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MCQs

Total Questions : 112 | Page 9 of 12 pages
Question 81. A ring having a cross-sectional area of 500 mm², a circumference of 400 mm and ϕ=800microWb has a coil of 200 turns wound around it. Relative permeability of ring is 380. Calculate the reluctance.
  1.    1.68 * 10¯⁴A/Wb
  2.    1.68 * 10⁴ A/Wb
  3.    1.68 * 10⁶ A/Wb
  4.    1.68 * 10¯⁶A/Wb
 Discuss Question
Answer: Option C. -> 1.68 * 10⁶ A/Wb
Answer: (c).1.68 * 10⁶ A/Wb
Question 82. A ring having a cross-sectional area of 500 mm², a circumference of 400 mm and ϕ=800microWb has a coil of 200 turns wound around it. Calculate the flux density of the ring.
  1.    1.6T
  2.    2.6T
  3.    3.6T
  4.    4.6T
 Discuss Question
Answer: Option A. -> 1.6T
Answer: (a).1.6T
Question 83. A ring having a cross-sectional area of 500 mm², a circumference of 400 mm and ϕ=800microWb has a coil of 200 turns wound around it. Relative permeability of ring is 380. Calculate the magnetising current.
  1.    6.7A
  2.    7.7A
  3.    7.6
  4.    6.1A
 Discuss Question
Answer: Option A. -> 6.7A
Answer: (a).6.7A
Question 84. A ring having a cross-sectional area of 500 mm², a circumference of 400 mm and ϕ=800microWb has a coil of 200 turns wound around it. Relative permeability of ring is 380. Calculate the magnetomotive force.
  1.    1442At
  2.    1342At
  3.    1432At
  4.    1344At
 Discuss Question
Answer: Option D. -> 1344At
Answer: (d).1344At
Question 85. Can we apply Kirchhoff’s law to magnetic circuits?
  1.    Yes
  2.    No
  3.    Depends on the circuit
  4.    Insufficient information provided
 Discuss Question
Answer: Option A. -> Yes
Answer: (a).Yes
Question 86. While comparing magnetic and electric circuits, the flux of magnetic circuit is compared with which parameter of electrical circuit?
  1.    Current density
  2.    E.M.F
  3.    Current
  4.    Conductivity
 Discuss Question
Answer: Option C. -> Current
Question 87. Those materials are well suited for making permanent magnets which have ________ retentivity and ________ coercivity.
  1.    Low, low
  2.    Low, high
  3.    High, low
  4.    High, high
 Discuss Question
Answer: Option D. -> High, high
Question 88. Point out the wrong statement. Magnetic leakage is undesirable in electric machines because it
  1.    Lowers their power efficiency
  2.    Produces fringing
  3.    Increases their cost of manufacture
  4.    Leads to their increased weight
 Discuss Question
Answer: Option A. -> Lowers their power efficiency
Question 89. The unit of magnetic flux is
  1.    Weber
  2.    Henry
  3.    Ampere-turn/weber
  4.    Ampere/metre
 Discuss Question
Answer: Option A. -> Weber
Question 90. Laminated cores, in electrical machines, are used to reduce
  1.    Eddy current loss
  2.    Copper loss
  3.    All of the listed here
  4.    Hysteresis loss
 Discuss Question
Answer: Option A. -> Eddy current loss

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