Answer Posted / anuradha joshi

yes

can u plz send me technical questions asked in SCHNEIDER ELECTRICAL technical paper?

4731

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which type of signal used in instrument?

9850

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Why plc require in analog input 4-20amp & 0-10 volt?

1137

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Which Signal hart communicator work? If there any signal change when hart connect while transmitter in line ?

1403

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How flow can be measured with dp?

1137

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how to calibrate mass flow meter (Coriolis)? Example calibration range: 0 to 2500 kg/hr line size 3" fluid: Etheline glycol (MEG)

2683

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How to calibrate H2s Dectector

1616

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how to check earthing,what is minum ohms for proper earthing

1949

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If a warning lamp will operate with the ground circuit is bypassed with a jumper wire to ground, what should you check?

2083

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Decibel.

2545

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How to calibrate an pressure gauge with yantrika test bench?

2909

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plz tell me clearly about PID.."when v have to change I value,D value,GAIN??

2176

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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.

2174

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what are the steps I have to deal with?

2244

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Calculate the maximum pressure drop that can be allowed to occur across a control valve, so that we can prevent cavitation / flashing from occurring. Use the following formula: Δ P allow = Km (P1 – PvapourA) where, Δ P allow - the maximum allowable differential pressure for sizing purposes, or terminal pressure drop; Km- the valve recovery coefficient from the manufacturer’s catalogue; P1 - absolute inlet fluid pressure; PvapourA - absolute fluid vapour pressure at the inlet temperature; Use Atmospheric pressure = 101.3 kPa, P1 = 1200 kPa(g), PvapourA = 4 kPa, KM = 0.72

2211

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