Recent questions and answers in Single phase transformer

answered Jul 27, 2018 by anonymous

A single phase transformer is designed to operate from 50 Hz, 1100 V supply and to have an output voltage

A single phase transformer is designed to operate from 50 Hz, 1100 V supply and to have an output voltage of 240 V at no load. The core has mean area of 30 cm2 and the flux density has not to exceed 1.3T. The number of secondary turns will be (a) 1270 (b) 1017 (c) 768 (d) 277

Last answer: E2=e2=4.44*flux*N2*f=240 V Flux=Flux density* Area Area=30 cm2 =30*10-4 m2 Flux= 1.3*30*10-4 Wb=39*10-4 Wb E=240= 4.44*39*10-4 *N2*50 N2=277.

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answered Jun 17, 2018 by anonymous

Two single-phase 150 kVA, 7200/ 600 volt transformers are connected in open-delta. The maximum three-

Two single-phase 150 kVA, 7200/ 600 volt transformers are connected in open-delta. The maximum three-phase load that they can carry is: A) 300 kVA B) 75 kVA C) 259 kVA D) 249 kVA

Last answer: Two single-phase 150 kVA, 7200/ 600 volt transformers are connected in open-delta. The maximum three-phase load that they can carry is: 259 kVA

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asked Jun 4, 2018 by anonymous

The magnetizing reactance of a 4 kV/ 400 V, 50 Hz single-phase transformer on low voltage side is 35 Ω.

The magnetizing reactance of a 4 kV/ 400 V, 50 Hz single-phase transformer on low voltage side is 35 Ω. The magnetizing reactance on the high voltage side is (A) 0.35 Ω (B) 3.5 Ω (C) 350 Ω (D) 3500 Ω

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asked Jun 4, 2018 by anonymous

At maximum efficiency of a single-phase transformer, the load power factor is

At maximum efficiency of a single-phase transformer, the load power factor is (A) unity (B) lagging (C) leading (D) zero

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asked May 25, 2018 by anonymous

Three single phase transformers each with 10 kVA rating are connected in a closed delta arrangement. If one

Three single phase transformers each with 10 kVA rating are connected in a closed delta arrangement. If one transformer is taken out, the output capacity of the system will be (a) 20 kVA (b) 8.66 kVA (c) 17.32 kVA (d) 10 kVA

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