Answer / gautam_etrx.engg

It is "Sillicon Controlled Rectifier". It's a four layer
device (pnpn) used for controlled firing.

Answer / balaji

SCR is northing but silicon controlled rectifier used to
convert the AC to Dc upto 6.5 kv.

Answer / gaurav

SCR is basically a Silicon Controlled Rectifier,
4 layer device pnpn
3 terminal device i.e, Anode , Cathode and Gate.
When anode to Cathode is Forward bias only that time it
Conducts..otherwise it remain in Off state.
Gate is applied to reduce the Forward voltage so that it
conducts for small applied voltage.

Answer / anand

.Silicon
controlled
rectifier...It
is mainly used
for reducing
firing angle @ @
applic like soft
starter's etc

What are different types of valves?

0 Answers  

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what is the difference betwwen the 2wire level transmitter and 4wire level transmitter??and their applications also??

2 Answers  

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how do we commission inergen system?

0 Answers  

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what is the reset offset and control system in instrumentation

0 Answers   ABB,

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Q1: Consider part of a control loop, which excludes the transmitter, consisting of a process, a controller and a control valve which may be represented by two dead times of 0.5 min each and three exponential lags of 0.8 min., 1.0 min. and 1.5 min. respectively. We wish to express this system as an overall first order plus dead time (FOPLD) model ie gain, time constant and process dead time. (We will see later that this is often done, to simplify controller tuning). For this exercise, gain is considered to be 1.0. (A) If the transmitter is a flow transmitter whose behaviour can be described by a dead time of 0.2 min. and an exponential lag of 0.5 min. in terms of the overall dead time and overall first order lag how can the system behaviour be approximated ? Overall dead time = Overall time constant = (B) If the transmitter is a temperature transmitter with a temperature sensor in a protecting well whose behaviour can be described by a dead time of 0.7 min. and an exponential lag of 15 min. how can the overall system behaviour be approximated now? Overall dead time = Overall time constant =

0 Answers  

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0 Answers   Reliance,

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1 Answers   HPCL,

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4 Answers   Wika,

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4 Answers   SMC,

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3 Answers  

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0 Answers   BARC,

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3. Differentiate between ultrasonic flowmeter and radar type flow meter.

0 Answers  

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