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Electronic Principles

Electronic Principles
Most AC power is obtained from:

None of these
generators
lightning
batteries
oscillators

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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
Which one of the following statements regarding ac circuits is correct?

Current and voltages are in phase through a resistor
All of these
None of these
Current lags the voltage through a resistor
Current leads the voltage through a resistor

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Electronic Principles
A step-up transformer has a turns ratio of 1:4. If the line voltage is 115 V rms, what is the peak secondary voltage?

700 V
208 V
707 V
651 V
None of these

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

solar cell
piezoelectric device
photodiode
None of these
nicad cell

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Electronic Principles
When the Q point moves along the load line, the voltage increases when the current

Stays the same
Decreases
Increases
Can be any of above
None of these

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