Exercise :: Power Electronics - Section 3
| 1. | In a dual converter both converters work as rectifiers. |
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Answer: Option B Explanation: One operators as rectifier and the other as inverter. |
| 2. | A single phase full wave regulator feeds R-L load. The best gating signal is |
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Answer: Option C Explanation: To ensure proper triggering pulse train in necessary because load is R - L. |
| 3. | A 3 phase induction motor is fed by a 3 phase ac regulator to change the stator voltage. The variation in speed will be more if |
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Answer: Option B Explanation: If load torque is constant, the change in speed is very small. |
| 4. | A cycloconverter cannot give a frequency higher than input frequency. |
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Answer: Option B Explanation: Step up cycloconverter can give a frequency higher than input frequency. |
| 5. | A thyristor has internal power dissipation of 40W and is operated at an ambient temperature of 20°C. If thermal resistance is 1.6° C/W, the junction temperature is |
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Answer: Option D Explanation:
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