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A generator has an e.m.f. of 440 V and internal resistance of 400 Ω. Its terminals are connected to a load of 4000 ohm. The voltage across the load is

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Important Questions on Electromagnetic Induction

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Physics Crash Course MHT-CET>Chapter 18 - Electromagnetic Induction>Exercise 1>Q 376
The primary winding of transformers has 500 turns whereas its secondary has 5000 turns. The primary is connected to an A.C. supply of 20 V,50 Hz. The secondary will have an output of
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Physics Crash Course MHT-CET>Chapter 18 - Electromagnetic Induction>Exercise 1>Q 377
In a transformer, np=500,ns=5000. Input voltage is 20 V and frequency is 50 Hz. Then in the output, we have
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Physics Crash Course MHT-CET>Chapter 18 - Electromagnetic Induction>Exercise 1>Q 378
The output voltage of a transformer connected to 220 V line is 1100 V at 2 A current. Its efficiency is 100 %. The current coming from the line is
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Physics Crash Course MHT-CET>Chapter 18 - Electromagnetic Induction>Exercise 1>Q 379
The turn ratio of transformers is given as 2 : 3. If the current through the primary coil is 3 A, calculate the current through load resistance.
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Physics Crash Course MHT-CET>Chapter 18 - Electromagnetic Induction>Exercise 1>Q 380
A transformer has 100 turns in the primary and 500 turns in the secondary. If the primary is connected to 220 V D.C. supply, then the voltage developed across the secondary will be, 
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Physics Crash Course MHT-CET>Chapter 18 - Electromagnetic Induction>Exercise 1>Q 381
In a transformer, 220 A.C. voltage is increased to 2200 V. If the number of turns in the secondary are 2000, then the number of turns in the primary will be,
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Physics Crash Course MHT-CET>Chapter 18 - Electromagnetic Induction>Exercise 1>Q 382
A loss-free transformer has 500 turns on its primary winding and 2500 in secondary. The meters of the secondary indicate 200 V at 8 A under these conditions. The voltage and current in the primary is,
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Physics Crash Course MHT-CET>Chapter 18 - Electromagnetic Induction>Exercise 1>Q 383
A step-down transformer is connected to 2400 V line and 80 A of current is found to flow in output load. The ratio of the turns in primary and secondary coil is 20:1. If transformer efficiency is 100%, then the current flowing in primary coil will be,