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Electronic Principles

Electronic Principles
A zener diode has a voltage of 10 V and a current of 20 mA. What is the power dissipation?

20 mW
300 mW
10 mW
200 mW
None of these

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Electronic Principles
What kind of battery is most likely included in a cordless electric knife?

None of these
Zinc-carbon battery
Nicad battery
Mercury-cell battery
Lead-acid battery

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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?

0.2 A
0.6 A
0.3 A
0.4 A
None of these

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Electronic Principles
How much current flows through a 0.02 micro F capacitor that is operating from a 12-V ac, 100-Hz source?

0.151 mA
2.02 A
0.995 mA
None of these
157 raA

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Electronic Principles
The component that forms the electrical connection between the rotating coil of wire in a motor and the external source of electrical energy is called the:

armature
None of these
rotor
commutator
battery

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Electronic Principles
The rise time of a pulse waveform is the time required for the voltage to rise:

from zero to its rms value
None of these
from zero to its peak value
from 10% of the peak value to 70.7% of the peak value
from 10% of the peak value to 90% of the peak value

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