Q. No.Electrical energy is transmitted over large distances at high alternating voltages. Which of the following statements is (are) correct?
Choose the correct options:
| (a) | For a given power level, there is a lower current. |
| (b) | Lower current implies less power loss. |
| (c) | Transmission lines can be made thinner. |
| (d) | It is easy to reduce the voltage at the receiving end using step-down transformers. |
| 1. | (a), (b), (c) | 2. | (a), (b), (d) |
| 3. | (b), (c), (d) | 4. | (c), (d) |
Subtopic: Â Transformer |
 59%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
A transformer is used to light a \(100~\text{W}\) and \(110~\text{V}\) lamp from a \(220~\text{V}\) main. If the main current is \(0.5~\text{A}\), the efficiency of the transformer is approximately:
1. \(30\%\)
2. \(50\%\)
3. \(90\%\)
4. \(10\%\)
Subtopic: Â Transformer |
 73%
From NCERT
AIPMT - 2007
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
Links
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
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: Â Transformer |
 81%
From NCERT
Please attempt this question first.
Hints
Please attempt this question first.
A transformer has an efficiency of \(80\text{%}.\) It works at \(40\) kW and \(100\) V. If the secondary voltage is \(240\) V, the current in the secondary coil is nearly:
1. \(40\) A
2. \(133.3\) A
3. \(86.7\) A
4. \(112\) A
1. \(40\) A
2. \(133.3\) A
3. \(86.7\) A
4. \(112\) A
Subtopic: Â Transformer |
 87%
From NCERT
Please attempt this question first.
Hints
Please attempt this question first.
A transformer with \(8:1\) turns ratio has \(50~\text{Hz}\), \(100\) V input. The frequency of the output is:
1. \(40~\text{Hz}\)
2. \(50~\text{Hz}\)
3. \(400~\text{Hz}\)
4. \(500~\text{Hz}\)
1. \(40~\text{Hz}\)
2. \(50~\text{Hz}\)
3. \(400~\text{Hz}\)
4. \(500~\text{Hz}\)
Subtopic: Â Transformer |
 77%
From NCERT
Please attempt this question first.
Hints
Please attempt this question first.
In an ideal transformer, the number of turns in primary and secondary coils are \(500\) and \(2000\) respectively. If the current in primary coil is \(48~\text{A}\), then current in the secondary coil will be:
| 1. | \(12~\text{A}\) | 2. | \(24~\text{A}\) |
| 3. | \(48~\text{A}\) | 4. | \(144~\text{A}\) |
Subtopic: Â Transformer |
 89%
Please attempt this question first.
Hints
Please attempt this question first.
A step-down transformer connected to an AC mains supply of \(220~\text{V}\) is made to operate at \(11~\text{V}\), \(44~\text{W}\) lamp. Ignoring power losses in the transformer, what is the current in the primary circuit?
1. \(2~\text{A}\)
2. \(4~\text{A}\)
3. \(0.2~\text{A}\)
4. \(0.4~\text{A}\)
1. \(2~\text{A}\)
2. \(4~\text{A}\)
3. \(0.2~\text{A}\)
4. \(0.4~\text{A}\)
Subtopic: Â Transformer |
 67%
From NCERT
NEET - 2021
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
Links
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
An ideal transformer has \(100\) turns in the primary coil and carries \(5\) A current, the number of turns in the secondary coil to have \(1600\) V, \(2\) kW output will be:
1. \(100\)
2. \(200\)
3. \(300\)
4. \(400\)
1. \(100\)
2. \(200\)
3. \(300\)
4. \(400\)
Subtopic: Â Transformer |
 91%
From NCERT
Please attempt this question first.
Hints
Please attempt this question first.
A \(12~\text{V},60~\text{W}\) lamp is connected to the secondary of a step down transformer, whose primary is connected to ac mains of \(220~\text{V}\). Assuming the transformer to be ideal, what is the current in the primary winding?
1. \(0.37~\text{A}\)
2. \(0.27~\text{A}\)
3. \(2.7~\text{A}\)
4. \(3.7~\text{A}\)
1. \(0.37~\text{A}\)
2. \(0.27~\text{A}\)
3. \(2.7~\text{A}\)
4. \(3.7~\text{A}\)
Subtopic: Â Transformer |
 69%
From NCERT
NEET - 2023
Please attempt this question first.
Hints
Please attempt this question first.
A power transmission line feeds input power at \(2300\) V to a step-down transformer with its primary windings having \(4000\) turns. What should be the number of turns in the secondary in order to get output power at \(230\) V?
1. \(200\)
2. \(250\)
3. \(350\)
4. \(400\)
Subtopic: Â Transformer |
 79%
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
Links
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
© 2024 GoodEd Technologies Pvt. Ltd.