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Electronic Principles

Electronic Principles
Who invented the first junction transistor?

Gomes
Smith
Shockley
None of these
Fisher

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Electronic Principles
An intrinsic semiconductor has some holes in it at room temperature. What causes these holes?

Doping
Thermal energy
Free electrons
Valence electrons
None of these

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

170 V
120 V
100 V
180 V
None of these

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Electronic Principles
Suppose a step-down transformer has a turns ration of 5:1. If the secondary current is 1A rms, what is the primary-current?

None of these
0.3 A
0.6 A
0.2 A
0.4 A

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Electronic Principles
A zener regulator has an input voltage from 15 to 20 V and a load current from 5 to 20 mA. If the zener voltage is 6.8 V, what value should the series resistor have?

550 Ohm
400 Ohm
None of these
410 Ohm
310 Ohm

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Electronic Principles
What kind of device is a diode?

Linear
Unipolar
None of these
Bilateral
Nonlinear

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