1.An electronic device that will generate and combine (in phase) 400 Hz, 800 Hz, 1200 Hz, 1600 Hz, 2000 Hz,
and 2400 Hz signals will produce a(n)
A.sine wave.
C.imperfect sawtooth wave.
B.perfect sawtooth wave.
D.imperfect square wave
2.a specific type of relaxation oscillator that has,in its only stable state,one transistor stage conducting and one of is known as
a.bistable
b.harmonic generator
c.single shot
d. clamper
3.in an RC series circuit,the total resistance found to be 250k Ohms. How long will it take the 300 microfarad capacitor to charge to a point very close to its maximum voltage?
a. .833 seconds
b. 6.25 minutes
c. 1.2 microseconds
d. 6.25 seconds
4.An amplifier output is being evaluated by a technician. The output is found to be a sine wave. The measured time lapse from one sine-wave peak to the next is 5 milliseconds. The signal
a.has a period of 10 milliseconds
b.has a frequency of 200 Hz.
c.can't be a sine wave as they don't have such short periods
d.has a period of 2.5 milliseconds
5.A PNPN diode is commonly found in oscillator circuits to produce a
a. square-wave pulse train
b.pure sine wave
c.perfect square-wave
d.sawtooth wave
6.An AC voltage signal is observed on an oscilloscope to have a peak-to-peak value of 240V.What is the effective voltage of this signal?
a.120V
b.168V
c.84V
d.240V
7.A group of sine waves with frequencies of 1000,2000,3000,4000, and 5000 Hz combine to form a nonsinusoidal wave. The wave with the longest period is
a.a square-wave
b.fifth harmonic
c.second harmonic
d.fundamental frequency