Question

The percentage regulation in a governor with speed at no load 1100 rpm and speed at load 900 rpm is:

• A. 12%
• B. 20%
• C. 120%
• D. 400%

Hint:

Governor regulation is usually calculated using the mean speed.
Regulation = \(\frac{N_1 - N_2}{N} \times 100\), where N is the mean speed.

Answer 1

The Correct Option is B

Step 1: Understanding the Concept:
Governor regulation is the change in speed from no load to full load.
We need to calculate the percentage regulation.

Step 2: Key Formula or Approach:
Percentage regulation = \(\frac{\text{No load speed} - \text{Full load speed}}{\text{Mean speed}} \times 100\).

Step 3: Detailed Explanation:
No load speed = 1100 rpm.
Full load speed = 900 rpm.
Mean speed = (1100 + 900) 2 = 1000 rpm.
Regulation = \(\frac{1100 - 900}{1000} \times 100 = \frac{200}{1000} \times 100 = 20\%\).

Step 4: Final Answer:
The percentage regulation is 20%.
Hence, the correct option is (B).