The height of hammer fall in a standard penetration test is
- A65 cm
- B65.3 cm
- C63.5 cm
- D75 cmCorrect
Solution
Concept
The Standard Penetration Test (SPT) uses a 63.5 kg hammer falling freely through a height of 75 cm to drive a split-spoon sampler.
Formula
Energy = m × g × h (where m = 63.5 kg, h = 75 cm)
Step-by-step solution
1. Recall the standard specifications of the Standard Penetration Test (SPT) according to IS 2131. 2. The mass of the drop hammer is 63.5 kg. 3. The height of free fall for the hammer is 75 cm. 4. Therefore, the correct option is (D).
Shortcut
Remember the numbers: 63.5 kg mass and 75 cm fall.
Correct answer: D) 75 cm