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Explain the working principle of variable frequency drive?


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Other Instrumentation Interview Questions
 
  Question Asked @ Answers
 
why the derivative in PID is always set to zero?   3
WHAT IS MEANT BY SUPERVISORY CONTROL?   3
What will the new flow factor if D/P Transmitter is RE-RANGED from 25" WC to 50" WC ADMA-OPCO 3
when we calibrate the DP transmitter at that time which matrial we used in pressure pump?   4
What is the difference between rich gas and lean gas?   2
what is the role of proportional in process control? OGDCL 6
plc trouble shootings?   3
In case of Transmitter's(e.g.Ultrasonic Flow meter ) we have an normal practise of selction of upstream and downstream distance such as (20D and 5D ).can anyone please let me know whow to calculate "D" ?? i guess it refers to pipe thickness is t right ?   1
If a control valve is hunting means means if we are giving 50% to the cv, the cv will open at 51% then slowly slwoly it will reaches 49% , then it will reaches again 50%, this type of action occured frequntly.. so what to do for solve this problem. The possible cause is in volume booster or positioner's relay.. positioner is double acting .. and make siemens..sipart.The cv is double acting and mounted for anti surge operation, it having 4 nos. volume booster, one sov, one positioner, etc..? Shell 1
What is the function of a diaphagram   4
How to check vortex flow meter is in good condition while we do not having calibration setup?   4
Definition of level   2
 
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