Electronics World articles Popular Electronics articles QST articles Radio & TV News articles Radio-Craft articles Radio-Electronics articles Short Wave Craft articles Wireless World articles Google Search of RF Cafe website Sitemap Electronics Equations Mathematics Equations Equations physics Manufacturers & distributors Engineer Jobs LinkedIn Crosswords Engineering Humor Kirt's Cogitations Engineering Event Calendar RF Engineering Quizzes USAF radar shop Notable Quotes App Notes Calculators Education Engineering Magazines Engineering magazine articles Engineering software Engineering smorgasbord RF Cafe Archives RF Cascade Workbook 2018 RF Stencils for Visio RF & EE Shapes for Word Advertising RF Cafe Homepage Sudoku puzzles Thank you for visiting RF Cafe!
everythingRF RF & Microwave Parts Database (h2) - RF Cafe

Modern Communications Receiver Design and Technology
RF Cafe Quiz #32

RF Engineering Quizzes - RF CafeAll RF Cafe quizzes would make perfect fodder in employment interviews for technicians or engineers - particularly those who are fresh out of school or are relatively new to the work world. Come to think of it, they would make equally excellent study material for the same persons who are going to be interviewed for a job.

Click here for the complete list of RF Cafe Quizzes.
Note: Some material based on books have quoted passages.



RF Cafe Featured Book - Modern Communications Receiver Design and TechnologyThis quiz is based on the information presented in Modern Communications Receiver Design and Technology, by Cornell Drentea. Published by Artech House.
 Note: Some of these books are available as prizes in the monthly RF Cafe Giveaway.



1.  What is the modern version of a "coherer?"

a)  Phase locked loop
b)  Radio receiver/detector
c)  Radio transmitter/exciter
d)  Coherent oscillator



2.  What is the difference between a heterodyne (1) and a superheterodyne (2) receiver?

a)  (1) uses tubes while (2) uses transistors
b)  (1) is direct conversion to 0 Hz while (2) uses an IF frequency prior to conversion to 0 Hz
c)  (1) is low power while (2) is high power
d)  (1) uses a DC supply while (2) uses an AC supply



3.  What is an image frequency?

a)  The reflection of a signal
b)  The anti-reflection of a signal
c)  The frequency generated in the mixer that duplicates the intended signal
d)  The signal on the other side of the LO that will also convert to the same IF as the intended signal



4.  What is a High Probability of Intercept receiver?

a)  One that surveys broad frequency ranges in narrow bandwidth samples at high sensitivity
b)  A statistical model of an ideal receiver type
c)  The mathematical duel of a Low Probability of Intercept receiver
d)  One that uses probability algorithms to extract signals form noise



5.  Why would a double conversion be used instead of a single conversion?

a)  Twice the efficiency
b)  Half the efficiency
c)  Avoiding high level intermodulation spurs from the mixer
d)  PCB space savings due to two mixers in one package



6.  What is the 1 dB compression point of an electronic device?

a)  The power level at which the device gain is reduced by 1 dB from the linear value
b)  The power level at which the device gain is increased by 1 dB from the linear value
c)  The 1 dB gain level
d)  The pressure where silicon or GaAs breaks from compressive forces



7.  What is one of the main reasons for using a fractional-N phase-locked loop (PLL) synthesizer?

a)  Higher power levels can be tolerated
b)  Small frequency steps can be obtained without using multiple PLL loops
c)  More readily available parts
d)  None of the above



8.  What type of diode usually makes the best RF signal switch?

a)  Schottky
b)  Zener
c)  Varactor
d)  PIN



9.  Why would you use a logarithmic amplifier (log amp)

a)  If you need to convert from linear units to decibels
b)  If you are only amplifying very small signals
c)  If you are only amplifying very large signals
d)  If you must accommodate a large dynamic range at the input while producing a smaller dynamic range at the output



10.  What is(are) the main difference(s) between an infinite impulse response (IIR) filter and a finite response response (FIR ) filter?

a)  An IIR represents "real" analog filters whereas an FIR does not
b)  An IIR can be unstable while an FIR is always stable
c)  An IIR filter uses feedback while a FIR filter does not
d)  All the above



 

Need some help? Click here for the answers and explanations.

ERZIA (RF amplifiers, wireless, communications) - RF Cafe Triad RF Systems
Rohde & Schwarz USA (RF Component Pocket Guide) - RF Cafe Res-Net Microwave - RF Cafe
About RF Cafe
Kirt Blattenberger - RF Cafe Webmaster
Copyright: 1996 - 2018
Webmaster:
    Kirt Blattenberger,
    BSEE - KB3UON

RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling 2 MB. Its primary purpose was to provide me with ready access to commonly needed formulas and reference material while performing my work as an RF system and circuit design engineer. The Internet was still largely an unknown entity at the time and not much was available in the form of WYSIWYG ...

All trademarks, copyrights, patents, and other rights of ownership to images and text used on the RF Cafe website are hereby acknowledged.

My Hobby Website:  AirplanesAndRockets.com

spacer