Correct option is C
Magnetostriction is the phenomenon where a ferromagnetic material like the transformer's core expands and contracts slightly when subjected to a changing magnetic field, causing the audible hum.
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Question
The electric hum around a transformer is mainly attributed to-
Similar Questions
- 1)
What is the voltage regulation of a transformer while supplying a current of 10 A at 480 V, at a power factor of 0.8 lag , if the equivalent resistance and reactance of the transformer referred to the secondary of a single-phase transformer is 0.6Ω and 0.8Ω respectively?
- 2)
Which of the following is NOT correct with reference to delta-star type distribution transformers application?
- 3)In a transformer at full load, _________losses are zero.
- 4)
At 400 V and 50 Hz, the total core loss in a transformer is 2400 W. When the transformer is supplied at 200 V, 25 Hz, the core loss is 800 W. Find the hysteresis loss at 400 V, 50 Hz.
- 5)A ∆-∆ connected transformer is connected to V-V connected transformer. The ratio of VA rating of the V-V connected transformer and ∆-∆ connected transformer is:
- 6)
A 3300/250 V, 50 Hz transformer has 75 turns on low voltage winding. Find the number of turns on high voltage winding.
- 7)The electric hum around a transformer is mainly attributed to-
- 8)
1 kVA, 230 kVA, 50 Hz, single phase transformer has an eddy current loss of 30 W. The eddy current loss when the transformer is excited by a DC source of same voltage will be:
- 9)In a power transformer, copper losses occur in:
- 10)Magnetising impedance of a transformer is determined by:
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