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Total Questions : 5013 | Page 6 of 502 pages
Question 51. An "orange peel" effect is observed
  1.    As a defect during metal casting/ welding
  2.    During deep drawing of metallic sheet having large grain size
  3.    During faulty heat treatment of steel
  4.    During extrusion of metal through a die
 Discuss Question
Answer: Option B. -> During deep drawing of metallic sheet having large grain size
Question 52. Pick out the wrong statement.
  1.    Seam welding, projection welding & spot welding are the classification of electrical resistance welding
  2.    Electrode tip in spot welding is of copper and the tip diameter should be equal to t (where, t = plate thickness to be welded)
  3.    In spot welding, two pieces to be joined are overlapped and placed between two electrodes
  4.    Mild steel sheet can not be spot welded
 Discuss Question
Answer: Option D. -> Mild steel sheet can not be spot welded
Question 53. The tensile strength of plastics ranges from __________ kg/mm².
  1.    10 to 50
  2.    50 to 100
  3.    0.01 to 0.1
  4.    0.1 to 10
 Discuss Question
Answer: Option D. -> 0.1 to 10
Question 54. Cobalt - 60 is used as a source of __________ in medical therapy & industrial radiography.
  1.    X-rays
  2.    Γ-rays
  3.    Α-rays
  4.    Β-rays
 Discuss Question
Answer: Option B. -> Γ-rays
Question 55. Device used as a standard for the calibration of pressure gauges is a
  1.    Bellow
  2.    Diaphragm
  3.    Dead weight pressure tester
  4.    Mercury manometer
 Discuss Question
Answer: Option C. -> Dead weight pressure tester
Question 56. Regeneration of molecular seive requires it to be heated to a temperature of about __________ °C.
  1.    80-120
  2.    200-300
  3.    600-800
  4.    1000-1100
 Discuss Question
Answer: Option B. -> 200-300
Question 57. Hot extrusion of aluminium is done in the temperature range of __________ °C.
  1.    550-600
  2.    450-500
  3.    350-400
  4.    250-300
 Discuss Question
Answer: Option C. -> 350-400
Question 58. A gas which is collected over water becomes moistened due to water vapor, exerts its own partial pressure at the gas temperature, which is termed as its
  1.    Aqueous tension
  2.    Saturated humidity
  3.    Vapor pressure
  4.    Absolute humidity
 Discuss Question
Answer: Option A. -> Aqueous tension
Question 59. Which of the following rays has the least wavelength?
  1.    Ultraviolet rays
  2.    Infrared rays
  3.    Cosmic rays
  4.    X-rays
 Discuss Question
Answer: Option C. -> Cosmic rays
Question 60. A fire tube boiler is limited to a maximum steam pressure of about __________ kg/cm².
  1.    6
  2.    18
  3.    38
  4.    52
 Discuss Question
Answer: Option B. -> 18

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