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Electronic Principles

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

armature
loop
commutator
None of these
brush

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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
Three - negative, positive and neutral terminals
One - a negative terminal
Two - a negative terminal and a positive terminal

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Electronic Principles
Suppose a step-down transformer has a turns ration of 5:1. If the secondary current is 1A rms, what is the primary-current?

0.6 A
0.4 A
None of these
0.3 A
0.2 A

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Electronic Principles
What is the impedance of a circuit composed of a 100 ohm resistor connected in parallel with an inductor that has a reactance of 200 W?

224 ohm
89.3 ohm
77.7 ohm
88.8 ohm
None of these

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Electronic Principles
Reducing the amount of current through an inductor:

has no effect on the inductance
reduces the value of inductance by one-half
multiplies the value of inductance by two
None of these
multiplies the value of inductance by four

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Electronic Principles
A battery is a device composed of one or more:

chemical cells
piezoeletric cells
None of these
solar cells
voltage generators

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