Question

In a hot water heating system, there is a cylindrical pipe of length 35m and diameter 6 cm. Then, the total radiating surface in the system is (in cm²) – 

1. 56,000 cm2
2. 64,000 cm2
3. 66,000 cm2
4. 88,000 cm2

Answer 1

Correct Answer - Option 3 : 66,000 cm2

Given:

Length = 35 m = 3500 cm and radius = 6/2 = 3 cm

Formula used:

Curved surface area of cylinder = 2πrh

Calculation:

Curved surface area of cylindrical pipe = 2πrh

⇒ 2 ×22/7 × 3 × 3500

⇒ 66,000 cm²