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11.        The type of PCM coding scheme that is popular in optical systems, satellite telemetry links, and magnetic recording systems is: a.  NRZ – non-return to zero. b.  RZ – return to zero. c.  phase-encoded and delay modulation. d.  multilevel binary. 12.        Which of the following error detection schemes does not.
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51.        The advantage of indirect FM modulation over direct FM modulation is: a.  in their improved frequency stability. b.  in their increased frequency deviation. c.  in their ability to work with small signal amplitudes. d.  in their ability to work at higher intelligence frequencies. 52.        The disadvantage of indirect FM modulators is: a. .
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Figure 4-1 21.        Calculate the required Q for the bandpass filter depicted in Figure 4-1 for 80 dB sideband suppression if the carrier frequency component of the IF is 455 kHz. a. 1137.5 b.  56,875 c.  227,500 d.  113,750 22.        Crystal filters: a.  have Q values as high as 50,000. b.  employ phasing.
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1.          Which of the following is a definition of characteristic impedance? a.  coaxial line impedance b.  impedance at any point c.  impedance of infinite line d.  impedance at front end 2.          When moving from the source to load current and voltage traveling waves move: a.  30° phase shift b.  60° phase shift.
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Figure 2-1 11.        In Figure 2-1, A is 220 mVp-p and B is 350 mVp-p.  The percent modulation of the AM signal is: a. 62.9% b. 1.59% c. 22.8% d. 4.38% 12.        In Figure 2-1, Ei is 530 mV peak and Ec is 780 mV peak. The percent modulation of the AM signal is: a. 67.9% b. 32.1% c. 19.1% d. 14.7% 13.        In Figure 2-1, A.
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31.        Narrowband FM stations: a.  use a maximum deviation of 10 kHz. b.  use intelligence frequencies ranging from 100 Hz to 3 kHz. c. are found in police, aircraft, taxicabs, weather service, and industrial applications. d.  all of the above. 32.        The modulation index that occurs when the deviation and intelligence.
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11.        Which will reduce the radiation loss of transmission line? a. use coaxial transmission line b.  use better shielding c. terminate the line with a resistive load equal to the transmission line's characteristic impedance d.  all of the above 12.        Determine the amount of delay in a 200 ft. section.
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1.          A technique for resolving complex repetitive waveforms into sine or cosine waves and a dc component is known as: a.   Harmonic Analysis b.   Armstrong's Principle c.   Fourier Analysis d.   Frequency Analysis 2.          Shot noise is directly related to: a.   dc current. b.   ac voltage. c.   resistor value. d.   boltzman.
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61.        In FM stereo broadcasts, why are the left and right audio signals first converted to L+R and L-R signals before being frequency modulated? a. This is necessary to be able to be multiplexed properly. b.  This permits higher intelligence frequencies to be used. c. This permits compatibility between monaural.
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Figure 2-4a 31.        In Figure 2-4a, the trapezoidal display indicates: a. improper bias or low carrier signal power. b.  proper in-phase trapezoidal pattern for typical AM signal. c. poor linearity of the modulator. d.  lack of an intelligence signal. Figure 2-4b 32.        In Figure 2-4b, the trapezoidal display indicates: a. improper bias or.
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41.The signal processor that increases all negative dBm power levels and at the same time decreases all positive dBm power levels is: a. a signal expander. b.  a linear amplifier. c. a signal compressor. d.  a phase-locked loop. 42.        The signal processor that decreases all negative dBm power levels and.
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41.        A number that identifies the switch nearest to the caller is called which of the following. a. Destination Point Code b. Circuit Identification Code c. Source Identification Code d. Origination Point Code 42.        A number that identifies the switch nearest to the called party is called which of the following..
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11.        Which of the following does not occur in a limiter stage found in an FM receiver? a. amplifying a signal with an easily overdriven amplifier b.  clipping action of the FM signal c. recreating the intelligence signal d.  recreating the FM sinewave due to the flywheel effect 12.        The measure.
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11.        Which OSI level is associated with handling error recovery, flow control, and sequencing? a. physical b.  data link c.  network d. transport e. session 12.Which OSI level accepts outgoing messages and combines messages into packets, adding a header? a. physical b.  data link c.  network d. transport e. session 13.       .
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11.        Which is not an advantage of digital data communication systems over analog communications? a  They have narrower bandwidths. b.  They have superior noise performance. c. They eliminate errors in the received signal. d.  They have the ability to process the signal at the transmitter and receiver using digital signal processing.
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1.          SSB transmitters are usually rated in terms of: a.  power gain. b.  voltage gain. c. modulation index. d.  peak envelope power. 2.          Which of the following is required for SSB transmission? a. carrier elimination. b.  elimination of one sideband. c. a and b d.  none of the above 3.Which of the following.
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31.        In Figure 4-2, the first mixer and filter are necessary to: a.  produce SSB at the final transmitter output frequency. b.  produce SSB using filters having adequately high Q values. c. produce DSB-SC at the final transmitter output frequency. d.  produce DSB-SC using filters having adequately high Q values. 32.        In.
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1.          The modulation index is: a. top envelope divided by center frequency. b.  deviation divided by intelligence frequency. c.  VCO voltage divided by center frequency. d.  all of the above. 2.          Noise is usually clipped by: a. amplifiers. b.  phase detectors. c. limiter circuits d.  ARC circuits. 3.          If the S/N of.
