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RF Cafe Quiz #46

RF Engineering Quizzes - RF CafeAll RF Cafe Quizzes make great 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. Bonne chance, Viel Glück, がんばろう, buena suerte, удачи, in bocca al lupo, 행운을 빕니다, ádh mór, בהצלחה, lykke til, 祝你好運. Well, you know what I mean: Good luck!

Click here for the complete list of RF Cafe Quizzes.

Note: Some material based on books have quoted passages.

 

Handbook of RF, Microwave, and Millimeter-Wave Components - RF Cafe Featured BookThis quiz is based on the information presented in Handbook of RF, Microwave, and Millimeter-Wave Components, by Sergey M. Smolskiy, Leonid A. Belov, and Victor N. Kochemasov.

 

 

Transfer switch schematic symbol - RF Cafe

1.  What type of switch is shown to the right?

a)  Fail-safe switch

b)  4-pole-4-throw switch

c)  Transfer switch

d)  Normally open switch

 

 

2.  What is an adapto-attenuator?

a)  Combination connector between-series adaptor and an attenuator

b)  An attenuator manufactured by the Adapto company

c)  An adaptable/variable attenuator

d)  A device for adapting attenuators

 

 

3.  What do we call the difference in decibels of the power output at a coupled port, when power is transmitted in the desired direction, to the power output at the same coupled port when power is transmitted in the opposite direction?

a)  Directivity

b)  Coupling

c)  VSWR

d)  Sensitivity

 

 

4.  What is the main use of a circulator?

a)  To circularly polarize the signal

b)  To separate the I and Q signal components

c)  To omnidirectionally direct signals from one port specifically to another

d)  To unidirectionally direct signals from one port specifically to another

 

 

5.  What is a lumped element element filter?

a)  A filter constructed of distributed elements

b)  A filter constructed of standard wire-wound inductors and parallel plate capacitors

c)  A filter approximation for mathematical modeling

d)  No such thing

 

 

6.  What is a very desirable feature of a YIG (yttrium-iron garnet) filter?

a)  High Q factor

b)  Electrically tunable over a wide bandwidth

c)  High frequencies

d)  All the above

 

 

Wikipedia Creative Commons Image, 16QAM - RF Cafe7.  What does the image to the right represent?

a)  4-QAM constellation

b)  16-QAM constellation

c)  Quad-quad constellation

d)  Dominoes

 

 

8.  In which operational region of an amplifier is its1 dB compression point?

a)  Low frequency region

b)  High frequency region

c)  Linear region

d)  Nonlinear region

 

 

9.  What is an image rejection mixer?

a)  A mixer that prevents the image frequency from appearing at the output

b)  A mixer that prevents the negative frequency from appearing at the output

c)  A mixer that prevents the upper sideband from appearing at the output

d)  A mixer that prevents the lower sideband from appearing at the output

 

 

10.  What are the main electrical characteristics of a reference oscillator?

a)  Package size, material (aluminum, steel, molybdenum, etc.), and weight

b)  Connector type, input voltage, control signal pinout

c)  Both a) and b)

d)  Center frequency, stability, phase noise, harmonics, output power

 

 

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

Quizzes from vintage electronics magazines such as Popular Electronics, Electronics-World, QST, and Radio News were published over the years - some really simple and others not so simple. Robert P. Balin created most of the quizzes for Popular Electronics. This is a listing of all I have posted thus far.

RF Cafe Quizzes

Vintage Electronics Magazine Quizzes

Vintage Electronics Magazine Quizzes

 

 

Posted September 9, 2020
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About RF Cafe

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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 World Wide Web (Internet) was largely an unknown entity at the time and bandwidth was a scarce commodity. Dial-up modems blazed along at 14.4 kbps while tying up your telephone line, and a nice lady's voice announced "You've Got Mail" when a new message arrived...

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