Elenco Motion Detector Kit - Manual (Page 16)

-15-
QUIZ
1. The 9V battery supplies a . . .
r A. positive AC voltage.
r B. DC voltage.
r C. AC voltage.
r D. rectified DC voltage.
2. A human’s maximum thermal radiation is between . . .
r A. 3 and 5µm.
r B. 9 and 13µm.
r C. 10 and 20µm.
r D. 9 and 10µm.
3. As temperature changes, the pyroelectric crystals generate . . .
r A. white light.
r B. infrared light.
r C. heat.
r D. a voltage.
4. A wavelength is the distance between two points having . . .
r A. opposite phases.
r B. two different phases.
r C. the same phase, but different voltages.
r D. the same phase and voltage.
5. Infrared can be thought of as heat radiation because the . . .
r A. electrical energy is transformed into heat.
r B. radiant energy is transformed into heat.
r C. mechanical energy is transformed into heat.
r D. solar energy is transformed into heat.
6. What are the two inputs called in an op-amp?
r A. non-inverting and inverting.
r B. V
1
and V
2
.
r C. V
EE
and V
CC
.
r D. gates.
7. A high pass filter attenuates all signals . . .
r A. between two frequencies.
r B. below the critical frequency.
r C. above the critical frequency.
r D. with high amplitudes.
8. The formula for the closed loop gain is . . .
r A. (R2 x R1)Vo
r B. (R1/R2)Vi
r C. (R2/R1)Vo
r D. -(R2/R1)Vi
9. A low pass filter attenuates all signals . . .
r A. between two frequencies.
r B. below the critical frequency.
r C. above the critical frequency.
r D. with low amplitudes.
10. A filter with a high value in Q has a . . .
r A. wide bandwidth.
r B. narrow bandwidth.
r C. long bandwidth.
r D. attenuates less frequencies.
Answers: 1. B, 2 . D , 3 . D , 4 . D , 5 . B, 6 . A, 7 . B, 8 . D , 9 . C , 1 0. B