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CET part 2 questions and correct answers
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CET part 2 questions and correct answers
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CET part 2 questions and correctanswers
What does the acronym FCC stand for? - correct answer ✔✔Federal Communications Commission
What is not a part of a superheterodyne radio receiver? - correct answer ✔✔Audio Radiation Resistance
Circuit
Which part of a superheterodyne receiver rectifies the RF carrier? - correct answer ✔✔Detector Circuit
How long should a 1/4 wavelength vertical antenna be that is designed for operation on 146 MHz? -
correct answer ✔✔1.6 feet
What is the common impedance of radio communication and television coaxial cable, respectively? -
correct answer ✔✔50 and 75 ohms
Which layer of the ionosphere absorbs high frequency radio waves during daylight hours? - correct
answer ✔✔D Layer
Which style of antenna has a radiation pattern of 180 degrees? - correct answer ✔✔Dipole
What frequency band is an average AM commercialbroadcast radio capable of receiving? - correct
answer ✔✔540 to 1630 KHZ
Why is RF safety important? - correct answer ✔✔To limit human exposure to RF for health reasons
What is the process of imposing intelligence on a carrier wave? - correct answer ✔✔Modulation
The basic formula for wavelength is: L=wavelength, v=velocity, f=freq. - correct answer ✔✔L=v/f.
, Flexible coaxial transmission lines are ideal for what frequencies? - correct answer ✔✔Below GHz
Standing waves occur on a transmission line when there is a /an _____ between the transmission line
and the load. - correct answer ✔✔impedance mismatch
Maximum power transfer to the load occurs when the load impedance matches that of the transmission
line. (True/False) - correct answer ✔✔True
Antenna resonance is the characteristic that permits ________ radiation of the transmitted signal. -
correct answer ✔✔maximum
Space waves are ideal for what frequency of communications? - correct answer ✔✔Line-of-sight UHF
Electromagnetic field polarization is determined by orientation of what part of the electromagnetic
wave? - correct answer ✔✔Electric lines of force
The orientation of the transmitter antenna and the receiver antenna must match for ideal reception.
(True/False) - correct answer ✔✔True
Quarter-wave antennas must be _____ at one end for resonance at the desired frequency. - correct
answer ✔✔in free space
On hook DC voltage on a telephone local loop is______. - correct answer ✔✔- 48 volts
Dial Tone is composed of these two frequencies ______. - correct answer ✔✔350 + 440 Hz
The DTMF tones for the number 5 on a telephone keypad is ________. - correct answer ✔✔770 + 1336
Hz
A trunk connects ___________. - correct answer ✔✔two central offices
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