electricalengineeringquestionanswer

Q.Define combinational logic  When  logic  gates  are  connected  together  to  produce a  specified  output  for  certain  specified combinations of  input  variables,  with no  storage  involved, the  resulting  circuit is  called combinational logic.  Q. Define Half adder and full adder  The logic circuit that performs the addition of two bits is a half adder. The circuit that  performs the addition of three bits is a full adder.  Q. Define Decoder  A decoder is a multiple - input multiple output logic circuit that converts coded  inputs into coded outputs where the input and output codes are different.  Q. What is binary decoder?   A  decoder  is  a  combinational  circuit  that  converts binary  information  from  n  input  lines to a maximum of  2 n   out puts line...

Q.What is Microprocessor? Give the power supply & clock frequency of 8085  A microprocessor is a multipurpose, programmable logic device that reads  binary  instructions  from  a  storage  device  called  memory  accepts  binary  data  as  input  and  processes  data  according  to  those  instructions  and  provides  result  as  output. The power supply of 8085 is +5V and clock frequency in 3MHz.  Q. List few applications of microprocessor-based system.  It is used:  i. For  measurements,  display  and  control  of  current,  voltage,  temperature, pressure, etc.  ii.  For traffic control and industrial tool control.  iii.  For speed control of machines.  Q. What are the functions of an accumulator?  The  accumulator  is  the  register  associate...

Q.What are semiconductors? The materials whose electrical property lies between those of conductors and insulators  are known as Semiconductors. Ex germanium, silicon. It has two types. 1. Intrinsic semiconductor 2. Extrinsic semiconductor. Q.What is the order of energy gap in a conductor, semi conductor, and  insulator?.  Conductor - no energy gap  Semi Conductor - It is of the order of 1 ev.  Insulator - 6 ev (or) more than 6 ev.  Q. Zener effect and avalanche effect are the two possible break down mechanisms  that helps the external current . Why ? Zener effect : The electric field in the depletion layer reach a point that it can break the covalent bonds and generate electron–hole pairs.  Avalanche breakdown : The minority carriers that cross the depletion layer  under the influence of the electric field gain sufficient kinetic energy to be able to  break covalent bond in atoms which they collide.  Q.Why does the conductivity of ...