Lakshya Education MCQs

Question: Which of the following is an acidic constituent of B.F. slag ?
Answer: Option A

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Question 1. Dielectric
  1.    Is an electrical insulating material
  2.    Of low resistivity is preferred
  3.    Should have high thermal conductivity
  4.    Need not defy the corrosive action of chemicals
Answer: Option A
Question 2. Largest application of laser welding is in __________ welding.
  1.    Microspot
  2.    Under water
  3.    Precious metals
  4.    Heavy structure
Answer: Option A
Question 3. A dense structure of grinding wheel is not used for the
  1.    Ductile material
  2.    Hard materials
  3.    Brittle materials
  4.    Finishing cuts
Answer: Option A
Question 4. Reynolds number of a fluid flowing in a circular pipe is 10000. What will be the Reynolds number when the fluid velocity is decreased by 30% & the pipe diameter is increased by 30% ?
  1.    9100
  2.    13000
  3.    7000
  4.    2550
Answer: Option A
Question 5. Diamagnetic materials
  1.    Are magnetised by eddy currents only
  2.    Are non-magnetic and can not be magnetised
  3.    Are magnetised in direction opposite to the magnetic field
  4.    Can be magnetised in one direction only
Answer: Option C
Question 6. Pick out the wrong statement.
  1.    For a pressure vessel to be classified as 'thin vessel', the ratio of wall thickness to mean radius is less than 0.1
  2.    For calculating forces and efficiency of rivetted joint, either rivet diameter or rivet hole diameter is used in case of pressure vessel and in structural work
  3.    Longitudinal joint is normally made butt joint to maintain the circularity of the vessel
  4.    Maximum diameter of the opening provided in a pressure vessel, which does not require any compensation is 200 mm
Answer: Option B

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