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Electronic Principles

Electronic Principles
Which one of the following devices is most often used for measuring electrical potential difference?

None of these
Wattmeter
Voltmeter
Ammeter
Ohmmeter

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

ohm
None of these
volt
ampere
watt

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Electronic Principles
The primary impedance of a transformer is 60 ohm and the secondary impedance is 120 ohm. What is the impedance ratio?

0.25
4
0.5
180
None of these

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Electronic Principles
What is the barrier potential of a silicon diode at room temperature?

2 m V per degree Celsius
0.7V
None of these
1 V
0.3V

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Electronic Principles
A circuit has two different voltage sources that are connected in a series-aiding form. If the sources are rated at 6 V and 9 V, what is the total source voltage?

None of these
16 V
8 V
15 V
7.5 V

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Electronic Principles
Assuming 100% efficiency, what is the power being consumed at the secondary winding of the transformer described in question 91?

100 W
200 W
None of these
1000 W
20 W

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