Which of the following device is used to remove over 99% particulate matter present in the exhaust from a thermal power plant?
1)Electrostatic precipitator
2) Scrubber
3) Catalytic convertor
4) Trajectory separator

Options

A. Electrostatic precipitator
B. Scrubber
C. Catalytic convertor
D. Trajectory separator

Answer

To solve the question regarding which device is used to remove over 99% particulate matter present in the exhaust from a thermal power plant, we can follow these steps:

### Step 1: Understand the Context
Recognize that thermal power plants emit exhaust that contains particulate matter, which is harmful to the environment and human health. Therefore, it is essential to have a device that can effectively remove this particulate matter from the exhaust.

**Hint:** Think about the types of devices commonly used in industrial settings for air purification.

### Step 2: Analyze the Options
Look at the provided options:
1. Electrostatic precipitator
2. Scrubber
3. Catalytic converter
4. Trajectory separator

**Hint:** Consider the primary function of each device listed in the options.

### Step 3: Evaluate Each Device
- **Electrostatic Precipitator:** This device is specifically designed to remove particulate matter from exhaust gases. It works by charging the particles and attracting them to oppositely charged plates, effectively removing them from the air.

- **Scrubber:** Scrubbers are used to remove gases and vapors, not solid particulate matter. They typically use liquid to capture pollutants.

- **Catalytic Converter:** This device is used in vehicles to convert harmful gases into less harmful emissions. It does not primarily target particulate matter.

- **Trajectory Separator:** This device uses magnetic fields to separate materials, but it is not suitable for removing particulate matter from exhaust gases in thermal power plants.

**Hint:** Focus on the effectiveness of each device in removing particulate matter specifically.

### Step 4: Identify the Correct Answer
Based on the analysis, the **Electrostatic Precipitator** is the device that can remove over 99% of particulate matter from the exhaust of a thermal power plant.

**Hint:** Recall the specific mechanism of how the electrostatic precipitator works to reinforce your choice.

### Final Answer
The correct answer is **1) Electrostatic precipitator**.