why is an oxygen sensor used in a boiler stack

2 Answers   HCL,

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What is the minimum rating availalbe for weld neck orifice in market?

0 Answers   Jindal,

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is fan is a transducer or inverse transducer?

5 Answers  

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how to callibrate a new i/p converter

7 Answers   TATA,

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Why 24VDC power Supply is used as standard for all loop powered transmitters?

8 Answers   Lupin,

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what is the difference between Digital output DO signals /Commands for start/stop and Solenoid valves ??

1 Answers  

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The DCS has the following signal type:

3 Answers  

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A PLC is programmed to drive three motors A, B and C as follows : After running motor A for an hour, motor B should get ON and motor A should get OFF. And after running motor B for an hour, motor C should get ON and motor B should get OFF. And after running motor C for an hour, motor A should get ON and motor C should get OFF. (That is, a cyclic repetition with time period one hour) Now, the second condition is: If any motor gone faulty and is tripped, the consecutive motor should get ON and the faulty (tripped) motor should be eliminated from cyclic repetition. The remaining two motors should bear the cyclic repetition of one hour each. (For healthy motor take logic as high and for tripped motor take logic as low) Now, the third condition is: When motor A load(Amps) exceeds 60% of its rated load, motor B should get ON in parallel to motor A. And when both motors A & B are running in parallel, and if their load exceeds 60% of their rated load, motor C should also start in parallel to A & B. [Here the cyclic repetition is eliminated, until their loads become normal(40%)] [Take logic high(1) for load at 60% and logic low(0) for load at 40%] Now draw a flow chart or a ladder diagram to fulfill the above condition.

0 Answers   MNC,

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hi i am eswar i want to know the instrumentation interview questations for eil(engineers india ltd) i have applied for engineer post in eil please help in this.my mail id eswar310@gmail.com

0 Answers  

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what is the diffrene between DCS System and PLC System

5 Answers  

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Close loop and open loop.

3 Answers   CCIE,

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What is the difference in clamp on type and inline type ultrasonic flow transmitter.

1 Answers  

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