In the Electrical Engineering optional subject paper of the UPSC exam, there are typically a total of 8 questions. These questions are designed to assess the candidate's knowledge and understanding of various aspects of electrical engineering.

Below is a detailed explanation of the number and types of questions asked in the Electrical Engineering optional subject paper:

1. Short Answer Questions:
- The paper usually begins with a few short answer questions (SAQs), which require concise and specific answers.
- These questions test the fundamental concepts and theories of electrical engineering.
- There are usually 2 to 3 SAQs in the paper.

2. Numerical Problems:
- The paper includes a significant number of numerical problems that test the candidate's ability to apply mathematical and analytical skills to solve electrical engineering problems.
- These problems often require calculations involving formulas, equations, and concepts related to circuit analysis, electromagnetism, power systems, control systems, etc.
- Approximately 3 to 4 numerical problems are asked in the paper.

3. Descriptive Questions:
- The paper also includes descriptive questions that require candidates to explain concepts, theories, principles, and applications of various electrical engineering topics.
- These questions test the candidate's understanding, analytical thinking, and ability to articulate their knowledge effectively.
- The descriptive questions may cover topics such as power electronics, electrical machines, signal processing, digital electronics, etc.
- Usually, there are 2 to 3 descriptive questions in the paper.

4. Application-Based Questions:
- In order to assess the candidate's ability to apply theoretical knowledge to real-world scenarios, the paper may include application-based questions.
- These questions present practical situations or problems related to electrical engineering and require the candidate to suggest appropriate solutions or strategies.
- The application-based questions may cover areas such as power systems planning, control system design, electrical network analysis, etc.
- Typically, there are 1 to 2 application-based questions in the paper.

In conclusion, the Electrical Engineering optional subject paper of the UPSC exam consists of a total of 8 questions. These questions include short answer questions, numerical problems, descriptive questions, and application-based questions, which collectively assess the candidate's knowledge, understanding, analytical skills, and real-world application of electrical engineering concepts and theories.