Answer / pillay

DOL starter means a Direct On Line starter, where the AC
supply is directly applied across the motor terminals
whenever it is used unlike some bigger motors where the
power supply goes through a starting system to enable a
smoother start or a reduced current start.Some examples are
star delta ,auto transformer starter ,rotor resistance
starter, soft starter etc.

why corona loss is less with negative polarity?

3 Answers  

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which connection is safer series or parallel?usually which connection we prefer at home?

5 Answers  

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1)what is the function of a frequency inverter? 2)If a few frequency inverter are connected onto a device network,what are the two setting that will ensure the frequency inverter work properly on the network. 3)whats is the name of the input sensor for weigher? 4)How to confirm that the load cellis faulty? 5)Describe briefly the steps to validate that the weigher is working properly? 6)Describe the procedure to validate the flowmeter accuracy? 7)Describe briefly the steps to validate that the tempreture sensor/transformer is working properly. 8)what is the adjustment that need to be done when you are calibrating the temperature transmitter ? 9)what are the safety measures to be taken before disconnecting motor for rewinding. 10)whats is the synchronous speed in rpm of typical 4pole 50hz motor? 11)whats is the formula for kw, ohm's law 12)if a 3phase motor is rated 3kw,415vac,what is it's rated ampere?

0 Answers  

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1)we r having one problem .one dry type transformer(6.6KV/433V)is taking high magnetizing current on delta connected HV side of "U" phase when compared to other two phases.could any body tell the reason why it is happening? 2)why CT secondary side protection core has got higher winding resistance when compared to that of metering core of same CT?

2 Answers  

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On the secondary side of a distribution transformer, we use 1c x 630 sq mm cable. Why dont we use 4 core cables instead of 1 core cables on the secondary. Why we use aluminium cable glands on the outgoing instead of brass cable glands?

2 Answers   Siemens,

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how it can be decided what will be the rating of CT and PT to be used in LT or HT cables?

3 Answers  

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What is distance between electrical panel to land ?

0 Answers   Fresher,

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CAN A CD/CLOCK RADIO WITH 110V 60HZ WORK ON A 110V 50HZ FEED.

3 Answers  

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how to check IR values in alternator winding?

3 Answers   Birla, Naftogaz,

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Why 15Amp. MCB is suitable to carry load of 1.5Ton Ac please Explain?

0 Answers  

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what r Grid stations?what r there role.Explain in detail

1 Answers  

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line diagram for mcb , mccb , rccb .

1 Answers  

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