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.
Question 1
10 May 2023 S2
9A 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 beTap an option to check your answer.
Question 2
11 May 2023 S2
21The 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 isTap an option to check your answer.
Question 3
13 May 2024 S2
11The 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 beTap an option to check your answer.
Question 4
20 Apr 2025 S2
34An 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 isTap an option to check your answer.
Question 5
23 Apr 2025 S1
34A 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 of power is lost, then the current in the secondary coil will beTap an option to check your answer.
Question 6
11 Apr 2026 S2
138An ideal transformer converts V a.c. to KV a.c. to transmit a power of KW. If primary coil has turns then alternating current in the secondary coil isTap an option to check your answer.
Question 7
16 Apr 2026 S1
139A step down transformer has turns ratio 20:1. If 8V are applied across secondary then the primary current will beTap an option to check your answer.
Question 8
17 Apr 2026 S1
138A 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 beTap an option to check your answer.
Question 9
20 Apr 2026 S2
140A 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 beTap an option to check your answer.
Question 10
19 May 2026 S1
139A transformer having an efficiency 80% is working on V and kW power supply. If the current in the secondary coil is A, the voltage across the secondary coil and the current in the primary coil, respectively, areTap an option to check your answer.