Questions and Answers

Hello friends,

Here I am sharing some questions related to sensors and measurement which can be asked in interviews if you opt for core industries like
1) Oil and Gas
2) refining and manufacturing
3) pharmaceutical
4) chemical manufacturing etc...

These are the very basic and most important questions.. do not miss to read.
1) can control valve be mounted with actuator in horizontal position??

yes control valve can work in any orientation however the preferred installation is actuator is in vertical position. The installation of actuator is in horizontal or vertical position is manufacture specified. 
here actuator means mechanism which control the position of control valve stem like fully open, 50% open, 25% open etc. you will get know about control valve and actuator in your curriculum subjects. 

2) What are different types of orifice plates? State their uses.

 Different orifice plates are: 1. Concentric 2. Segmental 3. Eccentric

 Concentric:

    These plates are used for ideal liquid as well as gases and steam service. Concentric holes are        present in these plates, that's why it is known as concentric orifice.

Segmental:

   This plate has hole in the form of segment of the circle. This plate is used for colloidal and sherry flow measurement. this is also used for highly dense (highly viscous) fluid.

Eccentric:

This plate has the eccentric holes. This plate is used in viscous and sherry flow measurement.

3) How do you identify an orifice in the pipeline?
An orifice tab is welded on the orifice plate which extends out of the line giving an

indication of the orifice plate.

4) How can a D.P. transmitter be calibrated?

    D.P. transmitter can be calibrated using following steps:

1. Adjust zero of transmitters.

2. Perform static pressure test: Give equal pressure on both sides of transmitter. Zero should not shift either side. If the zero shifts then carry out static alignment.

3. Perform vacuum test: Apply equal vacuum to both the sides. Zero should not shift.

4. Calibration procedure: Give 20 psi air supply to the transmitter and vent L.P. side to atmosphere. Connect output of the instrument to the standard test gauge. Adjust zero. Apply required pressure to the high pressure side and adjust the span. Adjust zero gain if necessary.

5.What is the use of valve positioner?
Valve positioner can be used for following reasons:
a. Quick action
b. Valve hysterisis
c. Viscous liquids
d. Split range.
e. Line pressure changes on valve
f. Bench set not standard

g. Reverse valve operations

6. how liquid level can be measured using differential pressure transmitter??
here video description for this question..

I will post more questions soon,,,, enjoy reading😊