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-17-
QUIZ
1. AC voltage is supplied to the rectifier stages by the . . .
r A. step up transformer.
r B. step down transformer.
r C. 1 to 1 transformer.
r D. AC to DC transformer.
2. The secondary windings of the transformer are . . .
r A. 90
O
out of phase.
r B. 180
O
out of phase.
r C. 270
O
out of phase.
r D. 320
O
out of phase.
3. Diodes allow current to flow . . .
r A. when the anode is more negative than the cathode.
r B. when the cathode is more positive than the anode.
r C. in one direction.
r D. when a negative or positive voltage is on the anode.
4.
What circuit is more efficient for rectifying AC to DC?
r A. Hartley oscillator.
r B. Half-wave.
r C. Schmitt trigger.
r D. Full wave.
5. The DC voltage is smoothed by using a . . .
r A. half-wave rectification circuit.
r B. small value capacitor with a high voltage value.
r C. Large value capacitor.
r D. 90
O
out of phase rectification circuit.
6. An inefficient rectification circuit usually contains . . .
r A. large gaps between cycles.
r B. twice the AC voltage needed.
r C. more diodes.
r D. all of the above.
7. The maximum current that a diode can handle is determined by . . .
r A. the transformer’s current rating.
r B. the amount of AC ripple.
r C. three times the diode rating.
r D. peak current rating.
8. The LM-317 will shut down when . . .
r A. the output voltage is too high.
r B. no current is being drawn.
r C. the junction overheats.
r D. the output voltage drops to 1.25V.
9.
The LM-317 regulator contains . . .
r A. a pass transistor.
r B. a constant current source.
r C. a differential amplifier.
r D. all of the above.
10. The LM-317 is basically . . .
r A. a 1.25V regulator.
r B. a 6.25V regulator.
r C. a 2.5V regulator.
r D. a negative voltage regulator.
Answers: 1. B, 2. B, 3. C, 4. D, 5. C, 6. A, 7. D, 8. C, 9. D, 10. A
XP-720K_REV-H_111114.qxp_XP-720K REV-H 111114 7/31/15 1:08 PM Page 18
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