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Electronic Principles

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
None of these
3.2 mA
0.05 mA
13 mA

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

Thermal energy
Valence electrons
None of these
Free electrons
Doping

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Electronic Principles
A battery is a device composed of one or more:

piezoeletric cells
chemical cells
None of these
voltage generators
solar cells

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Electronic Principles
A transformer has a primary voltage of 120 V rms and a secondary voltage of 25 V rms. If the secondary current is 1A rms, what is the primary current?

None of these
300 mA
200 mA
208 mA
7.8 mA

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Electronic Principles
Thevenin theorem replaces a complicated circuit facing a load by an

Ideal current source and series resistor
Ideal voltage source and parallel resistor
None of these
Ideal current source and parallel resistor
Ideal voltage source and series resistor

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Electronic Principles
The component that forms the electrical connection between the rotating coil of wire in a motor and the external source of electrical energy is called the:

commutator
rotor
battery
armature
None of these

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