AMS 380 UNIT 1 EXAM QUESTIONS
AND ANSWERS ALL CORRECT
What happens to the conductivity of photoconductive material when light shines on it -
Answer- it increases
What is the photoconductive effect - Answer- the increased conductivity of an
illuminated semiconductor junction
What does the photoconductive effect in crystalline solids produce a noticeable change
in - Answer- the resistance of the solid
How might two similar SCRs be connected to safely distribute the power load of a circuit
- Answer- in parallel, reverse polarity
What are the three terminals of an SCR - Answer- anode, cathode, gate
Which of the following devices acts as two SCRs connected back to back, but facing in
opposite directions and sharing a common gate - Answer- TRIAC
What is the transistor called that is fabricated as two complementary SCRs in parallel
with a common gate terminal - Answer- TRIAC
What are the three terminals of a TRIAC - Answer- Gate, anode 1, and anode 2.
What circuit might contain a SCR - Answer- a light-dimming circuit
What is one common use for PIN diodes - Answer- RF switch
What is a common use of a hot-carrier diode - Answer- VHF and UHF mixers and
detectors
Structurally, what are two main categories of semiconductor diodes - Answer- junction
and point contact
What special type of diode is capable of both amplification and oscillation - Answer-
tunnel diodes
, The product of the readings of an AC voltmeter and AC ammeter is called - Answer-
apparent power
what is the basic unit of electrical power - Answer- watt
what is the term used to express the amount of electrical energy stored in an
electrostatic field - Answer- joules
what device is used to store electrical energy in an electrostatic field - Answer- capacitor
what formula would determine the inductive reactance of a coil if frequency and coil
inductance are known - Answer- XL = 2(pi)fL
what is the term for the out-of-phase power associated with inductors and capacitors -
Answer- reactive power
what determines the strength of the magnetic field around a conductor - Answer- the
amount of current
what will produce a magnetic field - Answer- a current flowing through a conductor
when induced currents produce expanding magnetic fields around conductors in a
direction that opposes the original magnetic field, this is known as - Answer- Lenz's law
the opposition to the creation of magnetic lines of force in a magnetic circuit is known as
- Answer- reluctance
what is meant by the term "back EMF" - Answer- a voltage that opposes the applied
EMF
permeability is defined as - Answer- the ratio of magnetic flux density in a substance to
the magnetizing force that produces it
What formula would calculate the total inductance of inductors in series - Answer- Lt =
L1 + L2
good conductors with minimum resistance have what type of electrons - Answer- many
free electrons
which of the 4 groups of metals listed below are the best low-resistance conductors -
Answer- gold, silver, and copper
what is the purpose of a bypass capacitor - Answer- it removes alternating current by
providing a low impedance path to ground
AND ANSWERS ALL CORRECT
What happens to the conductivity of photoconductive material when light shines on it -
Answer- it increases
What is the photoconductive effect - Answer- the increased conductivity of an
illuminated semiconductor junction
What does the photoconductive effect in crystalline solids produce a noticeable change
in - Answer- the resistance of the solid
How might two similar SCRs be connected to safely distribute the power load of a circuit
- Answer- in parallel, reverse polarity
What are the three terminals of an SCR - Answer- anode, cathode, gate
Which of the following devices acts as two SCRs connected back to back, but facing in
opposite directions and sharing a common gate - Answer- TRIAC
What is the transistor called that is fabricated as two complementary SCRs in parallel
with a common gate terminal - Answer- TRIAC
What are the three terminals of a TRIAC - Answer- Gate, anode 1, and anode 2.
What circuit might contain a SCR - Answer- a light-dimming circuit
What is one common use for PIN diodes - Answer- RF switch
What is a common use of a hot-carrier diode - Answer- VHF and UHF mixers and
detectors
Structurally, what are two main categories of semiconductor diodes - Answer- junction
and point contact
What special type of diode is capable of both amplification and oscillation - Answer-
tunnel diodes
, The product of the readings of an AC voltmeter and AC ammeter is called - Answer-
apparent power
what is the basic unit of electrical power - Answer- watt
what is the term used to express the amount of electrical energy stored in an
electrostatic field - Answer- joules
what device is used to store electrical energy in an electrostatic field - Answer- capacitor
what formula would determine the inductive reactance of a coil if frequency and coil
inductance are known - Answer- XL = 2(pi)fL
what is the term for the out-of-phase power associated with inductors and capacitors -
Answer- reactive power
what determines the strength of the magnetic field around a conductor - Answer- the
amount of current
what will produce a magnetic field - Answer- a current flowing through a conductor
when induced currents produce expanding magnetic fields around conductors in a
direction that opposes the original magnetic field, this is known as - Answer- Lenz's law
the opposition to the creation of magnetic lines of force in a magnetic circuit is known as
- Answer- reluctance
what is meant by the term "back EMF" - Answer- a voltage that opposes the applied
EMF
permeability is defined as - Answer- the ratio of magnetic flux density in a substance to
the magnetizing force that produces it
What formula would calculate the total inductance of inductors in series - Answer- Lt =
L1 + L2
good conductors with minimum resistance have what type of electrons - Answer- many
free electrons
which of the 4 groups of metals listed below are the best low-resistance conductors -
Answer- gold, silver, and copper
what is the purpose of a bypass capacitor - Answer- it removes alternating current by
providing a low impedance path to ground
