RF Cafe Software

RF Cascade Workbook 2005 - RF Cafe
RF Cascade Workbook

Calculator Workbook
RF Workbench
Smith Chart™ for Visio
Smith Chart™ for Excel
RF & EE Symbols Word
RF Stencils for Visio

About RF Cafe

Kirt Blattenberger - RF Cafe WebmasterCopyright
1996 - 2016
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

Try Using SEARCH
to Find What You Need. 
There are 1,000s of Pages Indexed on RF Cafe !

Electronics World Cover,TOC,and list of posted Popular Electronics articles QST Radio & TV News Radio-Craft Radio-Electronics Short Wave Craft Wireless World About RF Cafe RF Cafe Homepage RF Cafe in Morse Code Google Search of RF Cafe website Sitemap Electronics Equations Mathematics Equations Equations physics Manufacturers & distributors Engineer Jobs Twitter LinkedIn Crosswords Engineering Humor Kirt's Cogitations Engineering Event Calendar RF Engineering Quizzes AN/MPN-14 Radar 5CCG Notable Quotes App Notes Calculators Education Magazines Software,T-Shirts,Coffee Mugs Articles - submitted by RF Cafe visitors Simulators Technical Writings RF Cafe Archives Test Notes RF Cascade Workbook RF Stencils for Visio Shapes for Word Thank you for visiting RF Cafe!

General RF/Microwave Electronics
RF Cafe Quiz #3(Title)

All RF Cafe quizzes would make perfect fodder for 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: Many answers contain passages quoted in whole or in part from the text.

 

 

1. What is a primary advantage to using 90° (quadrature) hybrid couplers in amplifier designs?

a) Wider bandwidth possible
b) Low noise figure
c) Input/output impedance not dependent on devices as long as device impedances are equal

 

 


2. Why is there a frequency term in the equation for free-space path loss?

a) There is no frequency term
b) Atmospheric absorption
c) Antenna geometry requires it

 

 


3. If an amplifier has a noise temperature of 60K, what is its noise figure for an ambient
    temperature of 290K?

a) 8.0 dB
b) 80 dB
c) 0.82 dB

 

 


4. What is a primary advantage of offset-quadrature-phase-shift-keying (OQPSK)
    over standard QPSK?

a) Greater data rates possible
b) Greater spectral efficiency
c) More constant envelope power

 

 


5. A mixer has the following input frequencies:  RF = 800 MHz, LO = 870 MHz. The desired output
   frequency is 70 MHz. What is the image frequency?

a) 940 MHz
b) 1670 MHz
c) 140 MHz

 

 


6. What is the spurious-free dynamic range of a system with IP3 = +30 dBm and a minimum
    discernible signal (MDS) level of -90 dBm?

a) 80 dB
b) 120 dB
c) 60 dB

 

 


7. A spectrum analyzer displays a component at 10 MHz @ 0 dBm, 30 MHz @ -10 dBm, 50 MHz @ -14 dBm, 70 MHz @ -17 dBm, and all of the other odd harmonics until they disappear into the noise. What was the most likely input signal that caused the spectrum?

a) A 10 MHz square wave (0 Vdc bias)
b) A 10 MHz triangle wave (0 Vdc bias)
c) A 10 MHz cosine wave (0 Vdc bias)

 

 


8. On which side of a rectangular waveguide is an E-bend made?

a) The long dimension
b) The short dimension
c) The inside

 

 


9. During a network analyzer calibration, why are both a short circuit and an open circuit used?

a) They average to 50 ohms in an RF system
b) To determine the characteristic impedance of the measurement system
c) Both are easy to produce to at high accuracy

 

 


10. What is the first harmonic of 1 GHz?

a) 1 GHz
b) 2 GHz
c) 10 GHz

 

 

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