26. What is the algebraic sum of this series of values:+2, -3, -6,+4?

A. -6
B. -3
C. 0
D. +2
E. None of the above

27. When operating below its resonant frequency, a parallel RLC circuit has the characteristics of a:

A. parallel RL circuit
B. parallel RC circuit
C. parallel RLC circuit operated above its resonant frequency
D. purely resistive circuit
E. None of the above

28. What causes the depletion layer?

A. Doping
B. Recombination
C. Barrier potential
D. Ions
E. None of the above

29. Which one of the following statements most accurately reflects the nature of ac power?

A. The current in an ac circuit flows in one direction, but changes value periodically
B. The current in an ac circuit flows in one direction at a steady level
C. The current in an ac circuit changes direction periodically
D. The current in an ac circuit flows in two directions at the same time
E. None of the above

30. A step-up transformer has a turns ratio of 1:4. If the line voltage is 115 V rms, what is the peak secondary voltage?

A. 700 V
B. 707 V
C. 651 V
D. 208 V
E. None of the above