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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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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.          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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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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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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11.        Which of the following is not a vacuum tube? a. traveling wave tube (TWT) oscillator b. Gunn oscillator c. Klystron oscillator d. Magnetron oscillator e. all of the above 12.        Which microwave oscillator is widely used in microwave ovens? a. a traveling wave tube oscillator (TWT) b..
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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 field frequency for U.S. NTSC television broadcasts is: a.  30 fields per second. b.  40 fields per second. c.  60 fields per second. d.  100 fields per second. 12.        The horizontal oscillator frequency for U.S. NTSC television broadcasts is set at approximately: a.  3.58 MHz. b.  30 Hz. c.  60.
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31.        Moving a full revolution around an SWR circle on the Smith chart represents: a. moving a quarter-wavelength down the transmission line. b.  moving a half-wavelength down the transmission line. c.  moving a full wavelength down the transmission line. d.  moving two wavelengths down the transmission line. 32.        The center.
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11.        A point in space that radiates  equally in all directions is: a.   parabolic reflector b.isotropic Point source c.electromagnetic wave d.an antenna e.   none of the above 12.        The term for the case when the same signal arrives at the TV receiver at the two different times is: a.ghosting b.phasing c.tagging.
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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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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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1.         For frequencies below 2 MHz, which antenna is used? a. Hertz b. vertical c. dipole d. Helmhotz 2.A λ/4 dipole at 500 MHz is used to receive a broadcast. Determine the length of the dipole. a. 1.5 M b. 3 M c. 0.9 M d. 0.6 M 3.         Which of the following is used to.
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1.          The purpose of the low-loss dielectric material (radome) used to cover the dish is: a. for protection. b. for maintenance of internal pressure. c. to improve performance. d. a and b 2.An apparatus whose theory of operation is based upon motion of electrons under the influence of combined.
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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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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.        A transmission line terminated with a short has a VSWR of: a.  –1. b.  0. c. +1. d.  infinity. 22.        A transmission line terminated with a load resistance that is equal to the transmission line's characteristic impedance has a VSWR of: a. –1. b. 0. c. +1 d.  infinity. 23.        .
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1.Charge coupled devices (CCD's) are typically found in which of the following camera applications? a. camcorder cameras b.  security monitors c.  video phones d.  all of the above 2.          The interval of time it takes the moving electron beam to move from the end of one line back to the start of.
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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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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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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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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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21.The term for the situation when two or more broadcasting channels bleed into each other is called. a.              multi-path fading b.   diversity reception c.multi-frequency fading d.co-channel interference e.non of the above 22.        At resonance, the impedance of a crystal should be; a.maximum b.minimum c.variable d.   a and c e.   none of the.
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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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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.          Which of the following factors is not used to determine a mode of energy transmission? a. power level and efficiency b. reliability c. cost and maintenance d. environmental conditions 2.          The type of wave propagated by a waveguide is: a. quantum. b. electromagnetic. c. acoustic. d. .
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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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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.       Antenna gain provided with respect to an isotropic radiator is expressed as: a.   dBm b.   dBV c. dBW d.   dBi 12.       The antenna gain, given in decibel with respect to a dipole is expressed as: a.   dBd b.   dBV c. dBW d.   dBi 13.An  impedance matching device that spreads the transmission line as.
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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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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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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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11.        One wavelength of waveguide, when compared to one wavelength of free space is: a. larger. b. smaller. c. the same length. 12.        Circular waveguide is advantageous to rectangular waveguide in: a. its cost. b. continuously rotating radar applications. c. its cross-sectional area. d. its size. 13.       .
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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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1.          The polarization of an electromagnetic wave is determined by the direction of: a. B field. b.  H field. c. E field. d. all of the above. 2.The diffraction process allows reception beyond a mountain in all but a small area known as: a. dead zone. b. shadow zone..
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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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