Instrumentation Interview Questions, Answers for Freshers and Experienced asked in various Company Job Interviews

Instrumentation Interview Questions

Questions Answers Views Company eMail

what is the differnce betweeen hart and smart tx

3 7883

pls any1 sugges me book for plc,dcs & scada..

1 4756

procedure to commission a drum level transmitter

1 7665

Whether the DI, DOs shields can be connected with Analog Input Shield Earthpit?

1990

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.

1 4502

WHY WE WILL USE 0-24VdC IN ELECTRONIC CIRCUITS AND INSTRUMENTATION TRANSMITTERS?

Aban Power, Jindal, JSW, Sugar Factory,

3 12538

what is 24vdc live and dry supply

2268

What is the reason for not giving very High Proportional Gain Kp in PID Controller?

ABB,

2 7957

What is the basic difference between Modbus and CAN Open Protocols

6440

If a differential pressure transmitter is calibrated for 0~2500 mmH2o and transmits a 4~20mA dc signal. The transmitter is placed across an orifice plate which is sized to create 2500 mmH2o differential at 5000m3/Hr a) what is the flow rate when the transmitter signal is 13.0mA DC? b) what is the signal output of the transmitter when flow rate is 2500 m3/Hr ?

5 24784

what is the diffrence between pressure safety valve & pressure relief valve....pls

Oil India,

2182

why relays are used with plc?

4 21096

how to make a calibration for differential pressure

2 6572

what is virtual instrumentation

2281

what will be the output of the temparature transmitter if temp is 120 degre celcius.

Base Automation, NTPC, PDO,

1 3810

Post New Instrumentation Questions

Un-Answered Questions { Instrumentation }

define feed forward control loop with example and drawing?

3206

In dcs panel we are using diff type of modules ?what is module ? what is the use of modules ?diff type of module?

1971

what is the difference between Cv and air consumption? why the customer needs Air consumption details?

1978

Dear Friends, we are planning to design Power distribution and Fiber optic in the same cabinet.Like Front side Fiber optic and Rear side Power distribution.Is it any possibility of problem occurs like interference etc? Your answer is highly appreciate.

2215

Can anybody please let me know Orifice plate sizing calculation formula and step by step procedure

1994

What is first echo & echo window in radar type level transmitter?

1688

What is the constant voltage unit?

1076

How to Calibrate Level Troll in field

1399

Why not come out analog output in ABB EL3020 when display show correct value

1884

why we are using drum level control valve air to close?

2092

can we copy the software from a transmitter using hht(hart 275) ?

2077

what is the procedure to callibrate temp controller ,pressure controller,etc. suppose a temp controller showing error 1.5 degree centigrate how can i minimize it.

2345

while i check zero check for dp flow transmitter some fluctuating came (0 to 458 kg/h) what is the reason?

1895

Describe a time when you anticipated potential problems and developed preventive measures.

2914

For crude application in floating roof tank, how to calibrate a DP Transmitter? How is the floating roof weight considered?

3125

For More Un-Answered { Instrumentation } Questions Click Here