Interview Questions- MBA Admissions- Job Interviews
- Electronics and Communication, Applied Electronics
• What is the basic difference between Latches and Flip flops?
latches cannot store any information, while Flipflops can
• Difference between GSM and CDMA technology?
CDMA uses same frequency for a number of signals. This is possible because of Analog to digital conversion and then encoded with a random signal. Then decoded at the receiving end using decoding algorithem. Hence lot of ppl can talk wiht out interference...Weere as GSM, the no. of ppl who can share a particular freq is limited. Specturm is divided in frequency and then time slots are allotted....for callers... :Due to spectrum constraints, CDMA which needs less spectrum for the same number of calls, has advantage over GSM. And it's less costly to set up as well.
• What is ZigBee and its specifications ?
"ZigBee is a specification for a suite of high level communication protocols using small, low-power digital radios based on the IEEE 802.15.4-2003 standard for Low-Rate Wireless Personal Area Networks (LR-WPANs), such as wireless light switches with lamps, electrical meters with in-home-displays, consumer electronics equipment via short-range radio. ZigBee is targeted at radio-frequency (RF) applications that require a low data rate, long battery life, and secure networking.
• What is FPGA ?
Field-programmable Gate Array (FPGA)- is an integrated circuit designed to be configured by the customer or designer after manufacturing—hence "field-programmable". The FPGA configuration is specified using hardware description language (HDL).FPGAs contain programmable logic components called "logic blocks",
• What are semiconductor devices
A semiconductor device is a device which has a pn junction in it.Ex. Diode, transistor.Basically they are different in conduction property. these materials are not conductors by default they become conductors in some cicumstances like, increase in temperature or difference in the charge density, etc.Germanium and silicon are the best examples of semiconductors
• Why the input resistance of an op-amp is high whereas it's output resistance is low?
Op-Amp has to provide maximum output and haence has low output resistance , for loading at the input point its has high resistance in the input side.
• What is CMRR? Explain briefly.
CMRR stands for common mode rejection ratio. It is a measure of the ability of a test instrument to reject interference that is common to both of its measurement input terminals. It is expressed in decibels and it is the ratio of the actual or common signal level appearing on the two input terminals together to the measured level.
• What is a tunnel diode ?
Tunnel diode was invented by Esaki and its different from the normal diode in terms of the doping concentration as in 1part of doping is present in 10^3 atoms whereas in normal diode it is 1 part in 10^8 atoms. It is basically used for very fast switching response.
• What do you mean by ASCII, EBCDIC?
ASCII (American Standard Code for Information Interchange), is a character encoding based on the English alphabet. EBCDIC (Extended Binary Coded Decimal Interchange Code) is an 8-bit character encoding used on IBM mainframe operating systems"
