205-220

What is the main difference between a PNP and NPN BJT?

• The maximum current they can handle

• The materials used in their construction

• The polarity required for operation

• The shape of the physical layers

How does a field-effect transistor (FET) differ from a BJT in its operation?

• FETs cannot amplify electrical signals

• FETs require a much higher voltage to operate

• FETs use electric fields instead of charge carrier injection

• FETs only come in P-channel varieties.

How does the polarity of the gate voltage affect a JFET?

• A negative voltage always turns the JFET off.

• The polarity has no effect on the JFET's operation.

• A positive voltage always turns the JFET on

• The required polarity depends on the JFET type (P or N-channel)

What is the main difference between an enhancement-mode MOSFET and a depletion-mode MOSFET?

• A.      Enhancement-mode requires a higher voltage to turn on.

• Enhancement-mode is normally off, depletionmode is normally on.

• Enhancement-mode uses a different gate material

• A.      Depletion-mode has a wider conductive channel.

What is the key characteristic of a thyristor that distinguishes it from a transistor?

• Thyristors require a higher operating temperature

• Thyristors can latch into an "on" state

• Thyristors cannot handle high currents.

• Thyristors are only made in P-type varieties.

What is the main difference between an SCR and a TRIAC?

• TRIACs operate at a higher frequency

• SCRs are used for lower power applications

• TRIACs require a more complex triggering signal

• SCRs can only conduct current in one direction.

Which law states that a voltage is induced in a coil of wire by a varying magnetic field?

• Lenz's Law of Electromagnetic Induction

• Ampere's Law of Electromagnetic Induction

• Ohm's Law of Electromagnetic Induction

• Faraday's Law of Electromagnetic Induction

. What is the path followed by energy in a transformer?

• Source -> magnetic field only-> resistor

• Source -> magnetic field -> secondary coil -> resistor

• Source -> primary coil only-> resistor

• Source -> resistor only-> resistor

What is the name for the transformer component that experiences a changing magnetic field?

• Primary winding

• Secondary winding

• Core

• Load

Which term describes the transfer of electrical energy to magnetic energy and back again?

• Power transfer

• Energy conversion

• Magnetic coupling

• Voltage regulation