Answer / jaadeesh

N=(120*f)/p

Answer / mr.engineer

If it has a direct coupling with the motor .Use this formula
n=(120*frequency)/(2*number of Poles.)

Number of poles:You can get it from name motor name plate .
Frequency:50Hz or 60hz depends on your system.

(Or you can see Motor Speed and fan speed will be same as
motor speed)

when the motor was star position that is running ok but when the motor was delta it was tripped? why?

5 Answers   Nimbus, SEL Manufacturing,

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how can service sitting be setted for MCCB?Example for sittings IR (CURRENT RATING),IS(CURRENT STARTING)IO (current operating)?

0 Answers   SISL,

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two phases with neutral supply can be taken in 3C X 10 sq.mm cable .

0 Answers   SPCL,

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How we can design a cable for a 3phase load.

1 Answers  

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how we can adjust for three phase motor cold stall time ,hot stall time and thermal register set up?

0 Answers   OPS,

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how to claculate the ups load in KVA pls give the if any fourmoul?

4 Answers  

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Regarding units, for voltage we are denoting Volts as V but in case of current we are not denoting Ampere as A instead as I..Why..? Any technical reason for this..?

1 Answers  

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my name is venkat .i have good percentage in my academics(ssc 86, intermediate 83 b.tech 73) my question 1..after completion of my ssc i joined in bpc but i didnt got rank in emcet so i completed MPC in one year compartmentally ..so here what am expect question from this background?

0 Answers  

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What will be the excat cable specification in Sq MM...please find the details below.... Induction Motor HP:55 Amps:70(starting Amps),45(Running Amps). Volts:415

1 Answers  

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How dc generators direction can be reversed ??

2 Answers   GPSC Gujarat Public Service Commission,

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What is the difference between shortcircuit current, rated current of cable & MCB with example? What will be the size of cable required for 5.5 KW motor (Full load current 10 Amps approx.), Starting current with DOL is 120 Amps. Aprrox. Short circuit current with LLLG fault is 2000 Amps Approx.

0 Answers  

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How to calculate amount of copper used in a motor (AC&DC), generator and transformer? Datasheet provides power rating and mass of the equipment....can we somehow use this available info.

1 Answers  

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