Answer Posted / tapiwanashe

because the torque is only developed when the synchronous motor is running at the speed of magnetic flux , therefore, the motor needs some type of device such as damper winding to bring the rotor to synchronous speed

What are the classifications of oscillators?

1064

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In hydel power plants, L.A's, S.C's are placed inside the control panel boards. what is the purpose? [already the total body was earthed to ground.]

1973

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What is sensitivity of a measurement?

1116

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what is the disadvantages of common earthing for AC and DC equipment? (i am talking about inverter control room and inverter duty transformer earthing is common...?)

1650

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If we use 250A MCCB as a incomer in Control panel for a fault level of 50kA for one second ,assuming temperature rise from 85 Deg. to 100 Deg , Then what will be the Aluminium Bus-bar size for 250A MCCB? Explain in detail.

2328

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all interview questions with answers of ntpc (2000-2009

2201

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What are the conditions to be satisfied for parallel operation of dc generators?

1073

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2211

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a)In a 3-phase 4-wire circuit, a circuit breaker is selected to protect the circuit whose highest fault level is 6.6 MVA. Determine the required minimum breaking capacity in kA. (Note: Covert 3-phase power in terms of kA to find answer.) b)Using the below, determine the required minimum making capacity in kA as a “peak value”. Rate breaking capacity (Icn) ka: Icn<= 1.5 Factor = 1.41 1.5

1688

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why the protection turbo generators is most complex?

2024

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What is maximum power transfer theorem?

1086

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how to set the time in digital timer ?

2002

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1683

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HOW TO TEST A LIGHTENING ARREST ER ?

2188

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we have one oven for 12 zone we are installed ir lamp in oven we control load from thyrister and 0 to 5vdc so our zone no 8 getting bright in fraction of second so what we do.. Please answer

1710

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