motor control 2-2
The diac has two terminals identified as ? and ? .
A1 / A2
A ? has three leads identified as base, collector, and emitter.
BJT
The ? is controlled by current.
BJT
The ? is controlled by voltage.
FET
The triac is a half-wave device.
False
When the gate pulse is removed from an SCR, the SCR will stop conducting.
False
A ? has three leads, identified as drain, source, and gate.
JFET
? are well-suited for switching operations.
JFETs
A(n) ? has three leads, identified as anode, cathode, and gate.
SCR
Electronic devices should be removed from the circuit before they are tested.
True
The SCR is a half-wave device.
True
The gate lead controls or triggers the SCR.
True
To test semiconductor devices, one must understand the cause and effect of forward-biasing a PN junction and reverse-biasing a PN junction.
True
Transistor circuits are identified by the terminal that is common to the input and the output.
True
Transistors are faster and more reliable than mechanical relays.
True
When a transistor operates as a linear amplifier, it is operating in the ? region.
active
The center material of a bipolar junction transistor is called a ? .
base
When a transistor operates as an open switch, it is in the ? region.
cutoff
When a transistor operates as a switch, it is in the ? region or ? region.
cutoff / saturation
Identify the transistor circuit configurations with the correct name.
emitter, collector, base
For a BJT to operate as an amplifier, the base-emitter junction must be ? biased and the base-collector junction must be ? biased.
forward / reverse
When testing a PNP transistor with an ohmmeter, what are the high or low resistance values expected for a good transistor?
high, low, high, low, hih, high
A PN junction should exhibit a ? resistance when it is forward biased, and a ? resistance when it is reverse biased.
low / high
When testing an NPN transistor with an ohmmeter, what are the high or low resistance values expected for a good transistor?
low, high, low, high, high, high
Field-testing semiconductor devices focuses on using a(n) ? to determine if PN junctions in the device are functioning properly.
ohmmeter
A diode that has a high resistance at both polarities is ? .
open
A(n) ? is used to provide a signal between two electrically isolated circuits.
optocoupler
A(n) ? conducts current as a function of light intensity.
phototransistor
The ? is a solid-state device that combines a photodiode and a transistor.
phototransistor
Identify the correct name of the transistor symbol.
pnp,npn
When a transistor operates as a closed switch, it is in the ? region.
saturation
A diode that has a low resistance at both polarities is ? .
shorted
Amplification and ? are the two main operating functions of the transistor.
switching
The ? has three leads, identified as gate, main terminal 1, and main terminal 2
triac
The diac acts like two ? diodes in series; therefore, it is primarily used as a triggering device for other semiconductors.
zener
