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Electronic Principles

Electronic Principles
An audio transformer has a turn ratio of 9, What is its impedance ratio?

6
None of these
9
81
85

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Electronic Principles
Thevenin theorem replaces a complicated circuit facing a load by an

Ideal voltage source and parallel resistor
Ideal current source and series resistor
Ideal current source and parallel resistor
Ideal voltage source and series resistor
None of these

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Electronic Principles
When operating above its resonant frequency, a parallel RLC circuit has the characteristics of a:

parallel RLC circuit operated above its resonant frequency
parallel RC circuit
parallel RL circuit
None of these
purely resistive circuit

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Electronic Principles
The transistor has a collector current of 10 mA and a base current of 40 mA. What is the current gain of the transistor?

350 µA
None of these
250 µA
0.25 µA
300 µA

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Electronic Principles
Which one of the following devices is most often used for measuring opposition to current flow in a circuit?

Voltmeter
Wattmeter
Ammeter
Ohmmeter
None of these

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Electronic Principles
What is the turns ratio of a power transformer that shows 50 V at its secondary winding when you apply 150 V to its primary winding?

43922
3
None of these
43891
2

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