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Electronic Principles

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

None of these
6
81
9
85

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Electronic Principles
Absolute Zero temperature equals

25o C
-276o C
None of these
-273o C
0o C

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Electronic Principles
The primary impedance of a transformer is 60 ohm and the secondary impedance is 120 ohm. What is the impedance ratio?

4
0.5
0.25
180
None of these

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

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

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Electronic Principles
A circuit has two different voltage sources that are connected in a series-aiding form. If the sources are rated at 6 V and 9 V, what is the total source voltage?

16 V
8 V
15 V
None of these
7.5 V

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Electronic Principles
What is the smallest number of polarities required for current flow?

Three - negative, positive and neutral terminals
Two - a negative terminal and a positive terminal
Four - two negative and two positive
None of these
One - a negative terminal

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