Answer Posted / munish kumar

Zener diode is used as a voltage regulator because it is
specially designed,heavily doped Si or Ge diode.We cannot
use "Normal semicondutor diodes" as voltage regulator
because they only conducts in forward bias region and acts
as open circuit (nearly) in reverse bias condition.

Since Zener is heavily doped,so its
depletion layer width is also very thin in reverse bias
condition as compared to normal diodes.

What are the functions of base station system (bss)?

1147

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can any one send me previous ntpc exam papers at garima.12g@gmail.com?

2131

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What is meant by step-down cyclo-converters?

1092

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10 bit A/D converters,the quantization error in % is??

4803

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Plot the pixel histogram( take any image) – count of values versus pixel intensity 0 to 255. You must write this from first principles – do not use the MATLAB hist command (although you may use it for comparison and checking your algorithm’s correctness). Plot the cumulative histogram. Do not use the cumsum function in MATLAB (write your own function to achieve this).

2080

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Define what are the main purposes for which a cc amplifier may be used.

1128

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Explain full duplex and half duplex.

1023

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What is tunneling?

998

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please send the model written test papers to pandu476@rediffmail.com for ET

2234

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Define fan-in and fan-out?

1009

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interface an 8-pin switch with 8085 microprocessor located at 0AAH and LEDs at port 55H, draw the circuit diagram. Write down a program to read the switches and do the following: > if the parity of the switch is odd, start counting upward until it reaches 0FFH. > if the parity of the switch is even, start counting downwards until it reaches 00H.

3258

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Differentiate semiconductors, conductors and insulators on the basis of band gap.

1012

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What is meant by CDOT in relation to the Communication in BSNL? Explain the term CDOT.

2574

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Explain the difference between latches and flip flop?

974

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1 *2 1*3 *2*4 1*3*5 *2*4*6

1787

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