General Knowledge - Physics - Discussion

Discussion :: Physics - Section 1 (Q.No.5)

5. 

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 C

Explanation:

No answer description available for this question.

Vivek said: (Oct 12, 2010)  
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: (Mar 9, 2011)  
What is hysteresis loss ?

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

Jatin Jain said: (Jul 17, 2011)  
What is circulating oil?

Vivek Pol said: (Aug 29, 2011)  
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: (Dec 24, 2011)  
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: (May 12, 2012)  
Large transformer becomes hot due to the high current and loss of the current

Gayatri Prasad said: (May 15, 2012)  
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: (Oct 18, 2012)  
Large transformer become hot due to the high current and loss of the current.

Girja Shanker Sharma said: (Nov 21, 2012)  
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: (Feb 11, 2013)  
What is armature?

Nirakh Rastogi said: (May 31, 2013)  
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: (Jun 17, 2013)  
T/f heating effect depends on frequency and voltage.

Madhav said: (Jun 30, 2013)  
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: (Oct 25, 2013)  
Both the heating effect of current and hysteresis loss.

Vrishal said: (Dec 26, 2013)  
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: (Jan 15, 2014)  
What is armature?

Asha said: (Mar 10, 2014)  
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: (Apr 5, 2014)  
Light is a wave and a particle why?

Swastika said: (Apr 7, 2014)  
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: (Aug 4, 2014)  
What is transformer where they used?

Emmanuel said: (Sep 30, 2014)  
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: (Dec 10, 2014)  
Copper windings has some resistance, current goes through the copper winding, resistance oppose the alternating current, so some heat are produce.

Devan said: (Apr 14, 2015)  
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: (Sep 19, 2015)  
What is transformer?

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