Interview Question for experienced Civil Engineer

Diameter of known bar D1 =20 mm

Spacing of known bar S1 =150 mm

Then we have to find

Diameter of Second Bar ( D2) = 16mm , Spacing of Second Bar (S2) = ?

D1^2 / S1 = D2^2 /S2 

S2 = (D2^2 x S1)/ (D1^2)

Put the values you get the answer :- 96 mm