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Electronic Principles

Electronic Principles
The barrier potential accross each depletion layer is

0.7 V
20 V
None of these
0.8 V

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Electronic Principles
A transistor has a current gain of 125 and a base current of 30 µA. What is the collector current?

None of these
0.05 mA
3.75 mA
3.2 mA
13 mA

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Electronic Principles
Doubling the diameter of the coil in an inductor:

None of these
reduces the value of inductance by one-fourth
multiplies the value of inductance by two
reduces the value of inductance by one-half
multiplies the value of inductance by four

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Electronic Principles
What is the turns ratio of a power transformer that shows 50 V at its secondary winding when you apply 150 V to its primary winding?

43891
2
None of these
3
43922

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Electronic Principles
A transistor has a current gain of 125 and a base current of 30 µA. What is the collector current?

3.75 mA
13 mA
3.2 mA
0.05 mA
None of these

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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?

410 Ohm
None of these
550 Ohm
310 Ohm
400 Ohm

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