Thursday, October 18, 2012


What do you mean by 3 dB cutoff frequency? Why is it 3 dB, not 1 dB?
What is the need for modulation?
What is EDFA ?

What is meant by pre-emphasis and de-emphasis?

What is Race-around problem? How can you rectify it?

What is CMRR? Explain briefly.

Difference between FM and AM, which is preferred & its advantages. 

For asynchronous transmission, is it necessary to supply some 
synchronizing pulses additionally or to supply or to supply start and 
stop bit?

Questions on signal processing techniques ? 

What is VOIP ?

On what principle do Transformers work ?

BPFSK is more efficient than BFSK in presence of noise. Why?

What is ZigBee and its specifications ?

Questions on different coding techniques ?

What is latest satellite from ISOR ?

What is impulse response?

Why we use vestigial side band (VSB-C3F) transmission for picture?

What are the different types of filters?

What are different types of antennas ?

What is Moore's Law ?

What is Lenz law ? 
Explain the advantages and disadvantages of FIR filters compared to IIR counterparts.
  What is sampling theorem?
How can you convert an SR Flip-flop to a JK Flip-flop?

What is Transmission Frequency of Bluetooth, Wi-Fi and Wi-MAX ?

Why is Zener Diode always used in Reverse Bias condition ? 

When transmitting digital signals is it necessary to transmit some 
harmonics in addition to fundamental frequency?

What do you mean by an ideal voltage source?

What is Yagi-Uda antenna ?

What is a multiplexer?

What is the basic difference between Latches and Flip flops?

Which type of modulation is used in TV transmission?

What is FPGA ?

What is meant by D-FF?

How many satellites comprise the GPS and expand it ? 

What is difference between Piconet and Scatternet ?

What is the need of filtering ideal response of filters and actual response of filters?

What is RS in RS-232 ?

Which range of signals are used for terrestrial transmission?

What do you mean by ASCII, EBCDIC?

What is MIMO ?

What do you mean by zener breakdown and avalanche breakdown?

Which semiconductor device is used as a voltage regulator and why?
How can you convert an JK Flip-flop to a D Flip-flop?

What is difference between Microprocessor and Microcontroller ?

What do you mean by half-duplex and full-duplex communication? 
Explain briefly.

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