Exam (elaborations)
CET part 2 questions and correct answers
- Course
- Institution
CET part 2 questions and correct answers
[Show more]
Content preview
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
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller BravelRadon. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $12.99. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
72042 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now