RME Review - Semiconductors

Which material is most commonly used in semiconductor components?

• silicon

• copper

• aluminum

• gold

How does a diode function in an electrical circuit?

• It allows current to flow in both directions

• It blocks current flow in all conditions

• It allows current to flow in one direction only

• It amplifies current

What type of semiconductor device is used to control high-power AC loads?

• Diode

• Thyristor (SCR)

• resistor

• transformer

In an electrical panel, where might you find semiconductors?

• circuit breakers

• contactors

• VFD

• grounding rods

Which semiconductor device is commonly used for rectification in power supplies?

• triac

• diodes

• transformer

• inductor

In a three-phase motor drive system, how are semiconductors used?

• They help in mechanical alignment

• They act as thermal insulators

• They regulate voltage and current through switching devices like IGBTs

• They increase the physical size of the motor

What is the purpose of a Zener diode ?

• To store energy

• To allow current to flow in both directions

• To provide surge protection

• To increase current flow

Why are IGBTs (Insulated Gate Bipolar Transistors) used in VFDs?

• They provide efficient, high-speed switching for AC motor control

• They generate resistance in circuits

• They increase the weight of the motor

• They prevent current from flowing

How many valence electrons does semiconductors have?

• 4

• 8

• 2

• 0

What happens when a semiconductor junction is forward biased?

• It blocks current flow

• It allows current to flow

• It amplifies voltage

• It stores charge