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Electronic Principles

Electronic Principles
Suppose the voltage from a power outlet is 120 Vrms. What is the peak voltage?

180 V
None of these
120 V
100 V
170 V

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Electronic Principles
A real voltage source has

None of these
A small internal resistance
Infinite internal resistance
A large internal resistance
Zero internal resistance

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Electronic Principles
At room temperature an intrinsic silicon crystal acts approximately like

an insulator
a conductor
None of these
a piece of copper wire
a battery

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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?

None of these
18 V
12 V
30 V
24 V

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Electronic Principles
1 Microfarad is the same as:

1 million picofarads
1 millionth of a picofarad
1 million farads
None of these
1000 millifarads

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Electronic Principles
Suppose the zener diode has a breakdown voltage of 10 V and zener resistance of 8.5 W, what is the additional voltage when the current is 20 mA?

20 V
None of these
10.17 V
0.17 V
18.8 V

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