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The output power in step-up transformer used in practice 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 388
What is increased in step-down transformer?
 
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Physics Crash Course MHT-CET>Chapter 18 - Electromagnetic Induction>Exercise 1>Q 389
A transformer is used to light 100 W-110 V lamp from 220 V mains. If the main current is 0.5 A, the efficiency of the transformer is 
 
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Physics Crash Course MHT-CET>Chapter 18 - Electromagnetic Induction>Exercise 1>Q 390
An ideal transformer converts 220 V a.c. to 3.3 kV a.c. to transmit a power of 4.4 kW. If primary coil has 600 turns, then alternating current in secondary coil is
 
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Physics Crash Course MHT-CET>Chapter 18 - Electromagnetic Induction>Exercise 1>Q 391
A transformer connected to 220 V line shows an output of 2 A at 11000 volt. The efficiency is 100% . The current drawn from the line is
 
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Physics Crash Course MHT-CET>Chapter 18 - Electromagnetic Induction>Exercise 1>Q 392
A 220 V input is supplied to transformer. The output circuit draws a current of  2.0 A at 440 V. If the efficiency of the transformer is 80%, the current drawn by the primary windings of the transformer is 
 
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Physics Crash Course MHT-CET>Chapter 18 - Electromagnetic Induction>Exercise 1>Q 393

Assertion: A transformer cannot work on D.C. supply.

Reason: D.C. changes neither in magnitude nor in direction. 

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Physics Crash Course MHT-CET>Chapter 18 - Electromagnetic Induction>Exercise 1>Q 394
A step-down transformer has 50 turns on secondary and 1000 turns on primary winding. If a transformer is connected to 220 V,1 A A.C. source, what is output current of the transformer?
 
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Physics Crash Course MHT-CET>Chapter 18 - Electromagnetic Induction>Exercise 1>Q 395
A step-up transformer operates on a 230 V line and a load current of 2 A. The ratio of primary and secondary windings is 1:25. Then the current in the primary is: