- 1(current)
Q. No.A power transmission line feeds input power at \(2300~\text{V}\) to a step down transformer with its primary windings having \(4000\) turns giving the output power at \(230~\text{V}.\) If the current in the primary of the transformer is \( 5~\text A\) and its efficiency is \(90\%,\) the output current would be:
1. \(45~\text A\)
2. \(50~\text A\)
3. \(20~\text A\)
4. \(25~\text A\)
1. \(45~\text A\)
2. \(50~\text A\)
3. \(20~\text A\)
4. \(25~\text A\)
Subtopic: Transformer |
80%
Level 1: 80%+
Please attempt this question first.
Hints
Please attempt this question first.
A transformer consisting of \(300\) turns in the primary and \(150\) turns in the secondary gives output power of \(2.2~\text{kW}.\) If the current in the secondary coil is \(10~\text{A},\) then the input voltage and current in the primary coil are:
1. \(440~\text{V}~\text{and}~20~\text{A}\)
2. \(440~\text{V}~\text{and}~5~\text{A}\)
3. \(220~\text{V}~\text{and}~20~\text{A}\)
4. \(220~\text{V}~\text{and}~10~\text{A}\)
Subtopic: Transformer |
85%
Level 1: 80%+
JEE
Please attempt this question first.
Hints
Please attempt this question first.
A power transmission line feeds \(2300~\text{V}\) to the primary of a step-down transformer with \(4000\) turns. The transformer delivers an output voltage of \(230 ~\text{V},\) and the current in the primary is \(5~\text{A}.\) If the transformer operates at \(90\%\) efficiency, what is the current in the secondary winding?
| 1. | \(50~\text{A}\) | 2. | \(45~\text{A}\) |
| 3. | \(35~\text{A}\) | 4. | \(25~\text{A}\) |
Subtopic: Transformer |
85%
Level 1: 80%+
Please attempt this question first.
Hints
Please attempt this question first.
Match List-I with List-II.
Choose the correct answer from the options given below:
| List-I | List-II | ||
| (A) | AC generator | (I) | detects the presence of current in the circuit |
| (B) | Galvanometer | (II) | converts mechanical energy into electrical energy |
| (C) | Transformer | (III) | works on the principle of resonance in AC circuits |
| (D) | Metal detector | (IV) | changes an alternating voltage for a smaller or greater value |
| 1. | \(\mathrm{(A)-(II), B-(I), (C)-(IV), (D)-(III)}\) |
| 2. | \(\mathrm{(A)-(II), B-(I), (C)-(III), (D)-(IV)}\) |
| 3. | \(\mathrm{(A)-(III), B-(IV), (C)-(II), (D)-(I)}\) |
| 4. | \(\mathrm{(A)-(III), B-(I), (C)-(II), (D)-(IV)} \) |
Subtopic: Transformer |
71%
Level 2: 60%+
Please attempt this question first.
Hints
Please attempt this question first.
If the primary side of a transformer is connected with \(230~\text{V},~50~\text{Hz}~\text{AC}\) supply and the ratio of the number of turns of primary to the secondary winding is \(10:1.\) The load resistance at the secondary coil is \(46~\Omega\), then the power output of the secondary windings is:
1. \(11.5~\text{watt}\)
2. \(13~\text{watt}\)
3. \(16~\text{watt}\)
4. \(15.6~\text{watt}\)
1. \(11.5~\text{watt}\)
2. \(13~\text{watt}\)
3. \(16~\text{watt}\)
4. \(15.6~\text{watt}\)
Subtopic: Transformer |
87%
Level 1: 80%+
JEE
Please attempt this question first.
Hints
Please attempt this question first.
For the given circuit, comment on the type of transformer used.
| 1. | step-down transformer |
| 2. | auxiliary transformer |
| 3. | step-up transformer |
| 4. | auto transformed |
Subtopic: Transformer |
Please attempt this question first.
Hints
An ideal transformer has \(100\) turns on its primary coil, across which \(220 ~\text V\) is applied. The secondary coil has \(10\) turns and is connected in series with a \(2~ \Omega\) resistor and a \(3~ \Omega\) resistor. What is the current through the \(3~ \Omega\) resistor?
| 1. | \(4~\text A\) | 2. | \(4.4~\text A\) |
| 3. | \(2~\text A\) | 4. | \(2.2~\text A\) |
Subtopic: Transformer |
81%
Level 1: 80%+
Please attempt this question first.
Hints
Please attempt this question first.
The efficiency of a transformer is \(80\%.\) The input voltage is \(10~\text{volts}\) and input power is \(4~\text{kW}.\) Then the output current if the output voltage is \(240~\text{volts}\) is:
1. \(\dfrac{40}{3}~\text A\)
2. \(\dfrac{20}{3}~\text A\)
3. \(\dfrac{20}{7}~\text A\)
4. \(\dfrac{10}{3}~\text A\)
1. \(\dfrac{40}{3}~\text A\)
2. \(\dfrac{20}{3}~\text A\)
3. \(\dfrac{20}{7}~\text A\)
4. \(\dfrac{10}{3}~\text A\)
Subtopic: Transformer |
Please attempt this question first.
Hints
A transformer operating at a primary voltage of \(8\) kV and secondary voltage of \(160\) V serves a load of \(80\) kW. Assuming the transformer to be ideal with purely resistive load and working on unity power factor, the loads in the primary and secondary circuit would be:
| 1. | \(800~\Omega\) and \(1.06~\Omega\) | 2. | \(10~\Omega\) and \(500~\Omega\) |
| 3. | \(800~\Omega\) and \(0.32~\Omega\) | 4. | \(1.06~\Omega\) and \(500~\Omega\) |
Subtopic: Transformer |
80%
Level 1: 80%+
Please attempt this question first.
Hints
Please attempt this question first.
- 1(current)
Q. No.
© 2026 GoodEd Technologies Pvt. Ltd.