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Electronic Principles

Electronic Principles
What is the turns ratio of a power transformer that shows 50 V at its secondary winding when you apply 150 V to its primary winding?

3
2
43922
43891
None of these

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Electronic Principles
Silicon atoms combine into an orderly pattern called a

Valence orbit
Covalent bond
Semiconductor
Crystal
None of these

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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:

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

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Electronic Principles
The transistor has a collector current of 10 mA and a base current of 40 mA. What is the current gain of the transistor?

350 µA
300 µA
0.25 µA
250 µA
None of these

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

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

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Electronic Principles
The rotating coil of wire in an electric motor is called the:

None of these
armature
loop
brush
commutator

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