- Technical Blog From My Notebook

Thursday, February 21, 2019

Objective Questions on Basic Electronics- Semiconductor, Integrated Circuits, Logic Gates



Objective Questions on Basic Electronics- Semiconductor, Integrated Circuits, Logic Gates


ELECTRONICS


The study of nature, control and application of electrons
Ans : Electronics
Vacuum tubes work on the principle of 
Ans : Thermionic emission 
The simplest form of a vacuum tube 
Ans : Diode
The device used to convert alternating current (AC) to Direct Current (DC) 
Ans : Rectifiers 
The device which converts DC energy into AC energy
Ans : Electronic oscillator 
The process which makes the current to pass in the same direction is called 
Ans : Rectification
Now thermionic valves are completely replaced by
Ans : Transistors
Miracle child of electronics 
Ans : Transistor 
Triode was invented by 
Ans : Lee De Forest 
Element used in solar cells 
Ans : Silicon


SEMI CONDUCTORS


Materials whose conductivity lies between conductors and insulators
Ans : Semi conductors
Examples of semiconductors are
Ans : Germanium, Silicon
Semi conductor in pure state is called
Ans : Intrinsic Semiconductors
In intrinsic, number of holes is equal to number of
Ans : Electrons
The process to improve conductivity 
Ans : Doping
Process of adding controlled impurities to a pure semiconductor is known as 
Ans : Doping
The substances used for doping 
Ans : Dopants
An intrinsic semiconductor undergoes doping, change into
Ans : Extrinsic semiconductor 
Extrinsic are of two types:
(1)N-type semiconductor
(2)P-type semiconductor In N-type, charge carriers are
Ans : Electrons
An intrinsic semiconductors have
Trivalent impurity (eg: Boron, Gallium)
Pentavalent impurity (eg: Antimony, Arsenic)


SEMI CONDUCTORS ARE USED MAINLY IN


Solar cells (silicon)    transistors
diodes    Integrated circuits (IC)


DIODE


The electronic device which has semiconducting property that allows current to flow in one direction 
Ans : Diode
Diode is mostly used to convert 
Ans : AC to DC 
Diode is used as a 
Ans : Rectifier
Zener diode is used as 
Ans : Voltage regulator


TRANSISTOR


A semiconductor device used to amplify or switch electronic signals and electrical power
Ans : Transistor
Transistor is operated at low temperatures and voltages.
Three regions of a transistor
Ans : Emitter, Base, Collector 
Transistor transfers a signal from a low resistance to
Ans : High resistance 
Transistor was invented by
Ans : John Bardeen, W.H. Brattain and William Shockley 
Electronic intelligene is called 
Ans : ELINT


INTEGRATED CIRCUITS (IC)


The circuits that act as transistors, diodes, resistors etc is called
Ans : Integrated Circuits 
'IC' chips are made up of
Ans : Silicon or Germanium 
IC was invented by 
Ans : Jack Kilby
IC chip using Silicon was invented by 
Ans : Robert Noyce


GATES


The electronic circuit which works only on two voltage levels (0 and 1) is called 
Ans : Gates


LOGIC GATES ARE


1. AND Gate 
2. OR Gate 
3. NOT gate
Universal logics are - NAND, NOR
Voltage levels In a circuit is either represented by
Ans : '1' or '0'
The level '1' represents
Ans : High voltage level
The level '0' represents
Ans : Zero voltage level

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