Telecommunication Objective Questions with answers, UVH,VHF,LED,LCD

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Telecommunication Objective Questions with answers, UVH,VHF,LED,LCD are given in this post.

Telecommunication Objective Questions


TELECOMMUNICATION


Wireless radio communication was developed by

Ans : Guglielmo Marconi


First telecommunication device was

Ans : Telegraph


The frequencies transmitted by TV station is called

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Ans : Channel


For radio transmission BBC uses

Ans : Short waves


Short waves ranging  from 14m to 60m are used for

Ans : International communication


The waves which travel long distances without loss in intensity

Ans : Short waves (14m to 60m)


Short waves ranging from 14m to 60m are used for

Ans : International communication


The waves which travel long distance without loss in intensity

Ans : Short waves (14m to 60m)

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VERY HIGH FREQUENCY (VHF)


Electro magnetic spectrum between 30MHz and 300 MHz is called

Ans:VHF

VHF is used in

Ans:Radio Transmission and Radar

ULTRA HIGH FREQUENCY (UHF) 


Frequency ranging from 300 MHZ to 3GHz is called

Ans : UHF

UHF is used in 

Ans : Ratio Transmission and Radar

ULTRA HIGH FREQUENCY


Frequency ranging from 300MHZ to 3GHz is called

Ans : UHF

UHF is used in

Ans : T.V, Communication of satellite etc.

Telex

Ans : Teleprinter Exchange

The device used for communicating the text and images through telephone lines

Ans : Fax machine

The device used to convert audio frequency signals into sound

Ans : Loudspeaker

The instrument which has ability to convert sound into magnetic energy

Ans : Tape recorder

LCD AND LED


LCD – Liquid Crystal Display  

LED – Light Emitting Diode

LED is used as monitor, clocks, watches, calculators, telephones etc.

LED was invented by

Ans : Oleg Losev and Nick Holonyak

Working principle of LED 

Ans : Electroluminescence

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