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Electronic Principles

Electronic Principles
The equivalent of 1 micro A is:

one million amperes
1000 A
one-millionth of an ampere
None of these
10000A

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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?

24 V
12 V
30 V
None of these
18 V

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Electronic Principles
In a step-down transformer, which is larger?

Neither
None of these
Primary voltage
Secondary voltage
Impossible to say

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Electronic Principles
Current and voltage are said to be in phase when:

their waveforms are both ac or both dc
None of these
All of these
their waveforms cross through zero and reach positive and negative peaks at the same time
they have the same amplitude and frequency

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

None of these
piezoeletric cells
chemical cells
solar cells
voltage generators

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Electronic Principles
What is the smallest number of polarities required for current flow?

Two - a negative terminal and a positive terminal
One - a negative terminal
Three - negative, positive and neutral terminals
Four - two negative and two positive
None of these

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