Discussion
An SCR is rated for 650 V PIV. What is the voltage up to which the device can be operated if the voltage safety factor is 2 ?
Answer: A
The device can be operated up to about 230 V.
The voltage safety factor is the ratio of the PIV rating to the peak working voltage. With a factor of 2, the peak working voltage is half the rating, and for a sinusoidal supply the rms value is the peak divided by \(\sqrt{2}\).
\[ \begin{aligned} V_{m} &= \frac{650}{2} = 325\ \text{V} \\ V_{rms} &= \frac{325}{\sqrt{2}} \approx 229.8 \approx 230\ \text{V} \end{aligned} \]
325 V is the permissible peak, not the supply voltage rating, and 459 V is \(650/\sqrt{2}\), which ignores the safety factor. 650 V would leave no margin at all.
Post your comment
Please log in or register to post a comment.
Examination Categories
- SSC Exams
- Banking Exams
- Teaching Exams
- Civil Services Exams
- Railways Exams
- Engineering Recruitment Exams
- Defence Exams
- State Government Exams
- Police Exams
- Insurance Exams
- Nursing Exams
- Other Government Exams
- NRA CET
- PG Entrance Exams
- Campus Placement
- MBA Entrance Exams
- CUET and UG Entrance
- Judiciary Exams
- Regulatory Body Exams
- Software Development