Practice portal › JEE › Alternating Current

AC Generator and Transformer for JEE: 16 solved questions

Real JEE paper questions on ac generator and transformer, part of alternating current. Each opens with the options, the correct answer and a step-by-step solution. Papers run from 2002 to 2025. No sign-in needed to read them.

What this topic asks

• Transformers — 10 questions
• AC generator, motors and devices — 6 questions

All 16 questions with solutions

• A motor operating on 100 V draws a current of 1 A. If the efficiency of the motor is 91.6%, the power lost is… JEE Main 3rd April 2nd Shift 2025
• A transformer of efficiency 80% works at 10 V and 4 kW. If the secondary voltage is 240 V, the secondary curr… JEE Main 1st Feb 2nd Shift 2024
• The primary of a transformer is connected to 230 V, 50 Hz with a primary-to-secondary turns ratio 10:1. A loa… JEE Main 27th Jan 2nd Shift 2024
• The primary of a transformer is connected to 220 V; the primary and secondary turns are 100 and 10. The secon… JEE Main 30th Jan 1st Shift 2024
• A transformer operating at primary voltage 8 kV and secondary voltage 160 V serves a load of 80 kW at unity p… JEE Main 28th July 2nd Shift 2022
• Match List-I with List-II. List-I: (A) AC generator, (B) Galvanometer, (C) Transformer, (D) Metal detector. L… JEE Main 25th June 1st Shift 2022
• For the circuit shown (see figure), with primary at 220 V and a secondary load of 60 W drawing i_L=0.11 A, co… JEE Main 16th March 2nd Shift 2021
• Match List-I with List-II. List-I: (A) Rectifier, (B) Stabilizer, (C) Transformer, (D) Filter. List-II: (i) u… JEE Main 25th Feb 2nd Shift 2021
• A transformer with 300 turns in the primary and 150 turns in the secondary gives an output power of 2.2 kW. I… JEE Main 10th April 1st Shift 2019
• A power line feeds input power at 2300 V to a step-down transformer (primary 4000 turns). The output is at 23… JEE Main 9th Jan 2nd Shift 2019
• In an a.c. generator a coil of N turns, all of area A and total resistance R, rotates with frequency ω in a m… AIEEE 2006
• The core of any transformer is laminated so as to AIEEE 2003
• In a transformer the primary has 140 turns and the secondary 280 turns. If the primary current is 4 A, the se… AIEEE 2002
• A power line feeds input power at 2.3 kV to a step-down transformer (primary 3000 turns). The output is deliv… JEE Main 30th Jan 2nd Shift 2024
• An ideal transformer with a purely resistive load operates at 12 kV on the primary and supplies energy at 120… JEE Main 6th April 1st Shift 2023
• In an a.c. generator a rectangular coil of 100 turns, each of area 14×10⁻² m², is rotated at 360 rev/min abou… JEE Main 30th Jan 2nd Shift 2023