signal processing test
Terms
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What is/are the output/s from a modulator circuit?
a. Carrier signal and information signal
b. Information signal
c. Carrier signal
d. FM signal - d. FM signal
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What type of component does a varactor component act like when reverse biased?
a. Regulator
b. Capacitor
c. Inductor
d. Resistor - b. Capacitor
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What is/are the output/s of a FM demodulator circuit?
a. Carrier signal and information signal
b. Information signal
c. Carrier signal
d. AM signal - b. Information signal
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In the NE565 chip, which pins must be directly connected to configure a FM demodulator circuit?
a. Pins 2 and 3
b. Pins 4 and 5
c. Pins 6 and 7
d. Pins 8 and 9 - b. Pins 4 and 5
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In a phase lock loop circuit, what is the output of the phase comparator?
a. AC error voltage
b. DC error voltage
c. FM center frequency
d. Amplified VCO output - b. DC error voltage
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Which characteristic of sampling pulses IS NOT changed by
the information signal in analog pulse modulation?
a. amplitude
b. position
c. width
d. phase - d. phase
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What is the Nyquist rate in relation to analog pulse modulation?
a. The lowest frequency of the sampling pulses as compared to the information signal.
b. The highest frequency of the sampling pulses as compared to the information signal.
c - a. The lowest frequency of the sampling pulses as compared to the information signal.
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In a PWM modulator, what shape do the sampling pulses normally have?
a. rectangle
b. triangle
c. square
d. sine - b. triangle
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What type of analog pulse modulation is PAM?
a. pulse amplitude modulation
b. pulse position modulation
c. pulse width modulation
d. pulse phase modulation - a. pulse amplitude modulation
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What type of analog pulse modulation is PPM?
a. pulse amplitude modulation
b. pulse position modulation
c. pulse width modulation
d. pulse phase modulation - b. pulse position modulation
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How is PWM accomplished?
a. Changing the width of a pulse according to the amplitude of the information signal.
b. Changing the amplitude of a pulse, according to the amplitude information signal.
c. Changing the position of a pulse accord - a. Changing the width of a pulse according to the amplitude of the information signal.
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How is PAM accomplished?
a. Changing the width of a pulse according to the amplitude of the information signal.
b. Changing the amplitude of a pulse, according to the amplitude information signal.
c. Changing the position of a pulse accord - b. Changing the amplitude of a pulse, according to the amplitude information signal
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What type of circuit is normally found in a PPM demodulator?
a. F/F, RC, filter
b. RC, 2 filters
c. 3 filters
d. Summers - a. F/F, RC, filter
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How is a single polarity PAM waveform developed?
a. Directly
b. By adding bias to the dual polarity waveform.
c. By adding bias to the negative polarity waveform.
d. By adding bias to the positive polarity waveform. - b. By adding bias to the dual polarity waveform.
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How is PPM accomplished?
a. Changing the width of a pulse according to the amplitude of the information signal.
b. Changing the amplitude of a pulse according to the amplitude of the information signal.
c. Changing the position of a pulse - c. Changing the position of a pulse according to the amplitude of the information signal.