There are both subjective and objective type questions in the Electrical Engineering optional subject for the UPSC exam. The subject is divided into different topics, and each topic can have a mix of subjective and objective questions. Let's delve into the details:

Subjective Type Questions:
1. Explain the working principle of a transformer.
- In this type of question, you need to provide a detailed explanation of the working principle of a transformer, including the concepts of electromagnetic induction, mutual inductance, and the step-up or step-down operation.

2. Discuss the advantages and disadvantages of three-phase power systems.
- Here, you will need to provide an analysis of the advantages and disadvantages of three-phase power systems, considering factors such as efficiency, voltage regulation, and cost.

3. Explain the operation of a synchronous machine.
- This question requires you to describe the operation of a synchronous machine, including the concept of rotor and stator fields, excitation, and synchronization.

Objective Type Questions:
1. Multiple Choice Questions (MCQs)
- These questions are designed to test your knowledge of various concepts in electrical engineering. For example:
- Which of the following is an insulating material? (a) Copper (b) Aluminum (c) Glass (d) Silver
- The unit of electrical resistance is (a) Ohm (b) Volt (c) Ampere (d) Watt

2. True/False Questions
- These questions assess your understanding of specific statements related to electrical engineering concepts. For example:
- True or False: Resistance in a series circuit is equal to the sum of individual resistances.
- True or False: A capacitor stores energy in the form of an electric field.

3. Fill in the Blanks
- These questions require you to complete a sentence or phrase with the appropriate term or concept. For example:
- The SI unit of electric current is ________.
- The power factor of an ideal inductor is ________.

In conclusion, the Electrical Engineering optional subject for the UPSC exam includes both subjective and objective type questions. Subjective questions require detailed explanations and analysis of concepts, while objective questions test your knowledge through MCQs, true/false statements, and fill in the blanks. It's important to have a thorough understanding of the subject and practice solving different types of questions to excel in this optional subject.