent?

• Binary data
• Voltage spikes
• Temperature
• Digital codes

What is a digital signal typically represented by?

• Continuous values
• Two voltage values
• Multiple frequencies
• Single frequency

What is a logic gate used for?

• Converting AC to DC
• Storing data
• Processing inputs
• Amplifying signals

In digital logic design, what do the terms fan-in and fan-out refer to?

• The number of transistors used in a logic gate and the number of gates connected to a power source.

• The number of logic inputs a gate can handle and the number of logic outputs it can drive.

• The speed of signal propagation through a gate and the delay caused by multiple inputs.

• The amount of power consumed by a logic gate and the maximum number of gates on a circuit board.