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Transformer: secondary voltage or current from turns ratio, power and efficiency

This type of question, asked 5 times: 3 May 2023 S1, 3 May 2023 S2, 13 May 2026 S1, 13 May 2026 S2, 14 May 2026 S2. All 5 questions below, oldest first.

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  1. Question 1

    3 May 2023 S1

    34
    A transformer having efficiency 90% is working on 200 V and 3 kW power supply. If the current in the secondary coil is 6 A, the voltage across the secondary coil and the current in the primary coil are respectively

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  2. Question 2

    3 May 2023 S2

    16
    A transformer is used to set up an alternating e.m.f. of 220 V to 4.4 kV to transmit 6.6 kW of power. The primary coil has 1000 turns. The current rating of the secondary coil is (Transformer is ideal)

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  3. Question 3

    13 May 2026 S1

    139
    A transformer having efficiency 90%90\% is working on 200200 V and 33 KW power supply. If the current in the secondary coil is 6A, the voltage across the secondary coil and the current in the primary coil, respectively, are

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  4. Question 4

    13 May 2026 S2

    136
    A step down transformer has 5050 turns on secondary and 10001000 turns on primary winding. If a transformer is connected to 220220 V and 11 A a.c. source, what is the output current of the transformer?

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  5. Question 5

    14 May 2026 S2

    139
    A current of 55 A is flowing at 220220 V in the primary coil of a transformer. If the voltage produced in the secondary coil is 22002200 V and 50%50\% of power is lost, then the current in secondary will be

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