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प्रश्न
A step-down transformer reduces the supply voltage from 220 V to 11 V and increase the current from 6 A to 100 A. Then its efficiency is
विकल्प
1.2
0.83
0.12
0.9
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उत्तर
0.83
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संबंधित प्रश्न
Why is the iron core of a transformer made laminated (thin sheets) instead of being in one solid piece?
Describe briefly and two energy losses, giving the reasons for their occurrence in actual transformers ?
Why is the core of a transformer made of soft iron?
State the mathematical relation between a number of turns in the primary coil to a secondary coil in the step-up transformer.
Describe the construction and working of a transformer with a neat labelled diagram.
In a series resonant RLC circuit, the voltage across 100 Ω resistor is 40 V. The resonant frequency ω is 250 rad/s. If the value of C is 4 µF, then the voltage across L is
What are step-up and step-down transformers?
Mention the various energy losses in a transformer.
The 300 turn primary of a transformer has resistance 0.82 Ω and the resistance of its secondary of 1200 turns is 6.2 Ω. Find the voltage across the primary if the power output from the secondary at 1600V is 32 kW. Calculate the power losses in both coils when the transformer efficiency is 80%
The line that draws power supply to your house from street has ______.
- zero average current.
- 220 V average voltage.
- voltage and current out of phase by 90°.
- voltage and current possibly differing in phase `phi` such that `|phi| < pi/2`.
