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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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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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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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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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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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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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Binary Data Sequence
In a binary data sequence, the duration of symbol 0 or 1 is 1ms. If a carrier of freq 4khz is used in ASK, What is the minimum transmission bandwidth required? What is min bandwidth?
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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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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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Negative Logic
What is the equivalent of negative logic AND gate?
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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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Q-METER
Q-Meter works on which principal?
kapilgupta.mnit
- Mar 10th, 2010
A direct-reading instrument which measures the Q of an electric circuit at radio frequencies by determining the ratio of inductance to resistance, and which has also been developed to measure many other quantities. Also known as quality-factor meter.
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What is the difference between Circuit Switching and Packet Switching?
jiya bhatia
- Jan 26th, 2010
Circuit switching is a transmission technique which is connection oriented. Connection has to be established before the actual data transmission takes place. While packet switching is connection less. The data is transmitted in the form packets one after other.
sukisudha
- Nov 13th, 2007
Circuit switching is the transmission technology that has been used since the first communication networks in the nineteenth century. In circuit switching, a caller must first establish a connection t...
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The Cost of storing a bit is minimum in 1. Cache 2. Register 3. RAM 4. Magnetic tape
anil
- Sep 5th, 2007
Magnetic Tape
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Breaker Capacity
Why making capacity of the circuit breaker is higher than breaking capacity?
rajashekharreddy
- Dec 4th, 2009
Making capacity is the max fault current it can carry during closing of breaker, e.g. You are closing a breaker on fault. The making capacity is always higher because it is expressed in peak value not rms, and also because of the DC offset, voltage and PF while closing
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Signal Processing
Why do we convert Frequency Domain to Laplace Domain?
RZara
- Nov 24th, 2009
Frequency domain ----> deals with jw Laplace domain ----> deals with s, but s = (sigma) + ( jw )so with sigma = 0, laplace domain and frequency domain are the same. We convert time domain to eit...
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Ripple counter using edge-triggered JK flip-flop
In a ripple counter using edge-triggered JK flip-flop. the pulse input is applied to the 1. clock input of oll flip-flops 2. clock input of one flip-flop 3. J and K input of one flip-flop 4. J and K input of all flip-flops
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Satellite Communication
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Mod-N counter
How can we identify how many states the ripple counter is having by looking at the figure as it can also have some invalid states?
RZara
- Nov 24th, 2009
If in the ripple counter, there are 3 flip flops, it is a mod-8 counter which counts from 0-7(binary). If additional circuitry is used, then it is a counter where few states have been trapped. Usually...
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