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MCQs

Total Questions : 5013 | Page 68 of 502 pages
Question 671. Out of the following, which will fracture most readity, when hit with a hard hammer ?
  1.    Brass
  2.    Bronze
  3.    German silver
  4.    Cast iron
 Discuss Question
Answer: Option D. -> Cast iron
Question 672. Dezincification is a form of corrosion, which specifically applies to
  1.    Steel
  2.    Brass
  3.    Stainless steel
  4.    Babbit metal
 Discuss Question
Answer: Option B. -> Brass
Question 673. Oxyacetylene reducing flame is used while carrying out welding on
  1.    Alloy steel
  2.    Grey cast iron
  3.    Mild steel
  4.    High carbon steel
 Discuss Question
Answer: Option C. -> Mild steel
Question 674. If the head is doubled in & centrifugal pump, the power required will increase in the ratio of
  1.    23
  2.    23/2
  3.    25/2
  4.    21/3
 Discuss Question
Answer: Option B. -> 23/2
Question 675. Oxyacetylene reducing flame is used while carrying out welding on
  1.    Alloy steel
  2.    Grey cast iron
  3.    Mild steel
  4.    High carbon steel
 Discuss Question
Answer: Option C. -> Mild steel
Question 676. Two wires of the same radius & material having length in the ratio of 1 : 2 are stretched by the same force. The strain produced in the two wires will be in the ratio of
  1.    1:1
  2.    1:2
  3.    2:1
  4.    1:4
 Discuss Question
Answer: Option A. -> 1:1
Question 677. __________ of air does not increase with increase in temperature.
  1.    Density
  2.    Thermal diffusivity
  3.    Viscosity
  4.    Thermal conductivity
 Discuss Question
Answer: Option A. -> Density
Question 678. Nusselt number is related to the Reynolds number (Re) in turbulent & laminar flow respectively as
  1.    Re0.5, Re0.8
  2.    Re0.8, Re-0.5
  3.    Re0.8, Re0.5
  4.    Re-0.8, Re0.5
 Discuss Question
Answer: Option C. -> Re0.8, Re0.5
Question 679. Oxygen cylinders used for autogenous (cutting/welding) purposes are
  1.    Seamless & made of steel
  2.    Heat treated before use
  3.    Made by sand casting
  4.    Welded steel cylinders
 Discuss Question
Answer: Option A. -> Seamless & made of steel
Question 680. To improve the machinability of steel, it is generally subjected to
  1.    Spherodising
  2.    Tempering
  3.    Normalising
  4.    Annealing
 Discuss Question
Answer: Option A. -> Spherodising

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