Electronic Principles – Section 3

6. Which one of the following statements is true for the impedance of a series RC circuit?

A. The impedance is greater than the sum of the resistance and capacitive reactance
B. The impedance is equal to the sum of the resistance and capacitive reactance
C. The impedance is greater than either the resistance or capacitive reactance but less than their sum
D. The impedance is less than the sum of the resistance and capacitive reactance
E. None of the above

Correct Answer:  C. The impedance is greater than either the resistance or capacitive reactance but less than their sum

7. If a transistor operates at the middle of the load line, an increase in the current gain will move the Q point

A. down
B. up
C. nowhere
D. off the load line
E. None of the above

Correct Answer:  B. up

8. What is the turns ratio of a power transformer that shows 50 V at its secondary winding when you apply 150 V to its primary winding?

A. 1/4
B. 1/3
C. 2
D. 3
E. None of the above

Correct Answer:  D. 3

9. What is the inductive reactance of a 0.1-H coil that is operating at 1000 Hz?

A. 100 Ohm
B. Less than 1 Ohm
C. 628 Ohm
D. 444 Ohm
E. None of the above

Correct Answer:  C. 628 Ohm

10. Which one of the following is a statement of Kirchhoff’s voltage law?

A. The total voltage in a parallel circuit is less than the value of the smallest voltage
B. The algebraic sum of voltages in a loop is equal to zero
C. The voltage drop across a resistance is proportional to the value of resistance and the amount of current flowing through it
D. The algebraic sum of voltages entering and leaving a point is equal to zero
E. None of the above

Correct Answer:  B. The algebraic sum of voltages in a loop is equal to zero

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