Q. No.The core of a transformer is laminated because:
| 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. | Ratio of voltage in primary and secondary may be increased |
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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. | \(0.5~\text{A}\) |
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| 1. | \(120\) V | 2. | \(220\) V |
| 3. | \(30\) V | 4. | \(90\) V |
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| 1. | \(200\) V, \(50\) Hz |
| 2. | \(2\) V, \(50\) Hz |
| 3. | \(200\) V, \(500\) Hz |
| 4. | \(2\) V, \(5\) Hz |
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1. \(5000\)
2. \(50\)
3. \(500\)
4. \(5\)
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In a step-up transformer, the turn ratio is \(1:20\). The resistance of \(100~\Omega\) connected across the secondary is drawing a current of \(2~\text{A}\).
What are the primary voltage and current respectively?
1. \(100~\text{V}, 0.5~\text{A}\)
2. \(200~\text{V},10~\text{A}\)
3. \(10~\text{V}, 40~\text{A}\)
4. \(10~\text{V}, 20~\text{A}\)
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| 1. | \(1600\) A | 2. | \(20\) A |
| 3. | \(4\) A | 4. | \(1.5\) A |
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1. \(\dfrac{1}{20}~\text{A}\)
2. zero
3. \(\dfrac{1}{10}~\text{A}\)
4. \(\dfrac{1}{5}~\text{A}\)
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1. \(3.6\) A
2. \(2.8\) A
3. \(2.5\) A
4. \(5.0\) A
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1. \(300\) V, \(15\) A
2. \(450\) V, \(15\) A
3. \(450\) V, \(13.5\) A
4. \(600\) V, \(15\) A
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