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"Nothing in life is to be feared, it is only to be understood."
- Marie Curie

Large transformers, when used for some time, become very hot and are cooled by circulating oil. The heating of the transformer is due to

[A]. the heating effect of current alone
[B]. hysteresis loss alone
[C]. both the heating effect of current and hysteresis loss
[D]. intense sunlight at noon

Answer: Option


No answer description available for this question.

Vivek said: (Tue, Oct 12, 2010 02:42:21 AM)    
In alternating current a power dissipation due to heating effect p=i2R so heat is produce and eddy current produce in transformer also and they absorbed by circulating oil so heat produce due to both phenomenon.

Mansi Dixit said: (Wed, Mar 9, 2011 10:18:20 AM)    
What is hysteresis loss ?

Swathi said: (Wed, Jun 8, 2011 02:08:22 AM)    
Hysteresis loss is a heat loss caused by the magnetic properties of the armature.

Jatin Jain said: (Sun, Jul 17, 2011 06:56:32 AM)    
What is circulating oil?

Vivek Pol said: (Mon, Aug 29, 2011 07:23:29 PM)    
I think it so because hysteresis loss is the heat loss by magnetic properties of armature. And the main reason behind it is due to the heating effect of electric current alone. But the releted reason so found and therefore the answer is 'c'.

Ziyauddin Khan said: (Sat, Dec 24, 2011 11:50:03 AM)    
Hysteresis loss is due to repeated magnetisation and demagnetisation of the magnetic material. But it contributes a little in heat loss. Major heat loss is from heating effect of the circulting coil only. But the most appropriate answer is c.

Vivetha.H said: (Sat, May 12, 2012 06:33:30 PM)    
Large transformer becomes hot due to the high current and loss of the current

Gayatri Prasad said: (Tue, May 15, 2012 03:48:36 PM)    
In tronsformer their are 5 losses occures. Hystresis loss occures due to magnetisaion and demagnetisation of core placed in coil. Since coil is made by copper so their is also some loss due to coil.

Keerthana said: (Thu, Oct 18, 2012 09:22:29 PM)    
Large transformer become hot due to the high current and loss of the current.

Girja Shanker Sharma said: (Wed, Nov 21, 2012 02:56:39 AM)    
In a large transformer total current flow is-.
Current in secondary = current in primary - eddy current lose - hysteresis loss.
So we can say the heating of a transformer due to eddy current loss and hysteresis loss.

Aman said: (Mon, Feb 11, 2013 12:41:09 PM)    
What is armature?

Nirakh Rastogi said: (Fri, May 31, 2013 04:11:26 PM)    
Heating effect is also due to resistance of wire and it is equal to p=2ir where I is alternating current.

Hysteresis loss is due to the magnetisation and demagnetisation.

Sourabh said: (Mon, Jun 17, 2013 11:31:47 AM)    
T/f heating effect depends on frequency and voltage.

Madhav said: (Sun, Jun 30, 2013 08:33:21 AM)    
Armature means = the part of motor in which current is induced by a magnetic field. The armature usually consist of series of coils and groups of insulated conductors surrounding a core of iron.

Harish Reddy said: (Fri, Oct 25, 2013 10:49:52 PM)    
Both the heating effect of current and hysteresis loss.

Vrishal said: (Thu, Dec 26, 2013 01:09:17 PM)    
There is no machine in world that can be 100%used it energy to do work. So every machine losses the energy during working. How is expansion of transforming machine ti it?

Prachi said: (Wed, Jan 15, 2014 02:24:22 PM)    
What is armature?

Asha said: (Mon, Mar 10, 2014 09:49:39 PM)    
Hysteresis loss is created by magnetic core due to alternating flux linkage and the second loss is eddy current loss or current loss. When flux is created electron tends to flow current in the core tends to cause current leakage as heat.

Tabrez Alam said: (Sat, Apr 5, 2014 08:56:30 PM)    
Light is a wave and a particle why?

Swastika said: (Mon, Apr 7, 2014 11:09:24 AM)    
Yes, Light behaves as a wave and particle and it known as De-Broglie Wavelength ---> lamda = h/m*v.

Light behaves as a wave --->diffraction, reflection and refraction.

Light behaves as a particle-----> Compton effect and Photoelectric effect.

Suba said: (Mon, Aug 4, 2014 11:00:10 PM)    
What is transformer where they used?

Emmanuel said: (Tue, Sep 30, 2014 12:09:44 PM)    
A transformer is an electrical device for changing the size of an AC voltage. They are used to increase or decrease the emf of an alternating current.

Manish said: (Wed, Dec 10, 2014 04:12:06 PM)    
Copper windings has some resistance, current goes through the copper winding, resistance oppose the alternating current, so some heat are produce.

Devan said: (Tue, Apr 14, 2015 08:26:25 PM)    
There are several losses in transformer design the hysteresis loss is mainly due to alternative current which cause magnetic reversal at each cycle, the coercivity field is responsible for this. Joule's heating is also a factor in transformers.

Giri said: (Sat, Sep 19, 2015 04:59:28 PM)    
What is transformer?

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