Elenco, Quiz – Elenco 015V Power Supply Kit User Manual
Page 8
ELENCO
®
150 Carpenter Avenue
Wheeling, IL 60090
(847) 541-3800
Website: www.elenco.com
e-mail: [email protected]
Answers:
1.
B; 2
. B;
3
. C
; 4
. D
; 5
. C
; 6
. D
; 7
. C
; 8
. A;
9
. C
; 1
0.
D
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 filtered 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 ratio of the transformer in the K11 is . . .
r A. 50:1.
r B. 1:10.
r C. 120:13.
r D. 60:120.
8. The voltage at the emitter of a transistor is . . .
r A. 0.7 volts less than the base.
r B. 2 volts higher than the collector.
r C. same as the collector.
r D. 1.25 volts lower than the base.
9. A good regulator circuit . . .
r A. changes the output under load.
r B. contains many transistors.
r C. will not change under load.
r D. uses small capacitors.
10. Transistor Q2 is used to . . .
r A. rectify the AC voltage.
r B. filter the DC voltage.
r C. amplify the AC voltage.
r D. reduce the current draw from the zener.
QUIZ
Mark the box next to the letter with the correct answer.