Answer / Ganesh Shankar Singh

Quartz crystals are widely used in precision oscillators for frequency control and as sensors in various applications. Two common uses for process parameter measurement are:

1. Quartz crystal thermometer: It measures temperature by detecting the change in the resonant frequency of a quartz crystal due to temperature changes.
2. Quartz piezoelectric accelerometer: It measures acceleration or vibration by converting mechanical force into an electrical signal.

in my company organisation in plan to take new PLC system for replacing old relay system , for that what I/P needsd to submit to the system house of PLC supplier?

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any body please send me the old question papers of ongc test.

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Hi friends, from Aug 4th onwards iam getting spikes for analog inputs in our DCS for a period of 800ms. I throughly checked every thing, finally i found that the DI, DO's from MCC panels shields are terminated in the Signal Earth where Analog Input signals shields are terminated. Is there any problem with this type of termination?. i checked the induction voltage from MCC and getting around 25VAC, please suggest me in this concern. Our plant is 8months old only. DCS is Siemens Make Simatic PCS7, and the transmitters are Yokogawa make.

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what is loop?

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HOW DPT WORKS?

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