1. Mixer output frequency in FMCW RADAR receive chain, exact value (Interviewer is an Ambi/Apparichitudu, PhD drop-out), he expects I should have by-hearted the value 2. Why BPF is used ahead of mixer, he don't want the answer like to filter desired range of frequency, he just wants the answer to be memorized. 3. With and without BPF usage before mixer: how further processing will happen (he prepared some Q&As the day-before, if the answer is not as in his sheet, he will give the reply, "you don't know this" with rubbish slang) 4. Difference between FIR and IIR, he don't want the answer to be as given in text book or any internet source, he wants an answer only a mental can understand. 5. DTFT and DFT/FFT difference: If you given answer like frequency for DTFT is continuous and ranges from -pi-pi or 0-2pi (periodic) and DFT is discrete version ranges from - 0-(N-1), w = 2pi/N * i , he will comment like from where you have by-hearted this 6. DFT and FFT difference: If you answer FFT is efficient computation of DFT, then he will shout at you where you have by-hearted (According to him, he wants a idiot like him who should be useless) 7. He will ask a question related to your previous experience and say you are very poor Finally, he will conclude by saying that one year old fresh BTECH candidate under him is far better me. I think then, he can work in abroad, why the hell he is working here.