Answer / www.isamqa.com

D - room heater

Answer / rafaqat

Well!!!! close loop system is kind of atumatic system that
have a feed back device which measure the actual value and
then feed this value back to controller then controller
compare the setpoint & the actual value (get from feed back
device)after this control generate + or - signals/
correction to final control element ( that is responsible
for controling the variable quantities).

so if your system have a controller with feedback device,
final control element then it will be a close loop system

Answer / carl_ellis

A room heater has a thermostat which senses room
temperature and turns the heater elements on or off, as
needed. It is close loop control.

A washing machine can have a closed loop feedback loop, for
example, water level, where a knob sets water level desired
[setpoint], a sensor detects level and turns off water
valve when satisfied. But the overall wash, soak, rinse,
empty, fill, spin functions are sequenced on a timed basis,
which is classic, open loop, non-feedback control.

Likewise a traffic light system can sense the presence of a
vehicle at an intersection, which enables an upcoming light
change, but the sequences of light changes are timer based,
open loop, non-feedback control.

Carl Ellis
Measure First

Answer / uday

A) respiratory System is a close loop system.

Vertebrates have closed circulatory systems. Their blood flows through blood vessels (arteries, veins and capillaries) and they have a heart to push the blood around their body. The human circulatory system is a closed system.

Give me a simple formula to calculate the bore of orifice plate with datas avilable instead of BS 1040.I want to calculate the approximate bore size only.

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please anyone suggest me some good intools training institutes with their place and contact nos.

1 Answers   ABB, Thermax,

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I am working in a process industry, in that there are several sections devided in the SCADA screens and individual sections may START independently. But sometimes i am facing problem i.e, if section 2 Stopped by the operator immediately Section 1 or Section 3 or Section 4 is getting stopped can you expain the reason behind this?

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What is hook's law

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what is the formula for changing Range of Transmitter from X mmwc to some Y mmwc with respect to DCS NCMH flow range from x NCMH to y NCMH?

1 Answers   HCL,

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my data card only does run in my mobile so how can change it that it run other mobile & computer and i can stor data in my data card

0 Answers  

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what are the installation requirement is common to all flow meter when volumetric flow rate is being measured

1 Answers  

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square root calculation for dp flow transmitter? give me a explanation with example

3 Answers  

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with the help of suitable diagrams different types of control valves

1 Answers  

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Sir,I am going to sit for IOCL written test exam. recently.Can anyone tell me the name of 'Objective type Question Book on Instrumentation Engineering ' which will help me. Pl. mail to bidyut_71@rediffmail.com / bidyut.saha2008@indiatimes.com / bidyut.saha09@yahoo.in

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How to Calibrate Transducers? Can you give me a step by ste procedure?

1 Answers  

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why is the sleeve of the cable used for?

2 Answers   Jindal,

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