Chemical Engineering Basics(Chemical Engineering ) Questions and Answers

Question 1. Stresses encountered in the metal forming processes are less than the __________ of the material.
  1.    Fracture strength
  2.    Yield strength
  3.    Elastic limit
  4.    Limit of proportionality
Explanation:-
Answer: Option A. -> Fracture strength
Question 2. Reduction in the grain size reduces the __________ of the material.
  1.    Fatigue resistance
  2.    Tensile strength
  3.    Creep resistance
  4.    All of the above
Explanation:-
Answer: Option D. -> All of the above
Question 3. __________ addition increases the depth of hardness of steel.
  1.    Chromium
  2.    Nickel
  3.    Tungsten
  4.    Vanadium
Explanation:-
Answer: Option A. -> Chromium
Question 4. The maximum value, which the residual stress in a material can reach is the __________ of the material.
  1.    Elastic limit
  2.    Plastic limit
  3.    Yield stress
  4.    Breaking stress
Explanation:-
Answer: Option A. -> Elastic limit
Question 5. Freezing of 35% oleum during its shipment in winter is avoided by the addition of small amount of
  1.    Hydrochloric acid
  2.    Methyl alcohol
  3.    Formic acid
  4.    Nitric acid
Explanation:-
Answer: Option D. -> Nitric acid
Question 6. Which of the following relationships is correct for relating the three elastic constants of an isotropic elastic material (where, E = Young's modulus, G = Modulus of rigidity or shear modulus v = Poisson's ratio)?
  1.    E = 2G (1 + v)
  2.    E = G (1 + v)
  3.    $${\text{E}} = \frac{{{\text{G}}\left( {1 + {\text{v}}} \right)}}{2}$$
  4.    E = 2G (1 + 2v)
Explanation:-
Answer: Option A. -> E = 2G (1 + v)
Question 7. Air-petrol ratio in an automotive petrol engine is around
  1.    14 : 1
  2.    22 : 1
  3.    25 : 1
  4.    4 : 1
Explanation:-
Answer: Option A. -> 14 : 1
Question 8. For a small scale toy factory, the fixed cost per month is Rs. 5000/-. The variable cost per toy is Rs. 20 and sales price is Rs. 30 per toy. The break even production per month will be __________ toys.
  1.    250
  2.    500
  3.    1000
  4.    3000
Explanation:-
Answer: Option B. -> 500
Question 9. Commonly used flux for brazing is
  1.    Zinc chloride
  2.    Borax
  3.    Ammonium chloride
  4.    Rosin
Explanation:-
Answer: Option B. -> Borax
Question 10. Dephosphorisation of molten pig iron is favoured by
  1.    Oxidising and basic slag
  2.    Reducing and basic slag
  3.    High activity co-efficient of phosphorous in metal
  4.    Oxidising and neutral slag
Explanation:-
Answer: Option B. -> Reducing and basic slag
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