1.

Which of the mentioned below is the Grashoff’s formula?(a) th=D\(\sqrt{\frac{3}{16}\frac{P_{max}}{T}}\)(b) th=D\(\sqrt{\frac{3}{16}\frac{P_{max}}{\sigma_b}}\)(c) th=D\(\sqrt{\frac{3}{16}\frac{P_{max}}{BP}}\)(d) th=D\(\sqrt{\frac{3}{16}\frac{P_{max}}{IP}}\)This question was addressed to me by my college director while I was bunking the class.This question is from IC Engine topic in chapter Design of IC Engine Components of Automotive Engine Design

Answer»

Right choice is (B) th=D\(\sqrt{\frac{3}{16}\frac{P_{max}}{\sigma_b}}\)

EXPLANATION: According to Grashoff’s law formula, the thickness of the piston HEAD is given by, th=D\(\sqrt{\frac{3}{16}\frac{P_{max}}{\sigma_b}}\)

Where D is the BORE diameter, Pmaxis maximum gas pressure and σb is the stress on the CYLINDER head.


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