Chapter 7 Flashcards
(23 cards)
Define solid-state switch.
Electronic switching device that opens and closes circuits at a precise point in time to control current flow and voltage levels.
How is heat produced in solid-state switches?
Heat is produced as current passes through a solid state switch by the friction of the electrons with the devices solid state material.
What is a resistor?
an electrical device that limits current flowing in an electronic circuit
What are the two types of capacitors?
Fixed or variable
Why is half-wave rectification inefficient for most applications?
Because one half of the input sine wave is not used.
What are the three terminals of a silicon-controlled rectifier (SCR).
anode, cathode, gate
What are the three basic designs of transistors used in electric motor drives?
Bipolar junction transistor, field effect transistor, insulated-gate bipolar transistor
Define integrated power module.
Grouping of separate parts, such as IGBT’s
Define electrostatic discharge (ESD)
Movement of static electricity (electricity at rest) from the surface of one object to another object.
T/F - A heat sink is a device that conducts heat away from an electrical component
True
T/F - The type of enclosure used does not affect the temperature of an electric motor drive.
False
T/F - A semiconductor device is an electronic device that has electrical conductivity between that of a conductor and that of an insulator.
True
T/F - A rectifier changes DC voltage into AC voltage.
False (Cant change DC to AC)
T/F - The three terminals of a silicon-controlled rectifier are the anode, cathode, and emitter.
False
T/F - Transistors have no moving parts and can switch ON and OFF quickly
True
T/F - The two general categories of logic integrated circuits are the transistor-transistor logic family and metal-oxide-semiconductor family.
True
T/F - Static electricity cannot be discharged by human skin contact.
False
T/F - To control AC voltages, at least two transistors are used per phase.
True
T/F - Since the angle (timing) of the gate firing pulse can be changed, an SCR can vary voltage output.
True
T/F - A fixed resistor is a resistor that contains fixed tap points of different resistances.
False
T/F - Reverse bias is the condition of a diode when it does not allow current flow and acts as an insulator.
True
T/F - The saturation region is the maximum current that can flow in the transistor load circuit.
True
T/F - A fly-back diode is a diode placed across a transistor to prevent high voltage spikes produced by the collapsing magnetic field of the motor windings.
True
