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Electronic Principles

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

9
None of these
85
81
6

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Electronic Principles
Current can flow through a normally open push button switch as long as:

its contact remain open
its contact remain open
you are not pressing the button
None of these
you are pressing the button

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Electronic Principles
If a load resistance is 1 kW, a stiff current source has a resistance of

Less than 10 Ohm
None of these
At least 10 Ohm
Less than 100 k Ohm
More than 100 k Ohm

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

thermocouple
None of these
solar cell
chemical cell
piezoelectric devices

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Electronic Principles
A step-down transformer has turns ration of 5:1. If the primary voltage is 120 Vrms, what is the secondary voltage?

18 V
24 V
30 V
12 V
None of these

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Electronic Principles
What is the algebraic sum of this series of values:+2, -3, -6,+4?

-6
None of these
-3
2

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