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

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

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Electronic Principles
Which one of the following statements is true for the voltage in a parallel RL circuit?

The total voltages is less than the sum of the voltages across the resistance and inductance
The voltage always has the same amplitude and phase for every part of the circuit
None of these
The total voltage lags the total current by less than 90
The total voltage is equal to the sum of the voltages across the resistance and inductance

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Electronic Principles
What is the difference between a conductor and an insulator?

An insulator allows current to flow much easier than a conductor does
The difference between conductors and insulators depends on how they are used
A conductor allows current to flow much easier than an insulator does
None of these
An insulator has an excessive number of free electrons, while a conductor has a few free electrons or none at all

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