Electrical Engineering - Transformers - Discussion

Discussion :: Transformers - General Questions (Q.No.18)

18. 

The primary of a transformer is connected to a 6 V battery. The turns ratio is 1:3 and the secondary load, RL, is 100 . The voltage across the load is

[A]. 0 V
[B]. 6 V
[C]. 18 V
[D]. 2 V

Answer: Option A

Explanation:

No answer description available for this question.

Waseem Guru said: (Dec 13, 2010)  
Transformer will work on only A.C. supply. But battery will provide D.C. supply so no question why transformer is not working.

Santosh said: (Mar 1, 2011)  
Transformer may be burnt out.

Narendra said: (Jul 11, 2011)  
Transformer will only ac supply which is step or down ac supply but battery will provide dc supply then t/m is not working.

Brijesh said: (Sep 21, 2011)  
Because frequency obtained by DC source is zero.

Aniruddha Ray said: (Oct 12, 2011)  
Transformer has working mutual induction effect. In battery D.C. supply fluction flux not developed so secondary voltage zero.

Ammar G said: (Mar 1, 2012)  
Absolutely it's zero , because the transformer works only with AC source.

Kishoregoud said: (Nov 27, 2012)  
Primary winding will burn. So secondary voltage zero.

Rakesh said: (Jul 18, 2013)  
Transformer will only ac supply which is step or down ac supply but battery will provide dc supply then t/m is not working.

Man Singh said: (Oct 9, 2013)  
Transformer work only with AC and pulsating DC. But battery will provide pure DC so secondary voltage will be zero.

Keerthanaa said: (Oct 17, 2013)  
Transformer only works on AC. If DC input is given it draws high current such that transformer will burn.

Nitesh said: (Nov 14, 2013)  
Transformer acts as high inductance and low resistance, but under DC inductance gets zero and due to low resistance a very high current burns the windings and thus the Transformer.

Torpedo said: (Jan 15, 2014)  
Transformer acts as a short to DC. So when the primary is given a DC input there will not be any coupling between primary and secondary. Due to this the secondary side voltage or the voltage across load is zero.

Akash said: (Apr 10, 2014)  
Soln:- Transformer works on AC. Supply so there it will not be operated or if we given the DC. Supply of high voltage its windings get burnt.

Baburao said: (Oct 15, 2014)  
Transformer not allow the AC supply. If allow Transformer primary may be burn.

Shivaganesh said: (Dec 24, 2014)  
With AC Voltage only we get the alternating flux. Without the alternating flux to the core of the transformer there is no EMF induced in the secondary winding of the transformer.

Ajayajjv said: (Jul 31, 2015)  
Primary winding will burn only when will you give more amount of DC supply if you will give less amount of DC supply primary winding will not burn.

If you will give DC to the primary wdg of t/f the flux produced by the primary wdg is constant so the rate of change of flux is constant according to Faraday's law emf will induce in the conductor whenever flux cutting action takes place. There is constant flux so induced emf in secondary is "0".

Manikanta said: (Dec 3, 2015)  
Transformer do not work on D.C because the changing flux not produced automatically Emf is not induced in it so current will not produced. It work on DC transformer will burned. So transformer only work on A.C.

Narayan Sikhwal said: (Sep 9, 2016)  
The transformer is not working on the DC source.

Emmanuel Muzanenhamo said: (Oct 14, 2016)  
Transformer working only with AC source.

Manikanta said: (Jun 20, 2017)  
Transformer will works on AC volatge if we give DC voltage to transformer it may be burnt or damage the winding.

Omair Abubaker said: (Oct 1, 2017)  
Transformer not works on AC supply so the answer is 0V.

Anand Ram Prajapat said: (Jan 19, 2018)  
Transformer working is only ac supply but battery provide dc supply doesn't question work on transformer.

Sathya said: (Feb 6, 2018)  
N2/N1=V2/V1,
3/1=V2/6,
V2=2.

V=IRL,
I=V/RL,
I=2/100=1/50.

Now calculate Voltage across load,
V=IRL,
2=1/50*100,
= 0.

Sathya said: (Feb 6, 2018)  
If it is AC supply then answer is 0.

Abdul Azeem said: (Sep 13, 2018)  
It only works A.C so the voltage across the lad is definitely zero.

Trilochan Mahapatra said: (Jun 23, 2019)  
The transformer will work on only A.C supply/source. But the battery will provide only D. C source & transformers don't act in D.C source.

Prasanna said: (Nov 23, 2019)  
We know that e=N(dflux/dt).

For dc supply flux is constant and derivative of constant is zero. So emf induced in secondary becomes zero i.e, e=0.

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