Answer Posted / pradeep patil

Current 4-20 mA is prefered than voltage because:--
1)current signal can be carried to long distance without
drop in signal strength.
2)Less Electro Magnetic Interference effect in current
signal
3)no short crcuit spark happpens when signal cable
accidently short each other.
If your controller works on voltage (1-5 vdc) then 4-20 mA
can be easily converted in to voltage after connecting 250
ohm resistance accross signal cable as per ohms law.

please send data bank of quetions answers on analytical instrumentation.

1815

---

Pl send the model question paper of mahagenco account officer post

2717

---

what is function of switch, and how is it work, explain with difination

2283

---

why we use 3 wire rtd direct wiring for temperature measurement instead of temperature transmitter like bearing temperature

1775

---

Full form of KKS when use DCS.

3103

---

Draw a group of instruments interlocked to a Pump & Motor?

1228

---

why any measurement made interms of pressure is more accurate ? to be more precise most of the flow velocity is made interms of pressure and it is accurate. what is the reason behind pressure measurement being accurate ?

1849

---

What is intrinsic safety mean.

1857

---

Why we are using reverse action in displacer types level transmitters on some Vessels?

2482

---

Instrumentation Safe Guarding test. How to determine the interval time of the test. eg:Halfyearly,Every year,Every three years etc.

2067

---

What is the constant voltage unit?

1012

---

any questions on motor and energy conversions machines?

2175

---

Where Can i take a SPI INtools training in Mumbai? In Rolta India Ltd to whom I should approach regarding of SPI INtools Training?

2722

---

what different types of problems do occur while doing instrumentation commisioning and how to solve them? please explain in detail

1706

---

What is voltage regulator?

1056

---