Answer / kavitha

Ac supply will come. because commutator in a dc machine
works as a rectifier.

Answer / mgr

It just works as AC machine.

Answer / archana

purpose of commutator is to produce continue current . if
commutator is placed we gft dc otherwise ac

ASTM D 3455 - Standard Test Methods for Compatibility of Construction Material with Electrical Insulating Oil of Petroleum Origin has been used for Testing Transformer Oils with a product placed in it. Aged Control Oil has a Power Factor of 0.032% at 100°C. Aged Oil with a Test component has a Power Factor of 0.093% at 100°. Is this increase acceptable? If not why? How much increase is acceptable?

0 Answers  

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What is the difference between earthed and unearthed cable

5 Answers   FT, L&T, Suzlon,

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while doing the excitation current test on power transformer what is the value of voltage to be applied? Nomonal rated voltage or 10% of rated voltage? Is it necessary to apply on high voltage side?

1 Answers   ACC,

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Why DC weldings sets preffered over AC considering human safety aspects ?

2 Answers  

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What is the main difference b/t Earth leakage relay & Earth fault relay.I want protect my LT panel(Distribution Panels)which relay have to propose.......

1 Answers  

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What is the difference when selecting a cable between AC and DC current?

13 Answers   ABB,

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Why -48V dc power supply using in telecom field?

7 Answers   APC, Cisco,

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What is the significance of vector grouping in Power Transformers??

3 Answers  

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what is destructive and non-destructive testing of welding

0 Answers  

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Is it benefitial to supply 210v ac to lighting fixtures instead of 240v ac?

2 Answers  

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why dc series moter is not started at no load?

5 Answers   IOCL,

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why transformer has more efficiency compare to rotating machine?

3 Answers  

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