Elenco Deluxe Digital / Analog Trainer with Tools Kit Version - Manual (Page 26)

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QUIZ - POWER SUPPLY SECTION
INSTRUCTIONS - Complete the following examination and check your answers carefully.
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.
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 . . .
A. the transformer’s current rating.
B. the amount of AC ripple.
C. three times the diode rating.
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.
Ans wer s: 1. B ; 2 . B ; 3 . C ; 4 . D ; 5 . C ; 6 . D ; 7 . D ; 8 . C ; 9 . D ; 1 0. A