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: Transformer |
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A transformer is used to light a and lamp from a main. If the main current is , the efficiency of the transformer is approximately:
1.
2.
3.
4.
Subtopic: Transformer |
74%
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AIPMT - 2007
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A transformer operating at a primary voltage of kV and secondary voltage of V serves a load of 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. | and | 2. | and |
| 3. | and | 4. | and |
Subtopic: Transformer |
81%
From NCERT
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A transformer has an efficiency of It works at kW and V. If the secondary voltage is V, the current in the secondary coil is nearly:
1. A
2. A
3. A
4. A
1. A
2. A
3. A
4. A
Subtopic: Transformer |
88%
From NCERT
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Subtopic: Transformer |
77%
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In an ideal transformer, the number of turns in primary and secondary coils are and respectively. If the current in the primary coil is then the current in the secondary coil will be:
1.
2.
3.
4.
1.
2.
3.
4.
Subtopic: Transformer |
88%
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A step-down transformer connected to an AC mains supply of is made to operate at lamp. Ignoring power losses in the transformer, what is the current in the primary circuit?
1.
2.
3.
4.
1.
2.
3.
4.
Subtopic: Transformer |
69%
From NCERT
NEET - 2021
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An ideal transformer has turns in the primary coil and carries a A current. To achieve a V output with a kW power output, the number of turns in the secondary coil must be:
1.
2.
3.
4.
1.
2.
3.
4.
Subtopic: Transformer |
84%
From NCERT
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A lamp is connected to the secondary of a step-down transformer, whose primary is connected to AC mains of . Assuming the transformer to be ideal, what is the current in the primary winding?
1.
2.
3.
4.
1.
2.
3.
4.
Subtopic: Transformer |
72%
From NCERT
NEET - 2023
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A power transmission line feeds input power at to a step-down transformer with its primary windings having turns. What should be the number of turns in the secondary in order to get output power at
1.
2.
3.
4.
Subtopic: Transformer |
79%
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