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Electronic Principles

Electronic Principles
What is the barrier potential of a silicon diode at room temperature?

0.7V
1 V
None of these
0.3V
2 m V per degree Celsius

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Electronic Principles
In a step-down transformer, which is larger?

Primary voltage
Secondary voltage
Neither
Impossible to say
None of these

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Electronic Principles
A certain power transformer has a turns ratio of 5. What voltage can you expect at the secondary winding when you apply 120 V to the primary winding?

None of these
4.73
24 V
0.4 V
600 V

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Electronic Principles
What is the impedance of a circuit composed of a 100 ohm resistor connected in parallel with an inductor that has a reactance of 200 W?

77.7 ohm
89.3 ohm
88.8 ohm
None of these
224 ohm

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Electronic Principles
How much current flows through a 60-W light bulb that is operating at 120 V?

None of these
180 A
0.083333333333333
7200 A
0.5A

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Electronic Principles
A loadstone is:

a natural magnet
a temporary magnet
None of these
an artificial magnet
a paramagnetic alloy

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