- 1(current)
Q. No.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. \(0.37 ~\mathrm{A}\)
2. \(0.27 ~\mathrm{A}\)
3. \(2.7 ~\mathrm{A}\)
4. \(3.7 ~\mathrm{A}\)
1. \(0.37 ~\mathrm{A}\)
2. \(0.27 ~\mathrm{A}\)
3. \(2.7 ~\mathrm{A}\)
4. \(3.7 ~\mathrm{A}\)
Subtopic: Â Transformer |
 69%
From NCERT
NEET - 2023
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 |
 66%
From NCERT
NEET - 2021
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
Links
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
A transformer has an efficiency of \(90\)% working on \(200\) V and \(3\) kW power supply. If the current in the secondary coil is \(6\) A, the voltage across the secondary coil and the current in the primary coil, respectively, are:
1. \(300\) V, \(15\) A
2. \(450\) V, \(15\) A
3. \(450\) V, \(13.5\) A
4. \(600\) V, \(15\) A
1. \(300\) V, \(15\) A
2. \(450\) V, \(15\) A
3. \(450\) V, \(13.5\) A
4. \(600\) V, \(15\) A
Subtopic: Â Transformer |
 77%
From NCERT
AIPMT - 2014
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
A \(220\) V input is supplied to a transformer. The output circuit draws a current of \(2.0\) A at \(440\) V. If the efficiency of the transformer is \(80\)%, the current drawn by the primary windings of the transformer is:
1. \(3.6\) A
2. \(2.8\) A
3. \(2.5\) A
4. \(5.0\) A
Subtopic: Â Transformer |
 78%
From NCERT
AIPMT - 2010
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
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 2023 - Target Batch - Aryan Raj Singh
Hints
Links
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
The core of a transformer is laminated so that:
| 1. | energy losses due to eddy currents may be minimized |
| 2. | the weight of the transformer may be reduced |
| 3. | rusting of the core may be prevented |
| 4. | the ratio of voltage in primary and secondary may be increased |
Subtopic: Â Transformer |
 84%
From NCERT
AIPMT - 2006
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
Links
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Turn ratio of a step-up transformer is \(1: 25\). If current in load coil is \(2~\text{A}\), then the current in primary coil will be:
| 1. | \(25~\text{A}\) | 2. | \(50~\text{A}\) |
| 3. | \(0.25~\text{A}\) | 4. | \(0.5~\text{A}\) |
Subtopic: Â Transformer |
 88%
From NCERT
AIPMT - 1998
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
Links
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
- 1(current)
Q. No.
© 2024 GoodEd Technologies Pvt. Ltd.