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Explain the working principle of variable frequency drive?


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Other Instrumentation Interview Questions
 
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i want the equation of this question. Tranmitter range is 120 mmwc and dcs flow range is 1700 nm3/hr. if i want to change dcs range from 1700 to 2400 nm3/hr then how much dp i have to enter in transmitter gmr 2
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what is the difference between RS 232,RS 485,RS 422, how they different from each other TCS 14
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what is electric motorised valve working principle.   1
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Why we use negetive (-)voltage in vibration system   3
difference between null and deflecting instrument. ONGC 5
 
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