General Knowledge - Physics - Discussion

Discussion Forum : Physics - Section 1 (Q.No. 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
the heating effect of current alone
hysteresis loss alone
both the heating effect of current and hysteresis loss
intense sunlight at noon
Answer: Option
No answer description is available. Let's discuss.
29 comments Page 1 of 3.

Swastika said:   1 decade ago
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.

Devan said:   9 years ago
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.

Ziyauddin khan said:   1 decade ago
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.

Vivek Pol said:   1 decade ago
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'.

Asha said:   1 decade ago
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.

Girja shanker sharma said:   1 decade ago
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.

Vivek said:   1 decade ago
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.

Gayatri prasad said:   1 decade ago
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.

Madhav said:   1 decade ago
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.

Nirakh Rastogi said:   1 decade ago
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.

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