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Electronic Principles

Electronic Principles
What is the capacitive reactance of a 0.1 micro F capacitor that is operating at 1000 Hz?

less than 1 Ohm
312 Ohm
None of these
690 Ohm
1590 Ohm

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Electronic Principles
Suppose a step-down transformer has a turns ration of 5:1. If the secondary current is 1A rms, what is the primary-current?

0.6 A
0.2 A
None of these
0.3 A
0.4 A

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Electronic Principles
The secondary voltage for a certain power transformer is twice the voltage applied to the primary. The current flowing in the secondary winding will be:

Same as the primary current
One-half the primary current
No more than 10% less than the primary current
Twice the primary current
None of these

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Electronic Principles
Absolute Zero temperature equals

-276o C
25o C
-273o C
0o C
None of these

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Electronic Principles
How much current flows through a 0.02 micro F capacitor that is operating from a 12-V ac, 100-Hz source?

0.995 mA
0.151 mA
157 raA
2.02 A
None of these

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

solar cell
thermocouple
None of these
photo transistor
photodiode

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