Answer Posted / anjali aravindakshan

If one of the 3 phase supply to the induction motor fails the unbalanced stator currents flow.The voltage across the healthy phases increases by (3)^(0.5) times...bcoz of this overheating of motor takes place..To avoid dis we can make 3 phase induction motor to run on 2 phase supply by connecting a capacitor since capacitor does not allow instantaneous change in voltage..in dis way we can make 3 phase induction motor run on 2 phase supply with the help of capacitor....

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1973

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A 400 V, 50 Hz, Δ connected synchronous generator has a field reactance of 0.1 Ω and armature resistance of 0.015 Ω. At full load, the machine supplies 1200 A at 0.8 pf lagging. Under full-load conditions, the friction and windage losses are 40 KW and the core losses are 30 KW. What is the machine’s overall efficiency? Ignore any field circuit losses.

1817

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2102

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The metal-enclosed switchgear and controlgear is subdivided into three types: 1. metal-clad switchgear and controlgear; 2. compartmented switchgear and controlgear 3. cubicle switchgear and controlgear. What is the main differnence between them. State some example.

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2198

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2691

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1936

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