Anaolog circuits final exam

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School

Daytona State College *

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EET2142C

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Electrical Engineering

Date

Feb 20, 2024

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docx

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Uploaded by SuperHumanFire1222

Question 1 (4 points) Saved In high level modulation Question 1 options: The carrier signal is added at the last possible point before before the transmiting antenna. The intelligence signal is added at the last possible point beofre the transmitting antenna. The carrier signal is added at a point before the final output stage. The intelligence signal is added at a point before the final output stage. Question 2 (4 points) Saved The Trapezoidal display in the communication system Question 2 options: is a technique to measure the performance of the modulated transmission system. is a dual display of the intelligemce signal with respect to the AM signal. it is used to detect any poor linearity. all the above. Question 3 (4 points) Saved The output of the balanced modulator in a SSB transmission is the Question 3 options:

double side band with a carrier signal double side band without the carrier signal demodulated upper side band demodulated lower side band Question 4 (4 points) Saved Transistor High-level modulator is Question 4 options: Class A operation Class AB operation Class B operation Class C operation Question 5 (4 points) Saved A Spectrum analyzer is an instrumnet to trouble shoot Question 5 options: In time domain in frequency domain in phase domain in s domain

Question 6 (4 points) Saved Which of the following method is used to generate SSB? Question 6 options: filter method phase method reactance modulator method both a and b answers Question 7 (4 points) Saved This device is used in FM, it has a small capacitance that varies with the reversed voltage applied. Question 7 options: potentiometer transistor inductor varactor diode Question 8 (4 points) Saved In the SSB transmitter block diagram, what is the reason for second balanced modulator?

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Question 8 options: To eliminate the carrier signal. To provide double side band at carrier frequency To filter out one of the side bands. To adjust to desired tranmitting frequency. Question 9 (4 points) Saved This type of FM modulator uses phase modulation of the crystal oscillator to indirectly generate FM. Question 9 options: Crosby modulator Armstrong modulator Carson's modulator Phase Lock Loop Question 10 (4 points) Saved Stereo FM transmission ues _______________ to effeciently transmit signals over a single medium. Question 10 options: frequency multiplexing phase multiplexing

time multiplexing wavelength multiplexing Question 11 (4 points) Saved Sensitivity of a receiver is Question 11 options: the extent to which receiver differentates between the desired signal and other frequencies. the maximum input frequency to produce a specified output. the minimum input voltage to produce a specified output. none of the above. Question 12 (4 points) Saved Selectivity of a receiver is Question 12 options: the extend to which receiver differentiates between the desired signal and other frequencies. the maximum input frequency to produce a specified output. the minimum input voltage required to produce a specified output. none of the above. Question 13 (4 points) Saved

The advantage of the superheterodyn receiver to the Tuned Frequency Receiver (TFR) is: Question 13 options: that superheterodyn receiver is simpler that superheterodyn has three different RF tuning circuit. that its LO frequency is tune to the RF signal such that to produce constant IF frequency signal. that they eliminate image frequency. Question 14 (4 points) Saved The intermediate frequency (IF) signal in the AM receiver is about: Question 14 options: 10 kHz 150 kHz 455 kHz 10.7 Mhz Question 15 (4 points) Saved The intermediate frequency (IF) signal of a FM receiver is about: Question 15 options: 10 kHz

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150 kHz 455 kHz 10.7 MHz Question 16 (4 points) Saved A superheterodyn receiver has a RF signal of 1000 kHz, and the LO frequency of 1500kHz. The output of the mixer is at: Question 16 options: 500 kHz. 1000 kHz. 1500 kHz. 2000 kHz. Question 17 (4 points) Saved To eliminate the image frequency in the superheterodyn receiver which of the following technique is used. Question 17 options: double conversion up conversion delayed AGC both a and b

Question 18 (4 points) Saved AM demodulation is done Question 18 options: using the product detector using simple diode detector using discreminator using limiter Question 19 (4 points) Saved In the FM receiver, the discriminator Question 19 options: removes any residual amplitude variation due to noise. reduces image frequency, and local oscillator re-radiation. Extracts the intelligence signal amplitude variation. restores the amplitude of high frequency components of the intelligence signal. Question 20 (4 points) Saved In a FM receiver, the deemphasis circuit Question 20 options: removes any residual amplitude variation due to noise.

reduces image frequency, and the local oscillator re-radiation. extracts the intelligence signal. restores the amplitude of the high frequency component of the intelligence signal. Question 21 (4 points) Saved The intermodulation distortion in recievers is mainly due to Question 21 options: second order frequency components third order frequency components. fifth order frequency components. both b, and c above. Question 22 (4 points) Saved This circuit used in receiver to silence the audio amplifier stage until the carrier signal is detected. Question 22 options: Delayed AGC Product detector Deemphasis squelch

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Question 23 (4 points) Saved Phase lcok Loop (PLL) is used: Question 23 options: to demodulate FM as frequency sentisizer as the phase detector all of the above Question 24 (4 points) Saved In the SSB receiver the BFO is necessary because Question 24 options: The signal transmitted is double side band. The intelligence signal is not modulated. The transmitted signal's carrier is suppressed, need the carrier to be reinserted. Additional oscillator make the recovery faster. Question 25 (4 points) Saved This function in the conventional receivers is used to allow listening without need to monitor volume control. Question 25 options: