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When a given transformer is run at a its rated voltage but reduced frequency its
- a)flux density remains unaffected
- b)iron losses are reduced
- c)core flux density is reduced
- d)core flux density is increased
Correct answer is option 'D'. Can you explain this answer?
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When a given transformer is run at a its rated voltage but reduced fre...
Explanation:
When a given transformer is run at a reduced frequency but rated voltage, the following changes occur:
1. Core Flux Density is Increased: As the frequency of the power supply is reduced, the magnetic field generated in the transformer core also decreases. This results in a lower induced voltage in the secondary winding, which then causes a higher current to be drawn from the primary winding. This increased current flow causes an increase in the magnetic flux density in the core, which can lead to saturation of the core material.
2. Iron Losses are Increased: The iron losses in the transformer are caused by the hysteresis and eddy currents in the core material. As the frequency of the power supply is reduced, the hysteresis losses decrease, but the eddy current losses increase, which results in an overall increase in the iron losses.
3. Core Flux Density is Reduced: This option is incorrect. As explained above, the core flux density is increased when the transformer is run at a reduced frequency.
Therefore, the correct answer is option 'D'.
When a given transformer is run at a reduced frequency but rated voltage, the following changes occur:
1. Core Flux Density is Increased: As the frequency of the power supply is reduced, the magnetic field generated in the transformer core also decreases. This results in a lower induced voltage in the secondary winding, which then causes a higher current to be drawn from the primary winding. This increased current flow causes an increase in the magnetic flux density in the core, which can lead to saturation of the core material.
2. Iron Losses are Increased: The iron losses in the transformer are caused by the hysteresis and eddy currents in the core material. As the frequency of the power supply is reduced, the hysteresis losses decrease, but the eddy current losses increase, which results in an overall increase in the iron losses.
3. Core Flux Density is Reduced: This option is incorrect. As explained above, the core flux density is increased when the transformer is run at a reduced frequency.
Therefore, the correct answer is option 'D'.
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When a given transformer is run at a its rated voltage but reduced fre...
As we know B=(v/f)
if we decrease the frequency keeping voltage constant flux density increases
if we decrease the frequency keeping voltage constant flux density increases
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When a given transformer is run at a its rated voltage but reduced frequency itsa)flux density remains unaffectedb)iron losses are reducedc)core flux density is reducedd)core flux density is increasedCorrect answer is option 'D'. Can you explain this answer?
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