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Electronic Principles

Electronic Principles
Positive ions are atoms that have

Gained an electron
Lost a proton
Gained a proton
Lost an electron
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?

0.25 µA
250 µA
300 µA
None of these
350 µA

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Electronic Principles
Which one of the following equations most directly leads to the resistance of an ordinary household light bulb, assuming that you know the power and voltage rating?

P = PR
P = E2/R
None of these
R = E2/P
I = P/E

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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?

0.3 A
0.6 A
0.4 A
None of these
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 a capacitor that has a reactance of 100 ohm?

None of these
60 Ohm
250 Ohm
99.3 Ohm
70.7Ohm

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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
One-half the primary current
None of these
Same as the primary current

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