These days, impact printing such as that of a standard type writer has been replaced by high quality , high speed ink-jet printing . Its basic lies in building up of alphabets or figures by a jet of tiny liquid drops . Th negatively charged drops are guided by passing them between two conducing plates. A signal from a computer determines the charge on the drop. An electric field guides the drop to a particular position on the paper. About 100 tiny droplets are needed to form a single character.
The advantage of ink-jet printing over standard impact printing is

Options

A. Its high-speed
B. Its low cost
C. Simplicity of design
D. All of these

Answer

To answer the question regarding the advantages of ink-jet printing over standard impact printing, we can break down the reasoning step by step:

### Step 1: Understand the Printing Methods
- **Impact Printing**: This method, such as that used in typewriters, involves physically striking an inked ribbon against paper to create characters. Each character must be typed individually, which can be time-consuming.
- **Ink-Jet Printing**: This modern method uses tiny droplets of ink that are sprayed onto the paper. The droplets are controlled electronically, allowing for rapid and precise printing.

**Hint**: Consider how each method operates and the implications of their mechanisms on speed and efficiency.

### Step 2: Analyze Speed
- Ink-jet printers can print entire pages quickly because they can produce multiple characters simultaneously by spraying many tiny droplets at once. In contrast, typewriters require manual input for each character, making them significantly slower.

**Hint**: Compare the time taken to print a single page using both methods.

### Step 3: Evaluate Cost
- While typewriters were generally low-cost, modern ink-jet printers can be more expensive due to their advanced technology and capabilities. Therefore, cost is not an advantage of ink-jet printing.

**Hint**: Think about the initial investment and maintenance costs associated with each printing method.

### Step 4: Consider Design Complexity
- The design of ink-jet printers is more complex due to the technology involved in controlling the ink droplets and the electronic components. In contrast, typewriters have a simpler mechanical design.

**Hint**: Reflect on the assembly and maintenance of both types of printers.

### Step 5: Conclusion
Based on the analysis:
- The primary advantage of ink-jet printing over standard impact printing is its **high speed**. This allows for efficient printing of documents, making it preferable for modern printing needs.

**Final Answer**: The advantage of ink-jet printing over standard impact printing is its high speed.