Answer Posted / kkrameshkumar

Only the diaphragm actuator type control valves can be
operated without positioners provided that the spring range
of the actuator is within the range of control air pressure.

Cylinder actuator type control valves cannot be operated
proportionally without a positioner. only on/off can be
done.

With positioner we can achive the exact position of the
control valve with speed. If positioner is not there then
the actuation will be sluggish and we cannot get exact
postioning of control valve

please send me some question papers of HPCL aptitude test ?? please send it to bipinb.28@gmail.com ...

2025

---

What is the use of single seated valve?

1121

---

we want to control pump in let pressure and tank (for exp) our inlet line if water cam and pump will on and when our tank will full pump will off also if our inlet pressure low pump will off even tank not full.this pump i want to uses on our water supply line.

1765

---

when placing a vent or drain hole on an orifice plate should you measure from the center of the bore up or down for the vent placement?

1812

---

what is performance test.need defination

1761

---

in valve is constructed as per SME B 16.34, then which standard is used for fire testing of valve?.

2059

---

explain key exchanges in all security modes WPA,WPA2,TLS?

2097

---

CONTROL VALVE OPERATING IN MANUAL BUT NOT IN MANUAL. WHAT SHOULD BE THE PROBLEM ?

1938

---

How vortex sensor used for steam flow measurment can be checked on line i.e without taking out from process line.

2185

---

Why is the orifice tab provided?

1293

---

What is Span Error

728

---

what is SIL 1 2 3

2091

---

Can anyone send most commonly asked interview question in Oil & Gas industry

2310

---

how many type of plug are used in pneumatic control valve,name them.

5558

---

Difference between dcs and plc including date processing and architecture.

1201

---