PYQ Vault

Transformer: turns, voltages, currents and power loss

This type of question, asked 10 times: 10 May 2023 S2, 11 May 2023 S2, 13 May 2024 S2, 20 Apr 2025 S2, 23 Apr 2025 S1, 11 Apr 2026 S2, 16 Apr 2026 S1, 17 Apr 2026 S1, 20 Apr 2026 S2, 19 May 2026 S1. All 10 questions below, oldest first.

Try each one first, then open its answer.

  1. Question 1

    10 May 2023 S2

    9
    A transformer has 120 turns in the primary coil and carries 5 A current. Input power is one kilowatt. To have 560 V output, the number of turns in secondary coil will be

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  2. Question 2

    11 May 2023 S2

    21
    The number of turns in the primary of a transformer are 1000 and in secondary 3000. If 80 V a.c. is applied to the primary, the potential difference per turn of the secondary coil is

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  3. Question 3

    13 May 2024 S2

    11
    The number of turns in the primary and the secondary of a transformer are 1000 and 3000 respectively. If 80 V a.c. is applied to the primary coil of the transformer, then the potential difference per turn of the secondary coil would be

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  4. Question 4

    20 Apr 2025 S2

    34
    An ideal transformer converts 220 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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  5. Question 5

    23 Apr 2025 S1

    34
    A current of 5 A is flowing at 220 V in a primary coil of a transformer. If the voltage produced in the secondary coil is 2200 V and 50%50\% of power is lost, then the current in the secondary coil will be

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  6. Question 6

    11 Apr 2026 S2

    138
    An ideal transformer converts 220220V a.c. to 3.33.3 KV a.c. to transmit a power of 4.44.4 KW. If primary coil has 600600 turns then alternating current in the secondary coil is

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  7. Question 7

    16 Apr 2026 S1

    139
    A step down transformer has turns ratio 20:1. If 8V are applied across 0.4 Ω0.4\,\Omega secondary then the primary current will be

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  8. Question 8

    17 Apr 2026 S1

    138
    A transformer has 120 turns in the primary coil and carries 5A current. Input power is one kilowatt. To have 560 V output, the number of turns in secondary coil will be

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  9. Question 9

    20 Apr 2026 S2

    140
    A current of 4 A is flowing at 230 V in the primary coil of a transformer. If the voltage produced in the secondary coil is 2300 V and 40 % of power is lost, then the current in the secondary will be

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  10. Question 10

    19 May 2026 S1

    139
    A transformer having an efficiency 80% is working on 200200 V and 44 kW power supply. If the current in the secondary coil is 55 A, the voltage across the secondary coil and the current in the primary coil, respectively, are

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