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TV Aspect Ratio
Why the aspect ratio of TV video display is 4:3 or 16:9? Why not it is any other?
kumar praveen bodu
- Mar 23rd, 2010
In TV it is conviniance to appear the object in horizontal manner, so it is better to fix the horizontal lengh more than vertical. 4:3 and 16:9 are the suitable lengths for human naked eye.
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Negative Logic
What is the equivalent of negative logic AND gate?
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IC Basics
The function of a transistor used in any of the ICs is to perform SWITCHING action and not AMPLIFICATION.Then why DIODES are not used instead of TRANSISTORS as diodes also exhibit the same switching action?
Bill_O
- May 7th, 2010
I agree Digital ICs use transistors as switches. But Analog (Linear) ICs Do Use transistors as Amplifiers. Consider the differential pair of transistors that form the front end of an op amp.&nbs...
pc1009
- Apr 15th, 2010
There is Control in diode as a result of which the power consumption will be very high
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LED's for Rectification
Why cannot we use LED's for rectification purpose?Can we get light when the circuit is working?
maxandrean
- Jul 5th, 2010
LED is not designed for resctifier purpose, even though theoritically it can be use, but the nature of the current flow capacity of LED is not suitable to be used as reactifier. LED works in micro Amp...
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Transducer and Transponder
What is Transponder? Give the difference between Transducer and Transponder.
Manish01singh
- Aug 7th, 2010
TRANSDUCER: A transducer is a device that convert one form of energy into other form of energy.??TRANSPONDER: A transponder is a combination of transmitter+receiver. it receives the weak incoming signal, amplifies it and again transmit the signal. It is mainly used in satellite communication.?
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Measure Frequency
How we can measure frequency without CRO ?
vasanthmadhu
- Aug 12th, 2010
We can also measure frequency by Frequency meter and frequency analyzer.Please check it out.
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Value of Binary Number with n Digit
What is the Value of binary number with n digit, all of which are unity?a) 2 to the power nb) 2 to the power (n-1)c) (n square) - 1d) (2 to the power n) - 1
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Landline Telephone Voltage
At what voltage does landline telephone operate?
Mayank19
- Aug 29th, 2010
I tried to measure ring voltage, and showed inside the house 34V A/C, but measuring at the NID seems to show 10V? and change. Maybe caller-ID messes up the signal? Line is -51V DC. DSL is on the same line and is perfect 6016/768 and call quality is clean.
kotiannireeksha
- Aug 3rd, 2010
The normal telephone system works on -48vDC on hook when the phone goes off hook, the voltage drops to about 10v but reverses polarity.
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SIM Shape
Why does all cellular networks have same shape of SIM? Why is it designed in such a particular shape? Does it have any other shape?
saptadeep
- Aug 30th, 2010
All SIM are of same shape because cellular phones when manufactured in industries, didn't know that which SIM the customer is going to use. It has to be universal so that the cellular phones can be used with any network connection SIM.
Mayank19
- Aug 29th, 2010
Certain standards are followed by all electronic manufacturers and the same applies to cellular technology.
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Knee Point Voltage
How to calculate knee point voltage? Describe its purpose for differential protection.
vikash798
- Sep 3rd, 2010
10 % increase in voltage gives you 50 % increase in excitation current is called knee point voltage. To measure this first demagnetise the CT and apply voltage gradually from secondary keeping primary winding open circuited. while doing this above phenomeneo will be observed.
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Aviation Industry Radio Transmission Frequency
Why is 400 Hz used for flight instruments and Radio Transmission System in Aviation Industry universally?
lakshmyranjith
- Sep 5th, 2010
You need some sort of AC for power transmission and distribution inside of aircraft. Power companies use 50/60Hz because any higher frequency results in excessive inductive and capacitive losses, give...
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DVST monitor
A DVST monitor 1. cannot display colour 2. can display 4 colour 3. can display 3 colour 4. can display many colour
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What is selective flooding?
harshil102
- Sep 27th, 2010
Flooding most often occurs when a large enough number of packets (the droplets in a stream of data) are flowing through the network that regular data cannot be sent in a normal speed and fashion. Ge...
shashi.srm
- Jun 28th, 2010
It is a technique used for sending packets of data to selected group of person and is not sent to all users as in case of flooding.
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MOSFET Pinch Off Voltage
In a MOSFET, What does the pinch off voltage refers to?
Sagar21p
- Oct 7th, 2010
Pinch off voltage is the excess voltage Vds applied which limits the current flowing into drain.. at that point the current saturates...and the o/p current remains constant.
kumar praveen bodu
- Mar 23rd, 2010
Pinch-off voltage refers to the maximum gate current applied to MOSFET to increase the depletion layer between source and drain.
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Area of Collecter
We take the area of collecter wide comparision to base and emitter. Why?
himanshu.3375
- Oct 22nd, 2010
Its area is kept more to collect the maximum number of electrons transmitted.
Ranveer Upadhyay
- Oct 3rd, 2010
if u think over that then we use collecter in reverse bias n emitter in forward bias.in reverse bias minority carriers r responsible for conduction. if the area of collector is not more than emi...
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BJT Device
Why BJT is called current control device?
nikram.aptil76
- Oct 23rd, 2010
As the output of the BJT is controlled by the base current of the transister
engr.hayee
- Sep 1st, 2010
Because the small current (Base current) is controlling large current (collector current).
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Satellite Communication Frequency Range
What is the frequency range of satellite communication?
shikha khaneja
- Oct 29th, 2010
Satellite mainly works in c band(4-8GHz) or KU band(12-18GHz) and these are mainly for the downlink.
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What is the difference between latches and flip flop
ajeebj
- May 22nd, 2008
Latches are level sensitive devices where as Flipflops are edge sensitive device
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Device Frequence
How will you determine what frequency the device has without using oscilloscope?
Er.Anju
- Dec 21st, 2010
The frequency of a device can also be calculated by the method below:- Speed of light (c) =299,792,458 m/s. Planck constant (h) =4.13566733E'15 eV s (1E-15 denotes "10 in power -15") Frequency(Hz) = ...
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Excitation Table
What is the use of excitation table in digital electronics?
vinit.slim.shady
- Jan 10th, 2011
Excitation table is required when we want to design a state machine from the truth table of any of the flip flops used.
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