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Electronic Principles

Electronic Principles
The rotating coil of wire in an electric motor is called the:

armature
loop
commutator
None of these
brush

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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?

7.75 µA
14.8 µA
7.8 µA
None of these
10.3 µA

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Electronic Principles
Doubling the operating frequency of a capacitive circuit:

None of these
has no effect on the capacitive reactance
doubles the amount of a capacitive reactance
multiplies the capacitive reactance by 6.28
cuts the capacitive reactance in half

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Electronic Principles
Holes are the minority carriers in which type of semiconductor?

n-type
Extrinsic
None of these
p-type
Intrinsic

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Electronic Principles
The basic unit of measurement for resistance is the:

volt
watt
ohm
None of these
ampere

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Electronic Principles
A step-down transformer has turns ration of 5:1. If the primary voltage is 120 Vrms, what is the secondary voltage?

12 V
None of these
18 V
24 V
30 V

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