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Rf engineer Interview Questions

Interviews for RF engineering jobs are designed to be heavily technical as well as to inquire about your past experience in radio technology. Employers are looking for strong and intelligent team members to make their communication products stronger and more competitive and will be looking to hire confident individuals with a solid foundation in engineering skills. A bachelor's degree in electrical engineering is expected.

Rf engineer Interview Questions

Rf engineer Interview Questions

Interviews for RF engineering jobs are designed to be heavily technical as well as to inquire about your past experience in radio technology. Employers are looking for strong and intelligent team members to make their communication products stronger and more competitive and will be looking to hire confident individuals with a solid foundation in engineering skills. A bachelor's degree in electrical engineering is expected.

881 Rf Engineer interview questions shared by candidates

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Qualcomm
RF Hardware Engineer was asked...December 1, 2011

What are the effects of a mismatched circuit?

5 Answers

IIP2 & DC Offsets

IN the digital domain, zero crossings and ISI , as well as DC offset can be compromised.Loss of received signal strength with distortion, Overheating and damage to TX drivers Less

Worse is not working.

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C Squared Systems

What is DAS?

2 Answers

"Distributed Antenna System". Allows cellular carriers to extend cell phone coverage in buildings, stadiums, airports, etc. Less

Distrusted Antenna System its for indoors, stadium, venues, and airports.

Nexius

What will be the greatest contribution that you can ever make as an individual to your team

1 Answers

coalescing my individual knowhow with overall experience that my team has makes for a well-rounded team that knows esprit de corps and can work towards success all the times Less

Motorola Mobility
RF Engineer was asked...October 18, 2016

Why 50 ohm, not 75 ohm?

4 Answers

30 ohms gives better power handling, 75 ohms gives low insertion loss, so 50 ohms is the trade off between the power handling and low insertion loss. It is globally accepted to use connector, cables and equipment for 50 ohms. Less

50 ohms performs better (lower loss than 75 ohms), one advantage of 75 ohms is size (cable and connectors are smaller than 50 ohms) Less

Please disregard prior answer, best insertion loss case is at 75 ohms, 50 ohms provides the best compromise between low loss and power handling as mentioned above. Less

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Nokia

Describe basic Call Flow of GSM/UMTS ?

2 Answers

1.) First of all mobile+SIM should be detected by mobile station. 2.) Then it passes the signal to BTS of the area, (which is occured in BSS). 3.) Then it passes to the neareast MSC by this it is connected to HLR,VLR,AUC & OMC, (which is occur in NSS). 4.) from this it is connected to PSTN,ISDN,DATA NETWORK(this all is occur in public network) Less

Kindly refer notes from any book, call flow cant be explained in this block.

Qualcomm

During lunch, I was given a problem on how I would optimizing the traffic at the access point used at the cafeteria, we discussed about it during the entire time allotted for lunch

3 Answers

Think out loud, it was more of a general discussion than a question-answer session. The interviewer was very helpful too. Less

Hi, DId they inform about you being rejected? When did you interview happened? It will be of great help if you can answer these!! :) Less

Hello sir, can you tell me how many days it took for a onsite interview after your phone process, I already had a interview with software team and waiting for results. Less

Qualcomm

Reverse a linked list Array and string manipulation

3 Answers

How soon did they get back to you about the result of onsite?

for me it was about a month because there was christmas holiday break. otherwise it should be max 2 weeks. Less

Okay Thank you

SpaceX
RF Engineer was asked...January 28, 2016

Say we are receiving a signal (on Earth, from Space) at the level -174dBm, what is the next step we will do with this signal?

3 Answers

Assuming this is a "front end" of a receiver, the signal would be filtered and then pass through a LNA (Low Noise Amplifier). Less

This might have been your "trick" question. This signal wouldnt be detectable. Even if you reciever is completely ideal with a NF of 0 and your signal of interest is in a 1Hz bandwidth, and your recieved signal is noiseless, your signal to noise ratio will be zero. SNR = P - 10logKTB SNR = -174dbm - (-174dbm/hz + 10log(1hz)) SNR = 0 Less

Go to a really cold place to bring the surrounding noise down (near 0Kelvin ideally). Noise would only come from sky noise which is usually like 35Kelvin. Less

Nokia
RF Engineer was asked...February 28, 2012

what would you do if you're a manager/team leader, and you face the following problem..........

2 Answers

I & my team member try to find the solution of every problem........and give the solution which is appropriate ans of solution Less

I'm not a manager, I couldn't answer that positively, I had to improvise

Apple

2. if VSWR is 2, what is the reflection coefficient?

3 Answers

The magnitude of gamma=1/3, but you can't tell the phase. can be any point on the circle with a gamma=1/3 radius. Less

Gamma=(VSWR-1)/VSWR+1, so 0.333 is the reflection coefficient for VSWR=2

.3333333

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