A) Marconi B) Bell C) Maxwell D) None of these E) Hertz
A) the signal-to-noise ratio B) the carrier frequency C) the baseband frequency range D) None of these E) the signal-plus-noise to noise ratio
A) sub-channeling B) None of these C) SINAD D) multiplexing E) signal switching
A) baseband frequencies "mixing" with each other B) baseband frequencies "mixing" with each other C) All of the above D) creation of harmonics of baseband frequencies E) None of these
A) 20 Hz to 15,000 Hz B) approximately 3 kHz C) All of the above D) None of these E) at least 5 kHz
A) greater at high frequencies B) the same at all frequencies C) the same as "white" noise D) None of these E) greater at low frequencies
A) VT = sqrt(V1 × V2) B) None of these C) VT = sqrt(V1 × V2) D) VT = (V1 + V2)/2 E) VT = sqrt(V1 × V1 + V2 × V2)
A) All of the above B) first add the signal power to the noise power, then divide by noise power C) signal voltage divided by noise voltage D) None of these E) signal power divided by noise power
A) how much noise is in the channel B) how much noise an amplifier adds to a signal C) None of these D) signal-to-noise ratio in dB E) how much noise is in a communications system
A) first add the signal power to the noise power, then divide by noise power B) signal voltage divided by noise voltage C) signal power divided by noise power D) None of these E) All of the above
A) 300 B) 400 C) None of these D) 500 E) 200
A) 60 B) 40 C) 50 D) None of these E) 30
A) spectrum signal monitor B) spectrum domain monitor C) spectrum analyzer D) None of these E) spectrum displayer
A) 50 μV B) 60 μV C) None of these D) 40 μV E) 30 μV
A) 50 dB B) 20 dB C) 30 dB D) None of these E) 40 dB
A) 1.5 B) None of these C) 0.5 D) 2.5 E) 1
A) All of the above B) cause an amplifier to lose gain C) None of these D) reduce the bandwidth of an amplifier E) cause an amplifier to oscillate
A) it cannot be avoided B) increasing the Q of the tuned circuit C) using a common-base amplifier D) using a common-emitter amplifier E) None of these
A) a signal containing harmonics B) an input signal that is an integer multiple of the desired frequency C) a nonlinear circuit D) a linear amplifier E) None of these
A) the Barkhausen criteria B) the loop-gain criteria C) the Bode criteria D) None of these E) the Hartley criteria
A) short B) fast C) long D) None of these E) slow
A) distributed B) combined C) connected D) dispersed E) None of these
A) decoupling B) recoupling C) None of these D) uncoupling E) coupling
A) 6.2 μH B) 6.4 μH C) 9.2 μH D) None of these E) 5.4 μH
A) 500 B) 10 C) 1000 D) of None these E) 100
A) 0.1 B) None of these C) 0.5 D) 0.2 E) 0.3
A) 28 pF B) 40 pF C) None of these D) 53 pF E) 30 pF
A) Amplitude Modulation B) Antenna Modulation C) None of these D) Audio Modulation E) Angle Modulation
A) All of the above B) the amplitude signal C) None of these D) the baseband signal E) the carrier signal
A) the signal-to-noise ratio to increase B) None of these C) the received RF signal to increase D) All of the above E) the audio to get louder at the receiver
A) All of the above B) is more efficient C) requires less bandwidth D) requires a more complex demodulator circuit E) None of these
A) None of these B) single-carrier C) suppressed-carrier D) self-carrier E) sideband-carrier
A) increases with deviation and decreases with modulation frequency B) decreases with deviation and increases with modulation frequency C) is equal to twice the deviation D) increases with both deviation and modulation frequency E) None of these
A) it is equal to the frequency deviation B) None of these C) it is band-limited at the receiver D) the power in the outer sidebands is negligible E) there can only be a finite number of sidebands
A) 0.11 B) None of these C) 0.5 D) 0.2 E) 0.3
A) 11 kHz B) 10 kHz C) None of these D) 13 kHz E) 12 kHz
A) 20 kHz B) 68 kHz C) None of these D) 50 kHz E) 48 kHz
A) 50% B) 80% C) 72% D) 100% E) None of these
A) fast B) None of these C) small D) slow E) large
A) class C B) class B C) class A D) class D E) None of these
A) 206 MHz B) None of these C) 100 MHz D) 29 MHz E) 152 MHz
A) 2 MHz B) 8 MHz C) 16 MHz D) 4 MHz E) None of these
A) 75 degrees B) 360 degrees C) 90 degrees D) 180 degrees E) None of these
A) 119 MHz B) 220 MHz C) 216 MHz D) 300 MHz E) None of these
A) None of these B) 250 kHz C) 40 kHz D) 61 kHz E) 191 kHz
A) 150 kHz B) None of these C) 70 kHz D) 54 kHz E) 70 kHz
A) PCM B) None of these C) T-1 D) PAM E) CODEC
A) T-1 B) CODEC C) TCM D) PAM E) None of these
A) None of these B) 10 Ω C) 75 Ω D) 120 Ω E) 100 Ω
A) 5 B) 0 C) 1 D) None of these E) 2
A) 1.46 B) None of these C) 3.8 D) 2.5 E) 1.5
A) 50 Ω B) None of these C) 28 Ω D) 50 Ω E) 73 Ω
A) 250 W B) 372 W C) 480 W D) 483 W E) None of these
A) 10 GHz B) 25 GHz C) 1.2GHz D) 5.9 GHz E) None of these
A) None of these B) Radar C) Yagi D) Gunn E) Tunnel
A) None of these B) 6 GHz to 30 GHz C) 3 GHz to 30 GHz D) 4 GHz to 30 GHz E) 5 GHz to 30 GHz
A) Battery pack B) UV rays C) Electricity D) Solar cells E) None of these
A) 60 MHz B) 50 MHz C) 80 MHz D) 70 MHz E) None of these
A) FREQUENCY B) ASCII C) DECIMAL D) None of these E) BINARY
A) None of these B) 8 bits C) 7 bits D) 9 bits E) 10 bits
A) 500 MHz B) 1000 MHz C) 100 MHz D) 750 MHz E) None of these
A) QWERTY B) QPSK C) DPSK D) None of these E) CODEC
A) NOR B) XOR C) OR D) None of these E) AND
A) 1 KM B) 2 KM C) 5 M D) None of these E) 70 M
A) Twisted wires B) Cladding C) None of these D) Fiber glass E) Rubber
A) 400 to 750 nm B) 200 to 750 nm C) 150 to 750 nm D) None of these E) 500 to 750 nm
A) None of these B) Side bias C) Forward bias D) Backward bias E) All of the above
A) None of these B) 5.57 dB C) 29.1 dB D) 10 dB E) 4.71 dB
A) None of these B) 1,000,000 m/s C) 200,000,000 m/s D) 300,000,000 m/s E) 100,000,000 m/s
A) polar B) bipolar C) All of the above D) None of these E) unipolar
A) HDB3 B) None of these C) B8ZS D) B4B8 E) All of the above
A) Line coding B) None of these C) All of the above D) Block coding E) ________ provides synchronization without increasing the number of bits.
A) baud transfer B) None of these C) synchronization D) All of the above E) bit transfer
A) analog-to-digital B) analog-to-analog C) None of these D) digital-to-digital E) digital-to-analog
A) bit B) All of the above C) signal D) None of these E) baud |