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Electronic Principles

Electronic Principles
A transistor has a current gain of 125 and a base current of 30 µA. What is the collector current?

3.75 mA
None of these
3.2 mA
13 mA
0.05 mA

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Electronic Principles
A diode is in series with 220W. If the voltage across the resister is 4V, what is the current through the diode?

None of these
16.3 mA
55.86 A
18.2 mA
55 A

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Electronic Principles
In a step-down transformer, which is larger?

Neither
Impossible to say
None of these
Secondary voltage
Primary voltage

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Electronic Principles
Doubling the operating voltage of a purely capacitive circuit:

None of these
has no effect on the capacitive reactance
cuts the capacitive reactance in half
multiplies the capacitive reactance by 7
doubles the amount of capacitive reactance

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

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

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Electronic Principles
Household light bulbs have a given power rating, and they operate at 120 V. Which one of the following equations most directly provides the current rating of these light bulbs?

P = IE
P = I2R
I = P/E
None of these
P = E2/R

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