Answer / himanshu singh

AC stands for alternating current.It has frequency in it.It
flows in single,dual or 3 phase as per requirement.Thus it
has phase and neutral i.e return...also it has pulses and
follows sine graph.
Where as DC stands for Direct Current.It has zero frequency
and has one positive and one negative.Infact Dc is much
powerful than AC.

Answer / rajesh kumar

amplitude of an ac voltage continiously with time
it has a frequency
dc voltage does not have frequency
the amplitude does not vary with time

what is the different between plc and dcs ? I know full name of this two but I want to know what structure and working style and speed I/O capacity and controller difference?

2 Answers   L&T,

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1 Answers   HHJ,

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Explain the difference between differial pressure & delta pressure?

1 Answers  

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If a control valve is hunting means means if we are giving 50% to the cv, the cv will open at 51% then slowly slwoly it will reaches 49% , then it will reaches again 50%, this type of action occured frequntly.. so what to do for solve this problem. The possible cause is in volume booster or positioner's relay.. positioner is double acting .. and make siemens..sipart.The cv is double acting and mounted for anti surge operation, it having 4 nos. volume booster, one sov, one positioner, etc..?

2 Answers   Gujarat Fluorochemicals Limited (GFL), Shell,

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0 Answers  

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1 Answers   Sabic, SPIC,

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what is mean by live zero and dead zero

3 Answers  

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what is the minimum power (P=VI)to produce a spark?

0 Answers  

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please tel me the calibration of pneumatic controler.

0 Answers  

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what is the calibration standard for pressure and differential pressure transmitters?

1 Answers   Thermax,

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1 Answers   Amtek, Hamsco, IJT,

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selection of the zener barrier for the hazardeous area zone 0

0 Answers   Siemens,

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