Answer / tahir

In AC supply frequency 50/60 Hz. DC motor can not run with good performance. it may produce harmonics

Answer / marsad

Dc motor cannot be run at good performance when powered by AC supply.. this will result in heavy core loss...
if you really wanted to use both ac or dc suppy for working a motor. you should prefer a universal motor. which is actually an AC series motor with some modifications.. .

Answer / raghunath

The motor can rotate from forward and reverse direction depending upon the + and - cycles

how oil in the MOCB was reduced compared with OCB? what are the features of the MOCB?

0 Answers   Asahi, BARC, K-Electric,

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Give me clear explanation.What is the Different Between Load break switch and Vacuum circuit breaker

1 Answers  

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Why neutral is not used in three phases dol starter

0 Answers  

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what is physical distance of isolator to VCB in 33/11kv sub stations

0 Answers   Enercon,

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Can u explain : what is supply for train (whether a,c or d.c ).I know that supply is 25000v a.c .But there is rumour that supply is D.C. And also explain how lights and fans inside the trains are working ,and what type of motors are used in trains whether D.C motors or induction motors .If d.c motor, how it gets supply.If traction motors are used then what are traction motors and its functions and how it differs from other motors and also explain about locomotive . please reply..............

9 Answers   NTPC,

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which type of insulation are used on 132kv transmission line

4 Answers  

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please mention the minimum IR value for different voltage systems

6 Answers  

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What is Plank's Law?

0 Answers   Godrej,

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What is the difference between circuit and network.

15 Answers   Jadavpur University, Sail, TCS,

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Work done in a free expansion process is

0 Answers   Caterpillar,

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how to calculate busbar size? if ex:1000amps i need to calculate busbar size and what size of bar?if any example caculation pls give the formulas.

2 Answers  

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What is PF? Formula for calculating PF in HT side?

10 Answers   HSL,

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