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What is the difference between radar and ultrasonic level
transmitter? Which method is best and more accurate?
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Answer Posted / shailesh rathwa
RADAR IS .. LENCE WAVE BASED.. IN INDUSTRIES ,,, MOSTLY USED RADAR CAUSE ITS PERFECT MEASUREMENT AND HAVING ZERO ZERO ACCURACY .. WE ARE USING 10 YEARS OLD RADAR L.T. .. BUT STILL ITS WORKING PERFECTLY .. NO ANY PROBLEM FOUND ..
AND YEAH.. ULTRASONIC IS SOUND WAVE BASED APPLICATION..
BUT RADAR IS.. 10000000 % PERFECT THAN ANY OTHER ... L.T.
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please send me the inteview questions in IOCL
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.
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