# Electrical Engineering - Transformers - Discussion

### Discussion :: Transformers - General Questions (Q.No.17)

17.

A transformer

 [A]. changes ac to dc [B]. changes dc to ac [C]. steps up or down dc voltages [D]. steps up or down ac voltages

Explanation:

No answer description available for this question.

 Vinothkumar said: (Feb 3, 2011) A transformer works on ac only. It transforms power.

 Zia said: (Feb 20, 2011) By using transformer we can step-up/step-down ac voltages only.

 Kartheek said: (Feb 20, 2011) Works on the principle of mutual induction which is possible in ac due to alternating in nature.

 Aslam.Sote said: (Mar 2, 2011) Transformer is responsible for to make voltage step up or step down without change in frequency. Step up-step down depends on turns of transformer coil.

 Somnath said: (Apr 9, 2012) Transformer responsible for step up/down of A.C power only. If the transformer use for D.C power then due to constant flow of D.C current its winding gets burned.

 Rajesh said: (Jun 11, 2012) Why transformer not works in the dc supply ?

 Veerababu said: (Jul 10, 2012) How converts 2ph to 3ph supply with transformer ?

 Chip Tausch said: (Sep 26, 2012) To step DC up or down you need something like a buck or boost converter. AC electricity is one reason we're able to have our power grid so wide spread. Because we can step up and down AC electricity from the supplier to the home.

 Sarita said: (Oct 14, 2012) Transformer not works in the dc supply because there is no flux change in the dc so the induced emf in the secondary of transformer is zero.

 Devi said: (Feb 20, 2013) Because a transformer works on the principle of mutual induction and it requires only alternating flux linkages hence the dc supply does not consists of frequency to offer flux linkages. So if we apply dc supply it will result in burning of primary winding.

 Praveen said: (Mar 31, 2013) @Veerababu. Study about scott connection that will give you info about 2ph-3ph conversion.

 Balu said: (Aug 2, 2014) Transformer is a AC static device, which can transfer the power from one circuit to another circuit.

 Mounika said: (Aug 26, 2014) Frequency is responsible for flux linkages.

 Karthik said: (Sep 16, 2014) May I know transformer is a voltage controlled or current controlled device?

 Sakaria said: (Jan 5, 2015) What about a forward converter, where you have a transformer to step up and down a dc voltage.

 Mandar said: (Jul 8, 2015) Is it possible to starts the lamps without using a power supply?

 Murali1990 said: (Jan 4, 2016) Transformer does not change ac to dc because it is not a converter therefore transformer step up or step down the voltage.

 Ranjith said: (Apr 5, 2016) Because DC supply have no frequency.

 Ramchandra Ladkat said: (Sep 1, 2016) Because transformer work only AC supply.

 Gambiza. A said: (Oct 11, 2016) A transformer is power alternating device. Works only AC supply.

 Kingsley said: (May 24, 2017) Transformer works only on AC supply.

 Sharmela said: (Jun 15, 2017) What will happened if the secondary transformer is zero?