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1.          Which of the following is not an advantage of a synchronous detection? a. Low distortion b. Eliminate diagonal clipping c. Greater ability to follow fast-modulated signals d. Ability to produce gain 2.          The mixer is often referred to as: a. RF amplifier. b. oscillator generator. c. .
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41.        A de-emphasis network has: a. an upper cutoff frequency of 2.120 kHz. b.  a time constant of 75 microseconds. c. a high-frequency roll-off rate of –20 db per decade. d.  all of the above. 42.        The main purpose of pre-emphasis and de-emphasis networks in FM communication systems is.
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11.        The type of noise that is often produced by spark-producing equipment is known as: a.   man-made noise. b.atmospheric noise. c.thermal noise. d.   transistor noise. 12.        Which is NOT an example of internal noise? a.   Noise produced by resistors b.   Noise produced by transistors and integrated circuits c.   Excess noise d.  .
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21.        The RF spectrum shown in Figure 10-5 is an example of a.  direct sequence spread spectrum b. orthogonal frequency division multiplexing c. frequency division spread spectrum d. frequency hopping spread spectrum Figure 10-5 22.        DSSS uses a pseudorandom sequence of pulses shorter than the message bit. These are called a..
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1.          Which transformer allows full duplex operation by providing isolation between the transmit and receive legs of the system? a.  primary b.  step-up c. line hybrid d.  secondary 2.The process of using the same carrier frequency in different cells that are geographically separated is known as: a.  frequency reuse. b.  narrowband FM bandwidth.
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21.        The distance of a received code (00111) from a valid code of (00101); a. 1 b. 2 c. 3 d. 4 22.        Given a (7,4) cyclic code, the length of the message is: a. 1 b. 2 c. 3 d. 4 23.        Given a (7,4) cyclic code, the length of the BCC is: a. 1 b. 2 c. 3 d. 4 24.        Reed-Solomon codes are: a.forward error-correcting b.seldom used c.also called CRC codes d.none.
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21.        CSMA/CD stands for: a.   Carrier Sense Many Applications Common Data b.   Carrier Sense Multiple Access with Collision Detection c.   Carrier Sense Multiple Access with Common DATA d.   None of the above 22.        The length of a MAC address is : a.56 bytes b.4 bytes c.6 bytes d.3.
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1.The three groups of wireless technologies are: a.  wired wireless, mobile wireless, IR wireless b.  wired wireless, mobile wireless, wired IR c.  fixed wireless, mobile wireless, IR wireless d. fixed wireless, mobile wireless, wired wireless 2.          Determine the channel bandwidth required for a wideband FSK system. a. 5 to 10 kHz b.  5.
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1.Which of the following is NOT produced when two sine waves are combined through a nonlinear device? a.Components of each of the two original frequencies b.Components at the sum and difference frequencies c.              Harmonics of the two original frequencies d.   ac level 2.          Which of the following is considered a nonlinear.
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11.        The type of sideband that is used for television video transmission is called: a. independent sideband. b.  SSBSC c.  ACSSB. d.  vestigial sideband. 12.        A more recently developed system of sideband that involves compressing the amplitude of the intelligence signal before modulation occurs is called: a. independent sideband. b.  SSBSC c. .
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1.          In FM reception, the circuitry used to extract the intelligence from the carrier is: a.  VCO. b.  Crosby modulator. c. limiter. d.  discriminator. 2.          A form of receiver noise called cross modulation is caused by: a.  noise caused by using non-square law device. b.  noise caused by using JFETs. c.  noise caused.
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31.        The oscillator design that is characterized by having a "tapped" inductor is the: a.Hartley design. b.Clapp design. c.Colpitts design. d.Crystal design. 32.        The oscillator design that uses two capacitors in the tank circuit is the: a.Hartley design. b.Clapp design. c.Colpitts design. d.Crystal design. 33.        The oscillator design that has the highest frequency.
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21.        Hartley's law states that: a.   bandwidth is directly proportional to both the amount of information and time of transmission. b.   the amount of information is directly proportional to both the system bandwidth and time of transmission. c.   the time of transmission is directly proportional to both the system.
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1.          Which of the following can be used to generate PWM? a. PCM b. PPM c. PAM d.  PTM 2.          In what type of transmission is bit rate and baud rate the same? a. analog b.  pulse amplitude modulation c.  binary transmission d.  hexadecimal transmission 3           Baseband analog data channels are characterized.
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31. The                           by Kohn Pederson Fox is an example of the contemporary competitive spirit in the design of skyscrapers. 32. Robert Estes works in the                           style, in which artists create such highly detailed works that their paintings seem to be color photographs. 33. Because he did not go.
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51.        In which stages of Figure 4-4 should an AGC control signal be applied? a. stages a and d b. stages b and e c. stages c and f d.  stages e and g Figure 4-5 52.        In Figure 4-5, transistor Q1 functions: a. to recreate the original intelligence.
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21.        Carson's rule is: a.  a quick approximation method to find the bandwidth of an FM signal. b.  a quick approximation method to find the index of modulation of an FM signal. c.  a quick approximation method to find the bandwidth of a PM signal. d.  a quick approximation method to find.
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