Interview Questions- MBA Admissions- Job Interviews
- Electronics and Communication, Applied Electronics
• What is Yagi-Uda antenna ?
A Yagi-Uda antenna is familiar as the commonest kind of terrestrial TV antenna to be found on the rooftops of houses. It is usually used at frequencies between about 30MHz and 3GHz, or a wavelength range of 10 metres to 10 cm
• What is difference between Piconet and Scatternet ?
"A piconet is the type of connection that is formed between two or more Bluetooth-enabled devices, one device takes the role of 'master', and all other devices assume a 'slave' role for synchronization reasons. Where as a scatternet is a number of interconnected piconets that supports communication between more than 8 devices. Scatternets can be formed when a member of one piconet (either the master or one of the slaves) elects to participate as a slave in a second, separate piconet."
• What is MIMO ?
MIMO- multiple-input and multiple-output, , is the use of multiple antennas at both the transmitter and receiver to improve communication performance. It is one of several forms of smart antenna technology.
• What is VOIP ?
Voice over Internet Protocol (Voice over IP, VoIP) is one of a family of internet technologies, communication protocols, and transmission technologies for delivery of voice communications and multimedia sessions over Internet Protocol (IP) networks, such as the Internet.
• What is EDFA ?
Erbium-doped fiber amplifier. EDFA is an optical repeater device that is used to boost the intensity of optical signals being carried through a fiber optic communications system.
• what do you understand by microwaves? why these are called micro
Micro waves are those waves whose wavelength is less than 30 cms or freq ranging from 1 GHz to 1000 GHz.
• How do microwave oven works??
The main component of microwave oven is magnatron which generates frequency of appox. 2.4 GHz.
• What do you mean by 3 dB cutoff frequency? Why is it 3 dB, not 1 dB?
3dB is the half power value
• What is 2G?
2G is short for second generation wireless telephone technology.It is actually an upgradation of 1G which was analog in nature..but 2G is digital in nature..moreover its penetration in mobile networks is much higher.
• What is 3G?
3G is short for 3rd generation wireless telephone technology. It is a further upgradation of 2G..its data rates are higher and it is supposed to be ranged upto 14 mbps. NTT Docomo of Japan used it first. (After this u may expect questions from Docomo,so i u r aware use this statement)
Many new applications like Mobile TV,Internet Browsing, Video Conf,Tele-Medicine can be used.
• what is 4G?
4th Generation technology. Have very high data rates upto 100Mbps. and can be used for Online Gaming, HDTV viewing,etc..
• Why are video signals amplitude modulated and sound signal frequency modulated in composite video signal.?
Both picture and sound signals from different stations are concentrated within the same range of frequencies. Therefore, radiation from different stations would be hopelessly and inextricably mixed up and it would be impossible to separate one from the other at the receiving end. Thus
in order to be able to separate the intelligence from different stations, it is necessary to translate them all to different portions of the electromagnetic spectrum depending on the carrier frequency assigned to each station. Also the sound signal is frequency modulated because of its inherent merits of interference-free reception.
