Question { Jindal, 19590 }

deference between DCS and PLC including date processing and
architacture.

Answer

PLC will have faster date processing then dcs..... PLC will send the date 50ma while DCS will 500ma.... it is not the accurate valve it is the bacic difference.

according to the Architecture PLC is easy but DCS is difficult, but DCS is good because in DCS we use HPM->HPMM->FTA->FCS->Field (redundancy is good in DCS)

Question { 9828 }

Explain Difference between Bech set and operating range of
control valve

Answer

if u do the adjustment in the string at the actuator, or
compress the spring, u will get the opposing force to move the
stem in the control valve that is called bech set .it depents
on the control valve. mostly foe small valve we use 3-15 psi
and for medium we use 6-30 psi .thanks

Question { 9828 }

Explain Difference between Bech set and operating range of
control valve

Answer

if u do the adjustment in the string at the actuator, or
compress the spring, u will get the opposing force to move the
stem in the control valve that is called bech set .it depents
on the control valve. mostly foe small valve we use 3-15 psi
and for medium we use 6-30 psi .thanks

Question { 8428 }

in which application we use bigger size actuator

Answer

for high pressure application we use the the bigger actuator is wrong concept, mostly in the early days days we used this kind of actuator, mostly used for diaphragm and piston type actuator , if u use diaphragm type then u need big cascade, for high pressure , but we should change the cascade for regular intervel. in our company we control the 220 kg/cm2 of pressure in the small actuator only, bigger actuator is disturbance only large space is needed and difficult to calibrate. thanks

Question { 5506 }

i feel sq. pipe is better than round pipe pls give comment
for this.
advance thanks for reply

Answer

i think in both we can get the center point, because in square all sides have the equal length, like wise in circle they have the equal diameter ,so in both we can get the center point..
* round pipe is always used because at the bending the flow is same,but in square at the bending we can't expect the perfect shape there may be some leak , tat's is the main reason i think so. we can't expect the 100% flow into the pipe, error may be around +or- 10%

Question { Thermax, 13460 }

HOW WE MEASURE A DRUM LEVEL BY DP TRANSMITTER ? WHAT IS ITS
FORMULA ?

Answer

Drum level can be measured by , first find the pressure difference between H.P and L.P,so that we can find the differential pressure. then by using the formula p=density*gravity*height , we knew the pressure now, then density and gravity also we knew, then find height.

Question { 8456 }

comparision between fet and bjt

Answer

BJT--> BIPOLAR JUNCTION TRANSISTOR ( BOTH ELECTRON AND HOLE)
* IT IS CURRENT SOURCE
FET-->FIELD EFFECT TRANSISTOR(ELECTRON OR HOLE)
*IT IS VOLTAGE SOURCE