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MCQs

Total Questions : 107 | Page 6 of 11 pages
Question 51. . The material used for resistance temperature sensor is :
  1.    Copper
  2.    Nickel
  3.    Platinum
  4.    Any one of above
 Discuss Question
Answer: Option D. -> Any one of above
Question 52. . In calibration of temperature sensors by fixed point method, the device is calibrated at :
  1.    Ice point (0?C)
  2.    Steam point (100?C)
  3.    Sulphur point (444.6?C)
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 53. . To prevent self-heating errors becoming too great, the current through platinum element (100 ohm) is kept at a very small value :
  1.    0.1 mA
  2.    1 mA
  3.    5 mA
  4.    20 mA
 Discuss Question
Answer: Option C. -> 5 mA
Question 54. . Flange taps in case of orifice plate are installed:
  1.    25 mm from each side of the orfice plate
  2.    D (pipe diameter) upstream and D/2 downstream
  3.    Just at surface of orifice plate
  4.    2.5 D upstream and 8 D downstream
 Discuss Question
Answer: Option A. -> 25 mm from each side of the orfice plate
Question 55. . Local velocity is measured by a:
  1.    Pitot tube
  2.    Venturi tube
  3.    Orifice plate
  4.    (a) vena contracta device
 Discuss Question
Answer: Option A. -> Pitot tube
Question 56. . Pick up correct statement about calibration of temperature sensors by comparison method using liquid bath :
  1.    Water is used for temperatures from 0 to 100?C
  2.    Special grade of paraffin oil is used for temperatures between 100 and 200?C
  3.    For temperature between 200 and 600?C, a mixture of sodium nitrate and potassium nitrate is used
  4.    All of above are true
 Discuss Question
Answer: Option D. -> All of above are true
Question 57. . Vena-contracta taps are employed :
  1.    D upstream and D downstream from the plate
  2.    D upstream and at vena contracta
  3.    2 D upstream and at vena contracta
  4.    Just at surface of plate upstream and at vena contracta
 Discuss Question
Answer: Option B. -> D upstream and at vena contracta
Question 58. . 15? taper venturi tube causes loss of following % of the differential pressure :
  1.    0.05
  2.    0.1
  3.    0.2
  4.    0.3
 Discuss Question
Answer: Option B. -> 0.1
Question 59. . For an orfice plate having ratio of inside and pipe diameter as 0.5, the pressure loss in comparison to differential pressure created is of the order of :
  1.    -0.05
  2.    50%.
  3.    0.2
  4.    0.35
 Discuss Question
Answer: Option B. -> 50%.
Question 60. . Dall tube is another variation of
  1.    Orifice plate
  2.    Nozzle
  3.    Venturi tube
  4.    Rotameter
 Discuss Question
Answer: Option C. -> Venturi tube

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