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Electronic Principles

Electronic Principles
Suppose the voltage from a power outlet is 120 Vrms. What is the peak voltage?

None of these
170 V
120 V
100 V
180 V

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Electronic Principles
A step-down transformer has turns ration of 5:1. If the primary voltage is 120 Vrms, what is the secondary voltage?

24 V
30 V
18 V
None of these
12 V

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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
0.4 A
0.6 A
None of these
0.2 A

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Electronic Principles
At room temperature an intrinsic semiconductor has

No holes
None of these
many holes
a few free electrons and holes
many free electrons

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Electronic Principles
Inductive reactance is measured in units of:

henrys
volts per second
Ohm
amperes per second
None of these

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Electronic Principles
The merging of a free electron and a hole is called

None of these
Lifetime
Recombination
Covalent bonding
Thermal energy

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