Technical Questions asked in Cummins

  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
    Answer:  Option A.
    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
    Answer: Option  C.
  2. CnH2n+2 is the general formula of :
    1. Paraffins
    2. Naphthenes
    3. Olefins
    4. Aromatics
    Answer: Option  A.
  3. Naphthenic acid is a:
    1. Nitrogen compound
    2. Hydrocarbon
    3. Oxygen compound
    4. None of these
    Answer: Option  C.
  4. Neutral flame is used for welding
    1. Brasses only
    2. Bronzes only
    3. Brasses and bronzes
    4. None of these
    Answer: Option  C.
  5. Which of the following has highest thermal diffusivity?
    1. Iron
    2. Lead
    3. Wood
    4. None of these
    Answer: Option B

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