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CIE-10 Quiz 6

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1: The next 7 questions reference Lab 14. What was the approximate unloaded RMS voltage coming our of the wall-wart power supply

8
10
14
24

2: To convert RMS voltage to peak voltage you

divide RMS by 1.414
multiply RMS times 1.414
divide RMS by 2.828
multiply RMS by 2.828

3: Until C1 was installed, the voltage coming out of the bridge rectifier at the temporary 10kohm resistor

had a lot of ripple
was fairly free of ripple
did not produce a voltage
was about 6 volts peak to peak

4: Electrolytic capacitors are usually

tiny
non-polarized
ceramic
polarized

5: Approximately how much current was flowing through the white LED?

5 mA
8 mA
12 mA
18 mA

6: The 1N5240B zener diode has a rated voltage of ___ volts.

5
10
15
20

7: About how much would you expect to pay each for this diode from the least expensive version from Mouser in 100 piece quantity?

3¢
10¢
25¢
50¢

8: An amplifier has an output of 5 volts with an input of 300 millivolts. What is the dB gain of the amplifier (assume equal input & output impedances)?

3 dB
6 dB
12 dB
24 dB

9: With a 10 kohm resistor and a 22 microfarad capacitor, about how long will it take for the voltage to come to 65% of the battery voltage after the switch is turned on?

a tenth of a second
a quarter of a second
400 milliseconds
one second

10: A low pass filter uses a 100 kohm resistor and a 500 picofarad capacitor. What frequency will the filter show 3 dB of attenuation?

800 Hz.
1600 Hz.
3200 Hz.
6400 Hz.

11: A musical note is 440Hz. What is the frequency of the note an octave above this note

220 Hz.
320 Hz.
660 Hz.
880 Hz.

12: You observe a signal on an oscilloscope as having a period of 16.7 milliseconds. What frequency does this correspond to?

30 Hz.
60 Hz.
90 Hz.
120 Hz.

13: After a low-pass filter "turns the corner", the attenuation is

6 dB/decade
10 dB/octave
20 dB/octave
20 dB/decade

14: Two waves that are identical in frequency but have a time difference in their waveforms

are in resonance with one another
have transmogrification
are said to have phase shift
are in dissonance with one another

15: Phase shift and delay

are two ways of expressing the same phenomenon
mean totally different things
are unequal at the corner frequency
cannot be measured with an oscilloscope

16: A single RC low pass filter

Has 90° phase shift at the corner frequency
does not exhibit phase shift
cannot be used on an ac signal
has 45° phase shift at the corner frequency

17: What is the capacitive reactance of a 100 pf capacitor at 150 kHz.?

11 nanofarads
11 kohms
94 micro-ohms
94 picofarads

18: The greek letter "omega" (looks like a "w")

2* pi*frequency*inductance
2* pi*frequency*capacitance
2*pi*frequency
1/(2*pi*(sqrt (L*C)))

19: The impedance of a parallel resonant LC circuit

is very high
is very low
cannot be measured
is equal to the impedances of the L and C separately

20: A series resonant LC circuit

is very high
is very low
cannot be measured
is equal to the impedances of the L and C separately

21: The resonant frequency of a 100 pf capacitor and a 250 microhenry inductor is

1E-6 Hz.
250 kHz.
1 MHz.
5 MHz.

22: Tuning today's radios is generally done with a

slug-tuned inductor
mechanically rotatable capacitor
forward-biased diode
reverse-biased diode

23: What was the resonant frequency of the LC circuit in Lab 16?

5 kHz
50 kHz
250 kHz
500 kHz.

24: What was the value of the "unknown" inductor in Lab 16?

1.0 millihenries
50 microhenries
500 microhenries
250 microhenries

25: What is the approximate lowest cost of one of these inductors from Mouser in quantities of 100?

88¢
$1.25
$2.37
$4.75

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