Answer / suraj kumar

300 Hrs and 6 Months

Answer / hemanth kumar.b

300 HRS OR 6 Months which is earlier should do the b-check.

why should be the frequency is 50 hz only why not others like 45, 95 56 or anything , why should we maintain the frequency constant if so why it is only 50

3 Answers  

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how did the differential relay work to protect the power transformer

4 Answers  

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What is the theoretical reason for the size of a zig zag grounding transformer to be 1.732 times less than that of a wye-delta grounding transformer used for the same application?

0 Answers  

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why only 26v dc is used in aircraft and 115v ac in aircraft.

0 Answers   Jet Airways,

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I do wonder why current is present in neutral wire?i check single phase lead current feeding air conditioner...on its phase its current was 10A while same was 10A in neutral...as we know in neutral voltage is zero so if voltage is zero then how current appears on amp meter? my second observation is (just imagination)when I touch phase wire it give me shock but when i touch neutral nothing happens although as above its carrying current(amps) third but with same logic...as in simple Alternate current sine curve there is + and there is negative peak.means every time phase changing so how come every time same phase and same neutral stand (pardon for english mistakes)

1 Answers  

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when a hand crancked meggar is used to check most three phase induction motors, how many tests r rquired? Why?

1 Answers  

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What are the advantages and disadvantages of negative feed back?

0 Answers  

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During he starting up of the motor, the upstream's MCCB (350A) always trips due to the UVT relay activated. Can Star-delta starter use for a 20kW Motor (For a powder mixer machine) cause voltage-dip in the supply line voltage? If so, what are the recommended solution to eliminate/reduce the transient voltage dip in the line voltage?

4 Answers  

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What is dry and wet flashover.

1 Answers  

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Difference between PLC and SCADA ? What are merits & De-merits of PLCs ? What are merits & De-merits of SCADAs ?

3 Answers   Ambuja,

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why DOL starter is use in induction motor as it is not reduce the starting torque

2 Answers   Maruti Suzuki,

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what happens when ac supply is given to D.C motor.

17 Answers  

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