Answer / ripul ghosh

nowadays 24V DC relays are used compared to 230V what was used before..relays are mainly there to isolate the controller from high power lines,
The signal from the controller will come to the relay and it will get energised to drive the output load.

Answer / nirmalya basu

to energise a output by plc and for its protection purpose
also.

Answer / ganesh

the relay works with AC and DC.
it provide the isolation between controller and devices works on ac and dc.
it is extremely useful when you need to control a large amount of current or voltage with small electrical signal.

Answer / suresh agravat

Example pressure transmitter input showing fiied full with liquid than send singnal through output to relay. When relay deenergised motor contactor not get supply and it will be motor or pump stop. Relay is basically on/off switch

Name different parts of a pressure gauge. Explain the use of hair spring in the pressure gauge.

0 Answers  

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relation between level and differential pressure.

3 Answers  

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give me the formula for analog to digital converter and also d to a converter

0 Answers   ACC,

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What is the basic difference between Modbus and CAN Open Protocols

0 Answers  

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What are the types of control valves available

0 Answers   CCIE,

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how can check the loopchecking for valves?

3 Answers  

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why we use cascade control and feed forward control in 3 element drum level control measurement of steam drum .what is cascade and feed forward control system ?give example .

0 Answers   Visa Steel,

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Explain what is meant by the term “FLASH POINT” of liquid?

2 Answers  

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why do we use 4-20 ma current why cant o-20ma

6 Answers   Southwest Cheese,

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what is your eligibility criteria for freashers?

0 Answers   Satyam,

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Which of the following instruments consumes maximum power during measurement?

3 Answers  

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Why is a dead weight tester so called by that name?

1 Answers   SGS,

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