Electronics and Communication Engineering - Power Electronics
Exercise :: Power Electronics - Section 6
| 1. |
In a single phase full wave ac regulator feeding R-L load, the gate pulses |
| A. |
are always of short duration | | B. |
may be of short duration | | C. |
should be rectangular with width (p - a) | | D. |
cannot be rectangular with width (p - a) |
Answer: Option C
Explanation:
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| 2. |
In a semi converter feeding a resistive load, |
| A. |
the waveshapes of input voltage and input current are always similar | | B. |
the waveshapes of input voltage and input current can never be similar | | C. |
the waveshapes of input voltage and input current are similar only if firing angle is zero | | D. |
the waveshapes of input voltage and input current are similar only if firing angle is high |
Answer: Option C
Explanation:
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| 3. |
In a single phase semi-converter the number of thyristors is |
Answer: Option D
Explanation:
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| 4. |
A dc chopper is feeding an RLE load. The current can become discontinuous if |
| A. |
 is high | | B. |
a is low | | C. |
E is high | | D. |
none of the above |
Answer: Option D
Explanation:
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| 5. |
Which of these commutation methods uses two leads? |
| A. |
Class A | | B. |
Class B | | C. |
Class C | | D. |
Class D |
Answer: Option D
Explanation:
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