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Electronic Principles

Electronic Principles
An audio transformer has a turn ratio of 9, What is its impedance ratio?

81
85
9
None of these
6

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Electronic Principles
Assuming 100% efficiency, what is the power being consumed at the secondary winding of the transformer described in question 91?

None of these
1000 W
20 W
200 W
100 W

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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?

12 V
30 V
18 V
24 V
None of these

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

0.955 A
0.02 A
2.02 A
None of these
0.41666666666667

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Electronic Principles
The transistor has a current gain of 175. If the base current is 0.1 mA, what is the collector current?

1750 mA
175 mA
1.75 mA
17.5 mA
None of these

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Electronic Principles
The total impedance of a series RLC circuit:

is minimum at the resonant frequency
None of these
is maximum at the resonant frequency
always increases as the applied frequency increases
always decreases as the applied frequency increases

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