how to calculate the speed of a induction motor without using tacho meter?

6 Answers  

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how wud i know that whether i have to use unitized package substation or transformer?

1 Answers  

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3 shows a 415 V, 3-phase generator supplying a 3-phase 415/110 V transformer. Draw the individual and combined impedance diagrams to a base of 10 kVA. Determine the system fault kVA and the fault currents at the 415 V and 110 V busbars for short circuit faults on the transformer input or output terminals. Work in p.u. values of impedances.

0 Answers  

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Can any one explain me about 2 phase motors ?

2 Answers   L&T,

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it is possible to rotate the DG engine dc starter with wrong polarity connections? why?

0 Answers  

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sir, why alternator output is connected to delta side in to generating transformer? any reasion?

3 Answers   Kirloskar,

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Why double earthing is required ?

1 Answers  

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During the transients in alternator,the mechanical power input remains almost constant while the electrical power output changes significantly.Why?

1 Answers  

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We use ungrounded DC system (220V/110V) for control and protection system in substations etc. Suppose we have long 2 core DC cables running from our DCDB in control room to the load (length of around 2 to 3 km). Do we need to protect these long DC cables from earth leakages or not? If yes how?

5 Answers   Siemens,

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full form of flry b

0 Answers   KPIT,

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if two bulb of 50w &30w apply in series having 230v the which bulb glow bright ,why

10 Answers  

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How to calculate no of EARTH PIT? Describe the formula as per IS standard?

0 Answers  

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