Why synchronous motor runs at a fixed speed? what is the name of that fixed speed?

4 Answers  

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any one please tell taht what type questions will be asked in BHEL interview, i am having interview on 24th Dec, please send this to mail pradeepsistam@yahoo.co.in

0 Answers   Bhel,

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Can any one give an explanation about rating factors of cable? if we are laying the cable on the air with an temp 15 degree then rating factors will be 1.15 and if we are laying the cable on the air an temp 60 degree then rating factor will be 0.76 please describe it and what is the difference between rating factor and derating factor?

0 Answers  

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what is formula in determining the size of Circuit Breaker for transformer with the following specifications. 7 units of 1600 volts (primary) and 400 volts (secondary). Both Primary and Secondary will have a circuit breaker which is SF6. What should be the Switchgear Main Breaker Size anf the sizes of each brances Circuit Breaker for Primary.

1 Answers   ABB,

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what is the operation of UPS ? can any one answer me?

7 Answers  

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what is auto transformer?

4 Answers  

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a.)Ammeter and Voltmeter read rms value or avg. value ? b.)What are symmetrical and Unsymmetrical faults?

2 Answers  

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what is the procedure to carry out BDV test of a transformer ?

3 Answers   BirlaSoft,

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why phase to phase voltage are 290 rather then 440?

1 Answers   Bosch,

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which is dangerous AC or DC?

10 Answers  

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A 3-PHASE TRANSFORMER IS USED TO STEP-DOWN THE VOLTAGE OF A 3-PHASE, 11KV FEEDER LINE. PER-PHASE TURNS RATIO IS 12.FOR A PRIMARY LINE CURRENT OF 20A, CALCULATE THE SECOUNDRY LINE VOLTAGE, LINE CURRENT AND OUTPUT KVA FOR FOLLOWING.A)STAR- DELTA.B)DELTA-DELTA.

0 Answers   Ispat, Red Bull,

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What will happened if the neutral of the (star connected secondry) Xformer disconnected? (if its Above KVA rated one)

0 Answers   Equate,

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