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Electronic Principles

Electronic Principles
A device that converts mechanical into electrical energy is?

thermocouple
solar cell
generator
chemical cell
None of these

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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?

None of these
700 V
208 V
707 V
651 V

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Electronic Principles
An intrinsic semiconductor has some holes in it at room temperature. What causes these holes?

Free electrons
Valence electrons
Thermal energy
None of these
Doping

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Electronic Principles
A transformer has a primary voltage of 120 V rms and a secondary voltage of 25 V rms. If the secondary current is 1A rms, what is the primary current?

None of these
7.8 mA
208 mA
300 mA
200 mA

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

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

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Electronic Principles
If a load resistance is 1 kW, a stiff current source has a resistance of

At least 10 Ohm
Less than 100 k Ohm
None of these
Less than 10 Ohm
More than 100 k Ohm

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