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Electronic Principles

Electronic Principles
Silicon atoms combine into an orderly pattern called a

Semiconductor
None of these
Valence orbit
Crystal
Covalent bond

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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:

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

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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
208 mA
7.8 mA
300 mA
200 mA

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

ampere
watt
volt
ohm
None of these

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Electronic Principles
Doubling the diameter of the coil in an inductor:

reduces the value of inductance by one-fourth
multiplies the value of inductance by two
None of these
reduces the value of inductance by one-half
multiplies the value of inductance by four

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Electronic Principles
A zener regulator has an input voltage from 15 to 20 V and a load current from 5 to 20 mA. If the zener voltage is 6.8 V, what value should the series resistor have?

None of these
400 Ohm
410 Ohm
310 Ohm
550 Ohm

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