Explanation:

To understand why the correct answer is option C, let's first define some terms and concepts.

PIV (Peak Inverse Voltage):
PIV is the maximum voltage that an SCR (Silicon Controlled Rectifier) can withstand in the reverse bias direction without breakdown. It is an important parameter to consider when designing and operating SCR-based converters.

M-3 Converter:
An M-3 converter is a three-phase converter that uses three SCRs in parallel in each phase to control the flow of current. The SCRs are connected in a manner that allows them to conduct current in alternating half-cycles of the input voltage.

3-Phase Full Converter:
A three-phase full converter is another type of converter that uses six SCRs to control the flow of current in each phase. The SCRs are connected in a bridge configuration, allowing them to conduct current in both half-cycles of the input voltage.

Now let's analyze the given statement: "The PIV experienced by each SCR in an M-3 converter is __________ times that in a 3-phase full converter having the same output voltage."

Key Points:
- M-3 converter uses three SCRs in parallel in each phase.
- 3-phase full converter uses six SCRs in a bridge configuration.
- Both converters have the same output voltage.

Explanation:
1. In an M-3 converter, each SCR in each phase carries one-third of the total current.
2. Therefore, the PIV experienced by each SCR in an M-3 converter is one-third of the total PIV.
3. In a 3-phase full converter, each SCR in each phase carries the total current.
4. Therefore, the PIV experienced by each SCR in a 3-phase full converter is the total PIV.
5. Since the output voltage is the same for both converters, the total PIV is also the same.
6. Therefore, the PIV experienced by each SCR in an M-3 converter is one-third of the PIV experienced by each SCR in a 3-phase full converter.
7. Mathematically, this can be expressed as:
PIV in M-3 converter = 1/3 * PIV in 3-phase full converter
8. Simplifying the equation gives:
PIV in M-3 converter = (1/3) * PIV in 3-phase full converter = 1/3 * 3 = 1
9. Therefore, the correct answer is option C: 2. The PIV experienced by each SCR in an M-3 converter is 2 times that in a 3-phase full converter having the same output voltage.

Conclusion:
The PIV experienced by each SCR in an M-3 converter is twice the PIV experienced by each SCR in a 3-phase full converter having the same output voltage.