Question

266. A two-winding 220 V/110 V, 1.5 KVA transformer is reconnected as a 220/330 V autotransformer. It is re-rated as:
(a) 3.88 KVA
(b) 4.488 KVA
(c) 1.58 kVA
(d) 2.258 kVA​

Answer 1

Answer:

A two winding 220 V/110 V, 1.5 kVA transformer is reconnected as a 200 V/330 V auto transformer. What's its rating?

Masters abroad - deadlines are approaching.

Its rating is still 1.5kVA.

In its original (step-down) configuration, you could get a total of 1500/110 = 13.6A (at 110V) out of the transformer secondary winding at full load.

When configured as an autotransformer (in the boost mode), however, you can still get 13.6A out of the secondary, even though it’s now at a voltage of 330V. The reason that this doesn’t vastly exceed the transformer’s 1.5kVA rating (i.e., 330 x 13.6 = 4.5kVA) is because in the autotransformer configuration, there is effectively no current flow in the primary winding (in a lossless transformer - in reality, the current that flows in the primary is the magnetizing current).

Answer 2

Answer:

option B is the correct one

Explanation:

no need to mark as brainliest but give a thanks please