POWER PLANT INSTRUMENTATION & CONTROL

Browsing Archive: January, 2013

ULTRATECH

Posted by Debyendu Chakraborty on Tuesday, January 15, 2013, In : INTERVIEW QUESTION 
what is the difference between the 2 wire level transmitter and 4 wire level transmitter?

Ans - In case of 4 wire transmitter, 2 wire is used to give power to the transmitter and other 2 wire to transmit the signal. In case of 2 wire , the 2 wire carries the power as well as the signal. Example- 4 to 20 mA is flowing through the 2 wire and according to level the current is changing.
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RENUKA SUGAR LIMITED

Posted by Debyendu Chakraborty on Tuesday, January 15, 2013, In : INTERVIEW QUESTION  
Why would an Engineer sometimes consider combining FEEDBACK and 
FEED FORWARD control in some applications?

ANS -  In some applications, the compensation provided by feedback control is not sufficient & accurate .Also, the feed forward control is faster but it is difficult to predict all the manipulated variables.Hence a combination of both is  used.
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