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Electronic Principles

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

85
None of these
81
6
9

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Electronic Principles
The basic unit of measurement for current is the:

watt
None of these
ampere
ohm
volt

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Electronic Principles
Doubling the operating voltage of a purely capacitive circuit:

cuts the capacitive reactance in half
multiplies the capacitive reactance by 7
None of these
has no effect on the capacitive reactance
doubles the amount of capacitive reactance

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Electronic Principles
Suppose the peak value of a sinusoidal voltage is 50 V. What is the rms value?

None of these
38.74 V
35.4 V
37.4 V
30.4 V

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Electronic Principles
The transistor has a collector current of 2 mA. If the current gain is 135, what is the base current?

10.3 µA
14.8 µA
None of these
7.8 µA
7.75 µA

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Electronic Principles
Doubling the number of turns of wire in an inductor:

reduces the value of inductance by one-fourth
reduces the value of inductance by one-half
None of these
multiplies the value of inductance by two
multiplies the value of inductance by four

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