Interview Questions Answers in English, Instrumentation

Questions / { abhi }

Questions Answers Category Views Company eMail

how to calibrate vaccum transmitter?

2 English 4140

Why we use 4 - 20 ma?

Answer

in 4-20ma we can easily check the zero and wire breaking in
transmitter. Analog card accept 1-5v dc supply. thatsy V-IR

I=V/R
V=1V R=250OHMS

1/250 = 4MA

V=2V THEN I=2/250 = 8MA

V=3V THEN I=3/250 =12MA

V=4V THEN I= 4/250 =16MA

V=5V THEN I=5/250 = 20MA.

Is This Answer Correct ?

3 Yes

0 No

Question { Reliance, 13607 }

what is the use of impulse line in AFBC boiler , WHY WE
CONNECT IMPULSE LINE TO TRANSMITTER , DRFT GAUGE ETC ????????

Answer

in dp transmitter if we didnt used impulse line steam or
foreign particular amy enter to the transmitter that will
cause sensor damage thatsy for condensate the vapour
impulse lines are used.

Is This Answer Correct ?

2 Yes

0 No

Question { 34845 }

Possible cause of IOP alarm in a DP transmitter:

a: IOP-minimum
b: IOP-Maximum

Answer

if process value is above than instrument range that is IOP
input open and if u remove 24v supply in transmitters it
shows IOP.

Is This Answer Correct ?

35 Yes

2 No

Question { 5452 }

what is ment by PID controllers? explain with example?

Answer

pid means praportional integaral and derivatives.
it is used to minimise the error between process value and
set value (pv-sv) to maintain the process in smooth
condition.

Is This Answer Correct ?

0 Yes

1 No

Question { 7966 }

My flow transmitter range is 0-1000mmwc.DCS range is 0-
100m3/hr.What is correspond out put in terms of milliamps
if my flow is 65m3/hr

Answer

y=mx+b

m=span of 4-20ma (16ma)
x= % value of measured variable
b= offset value in ma live zero (4ma)

y= 16*65/100+4
y= 16*0.65+4
y= 10.4+4
y= 14.4 ma

Is This Answer Correct ?

5 Yes

2 No

Question { Maden, 4008 }

where can we use viberation
transmitter,and how can we control
viberation?

Answer

vibration transmitter
normally used in
compressor, turbine to
measure the vibration by
adjusting the gap voltage.
we cant control vibration
it shows only vibration
reading.

Is This Answer Correct ?

1 Yes

0 No

Question { 8540 }

What types of thermocuple are mostly used?

Answer

j and k type

Is This Answer Correct ?

2 Yes

0 No

Question { SRACO, 5639 }

State 5 different method of level measurements.

Answer

five type of level measurements,

1. Capillary type
2. radar type
3. ultrasonic
4. differential pressure method
5. capacitive type

Is This Answer Correct ?

3 Yes

0 No

Question { 6405 }

I HAVE PRESSURE TRANSMITTER WITH TWO WIRES 24 VOLTS SUPPLY.IF
TRANSMITTER WILL GIVE SIGNAL TO THE DCS WHAT HAPPEN TO THE 24
VOLTS POWER SUPPLY IT WILL DROP OR REMAIN TO 24 VOLTS POWER
SUPPLY.

Answer

voltage vary according to the current vary across the
transmitter. if u connect multimeter to the transmitter in
line it shows only 23v dc nearer.

Is This Answer Correct ?

1 Yes

3 No