- 1(current)
Q. No.A step-up transformer is connected to an AC mains supply of \(220~\text V\) to operate at \(11000~\text V, 88~\text W.\) The current in the secondary circuit, ignoring the power loss in the transformer, is:
1. \(8~\text{mA}\)
2. \(4~\text{mA}\)
3. \(0.4~\text{A}\)
4. \(4~\text{A}\)
1. \(8~\text{mA}\)
2. \(4~\text{mA}\)
3. \(0.4~\text{A}\)
4. \(4~\text{A}\)
Subtopic: Â Transformer |
 64%
From NCERT
NEET - 2024
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In the transformer shown in the figure, the ratio of the number of turns of the primary to the secondary is \(\dfrac{N_1}{N_2}= \dfrac{1}{50}.\) If a voltage source of \(10~\text V\) is connected across the primary, then the induced current through the load of \(10~\text{k}\Omega\) in the secondary is:
1. \(\dfrac{1}{20}~\text{A}\)
2. zero
3. \(\dfrac{1}{10}~\text{A}\)
4. \(\dfrac{1}{5}~\text{A}\)
1. \(\dfrac{1}{20}~\text{A}\)
2. zero
3. \(\dfrac{1}{10}~\text{A}\)
4. \(\dfrac{1}{5}~\text{A}\)
Subtopic: Â Transformer |
 74%
From NCERT
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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 |
 73%
From NCERT
NEET - 2023
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The core of a transformer is laminated to reduce energy losses due to
1. Eddy currents
2. Hysteresis
3. Resistance in winding
4. None of these
Subtopic: Â Transformer |
 82%
From NCERT
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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 |
 70%
From NCERT
NEET - 2021
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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
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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 |
 88%
From NCERT
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A transformer with \(8:1\) turns ratio has \(50~\text{Hz},\) \(100~\text V\) 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 |
 78%
From NCERT
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A transformer has an efficiency of \(90\%\) working on \(200~\text V\) and \(3~\text{kW}\) power supply. If the current in the secondary coil is \(6~\text A,\) the voltage across the secondary coil and the current in the primary coil, respectively, are:
1. \(300~\text V,~15~\text A\)
2. \(450~\text V,~15~\text A\)
3. \(450~\text V,~13.5~\text A\)
4. \(600~\text V,~15~\text A\)
1. \(300~\text V,~15~\text A\)
2. \(450~\text V,~15~\text A\)
3. \(450~\text V,~13.5~\text A\)
4. \(600~\text V,~15~\text A\)
Subtopic: Â Transformer |
 77%
From NCERT
AIPMT - 2014
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- 1(current)
Q. No.
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