Question { Infosys, 28524 }

what are the different types of Protocols? & their applications.

Answer

A Protocol is basically a convention of standard which
controls the connection and the connections and data
transfers associated with it. It governs the syntax,
semantics and synchronization used in computing.

There are a number of protocols used in computing. The most
popular ones being the following:

Telnet (Telnet Remote Protocol)
SSH (Secure Shell Remote Protocol)
IP (Internet Protocol)
UDP (User Datagram Protocol)
TCP (Transmission Control Protocol)
DHCP (Dynamic Host Configuration Protocol)
HTTP (Hypertext Transfer Protocol)
FTP (File Transfer Protocol)
POP3 (Post Office Protocol 3)
SMTP (Simple Mail Transfer Protocol)
IMAP (Internet Message Access Protocol)

Question { 4989 }

A motor is taking 15 Amps at no load and 60 Amps at full load.
and a valve has to open 10% at full load and 80% at no load.
How to draw ladder logic.(PLC).

Answer

YOU NEED A CURRENT TRANSDUCER AT YOUR MCC WHICH CAN GIVE YOU
THE 4-20mA SIGNAL WITH 0 TO 70Amps. proportionally.
USE LESS THAN & GREATER THAN BLOCK LOGIC FOR OPEN & CLOSE
THE VALVE.

Question { PPL, 6450 }

what is difference b/w Earth and ground

Answer

As per IS 3043-1987, vide Cl. 0.7, the terms
‘earthing’ and ‘grounding’ are synonymous.
Perhaps the different nomenclature is due to the
usual conflicting usage of English language
between the Americans & the British. While the
British termed it as ‘earthing’, the Americans
termed it as ‘grounding’. IEC & IS Standards refer
as ‘earthing’, while IEEE & ANSI Standards refer
as ‘grounding’.