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Electronic Principles

Electronic Principles
The rotating coil of wire in an electric motor is called the:

loop
None of these
commutator
brush
armature

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Electronic Principles
The total impedance of a series RLC circuit:

always increases as the applied frequency increases
is maximum at the resonant frequency
None of these
always decreases as the applied frequency increases
is minimum at the resonant frequency

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Electronic Principles
A transistor has how many doped regions?

1
4
2
3
None of these

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Electronic Principles
A transformer has a primary voltage of 120 V rms and a secondary voltage of 25 V rms. If the secondary current is 1A rms, what is the primary current?

200 mA
208 mA
300 mA
None of these
7.8 mA

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Electronic Principles
Doubling the operating frequency of a capacitive circuit:

cuts the capacitive reactance in half
multiplies the capacitive reactance by 6.28
has no effect on the capacitive reactance
doubles the amount of a capacitive reactance
None of these

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Electronic Principles
A diode is in series with 220W. If the voltage across the resister is 4V, what is the current through the diode?

55 A
16.3 mA
55.86 A
18.2 mA
None of these

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