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Electronic Principles

Electronic Principles
A device that converts light energy to electrical energy is called a:

photodiode
None of these
photo transistor
thermocouple
solar cell

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Electronic Principles
Which one of the following statements regarding ac circuits is correct?

None of these
Current leads the voltage through a resistor
All of these
Current and voltages are in phase through a resistor
Current lags the voltage through a resistor

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Electronic Principles
A battery is a device composed of one or more:

voltage generators
chemical cells
solar cells
None of these
piezoeletric cells

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Electronic Principles
The total impedance of a series RLC circuit:

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

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Electronic Principles
If the current gain is 200 and the collector current is 100 mA, the base current is

None of these
0.083333333333333
200 A
0.5 mA
2 mA

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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?

None of these
7.8 mA
200 mA
300 mA
208 mA

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