# Technical Questions asked in Cummins

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1. The stiffness coefficient kij; indicates
1. Force at i due to a unit deformation at j
2. Deformation at j due to a unit force at i
3. Deformation at I due to a unit force at j
4. Force at j due to a unit deformation at i
Stiffness coefficient Kij =Force required to produce unit deformation and Kij means force required in I for unit deformation at j.
1. The number of independent elastic constants for a linear elastic isotropic and homogenous material is
1. 4
2. 3
3. 2
4. 1
2. CnH2n+2 is the general formula of :
1. Paraffins
2. Naphthenes
3. Olefins
4. Aromatics
3. Naphthenic acid is a:
1. Nitrogen compound
2. Hydrocarbon
3. Oxygen compound
4. None of these