Electronic Principles – Section 3

46. An audio transformer has a turn ratio of 9, What is its impedance ratio?

A. 81
B. 85
C. 6
D. 9
E. None of the above

Correct Answer:  A. 81

47. Which one of the following statements is true?

A. The secondary voltage for a step-down power transformer is greater than the primary voltage
B. The secondary current for a step-down power transformer is greater than the primary voltage
C. Parallel RLC circuit operated below its resonant frequency
D. purely resistive circuit
E. None of the above

Correct Answer:  B. The secondary current for a step-down power transformer is greater than the primary voltage

48. How many protons does the nucleus of a silicon atom contain?

A. 4
B. 29
C. 14
D. 48
E. None of the above

Correct Answer:  C. 14

49. A circuit has two different voltage sources that are connected in a series-opposing form. If the sources are rated at 6 V and 9 V, what is the total source voltage?

A. 3 V
B. 16 V
C. 7.5 V
D. 8 V
E. None of the above

Correct Answer:  A. 3 V

50. The emitter diode is usually

A. Forward-biased
B. Reverse-biased
C. Nonconducting
D. Operating in the breakdown region
E. None of the above

Correct Answer:  A. Forward-biased

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