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Electronic Principles

Electronic Principles
How many protons does the nucleus of a silicon atom contain?

29
4
14
None of these
48

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Electronic Principles
Which one of the following kinds of materials has the lowest permeability?

A paramagnetic material
None of these
All of these
A feiTomagnetic material
A diamagnetic material

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Electronic Principles
The transistor has a collector current of 2 mA. If the current gain is 135, what is the base current?

10.3 µA
7.8 µA
7.75 µA
14.8 µA
None of these

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Electronic Principles
Which one of the following properties of a magnetic circuit can be directly compared to voltage in an electrical circuit?

Flux density
None of these
Magnetomotive force
Number of lines of force
Reluctance

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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
310 Ohm
410 Ohm

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Electronic Principles
A device that converts thermal energy to electrical energy is called a:

piezoelectric devices
None of these
thermocouple
solar cell
chemical cell

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