Electronics and Communication Engineering - Power Electronics
Exercise : Power Electronics - Section 3
1.
In a dual converter both converters work as rectifiers.
Answer: Option
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
Answer: Option
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
Answer: Option
Explanation:
If load torque is constant, the change in speed is very small.
4.
A cycloconverter cannot give a frequency higher than input frequency.
Answer: Option
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
Answer: Option
Explanation:
.
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