Design of Stator MCQ

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• What is the formula for the flux density in stator core?
  ক

  flux density in stator core = maximum flux / length of the iron * depth of stator core

  খ

  flux density in stator core = maximum flux * length of the iron * depth of stator core

  গ

  flux density in stator core = maximum flux / 2 *length of the iron * depth of stator core

  ঘ

  flux density in stator core = maximum flux * length of the iron / depth of stator core
• The flux density of the stator core should not exceed 1.3 weber per m2.
  ক

  true

  খ

  false
• The flux density of the high torque machines is 1.8 weber per m2.
  ক

  true

  খ

  false
• What is the formula for the area required for the insulated conductors?
  ক

  area required for the insulated conductors = total number of conductors per slot * 0.785 / diameter of insulated conductor2

  খ

  area required for the insulated conductors = total number of conductors per slot / 0.785 * diameter of insulated conductor2

  গ

  area required for the insulated conductors = total number of conductors per slot * 0.785 * diameter of insulated conductor2

  ঘ

  area required for the insulated conductors = 1/total number of conductors per slot * 0.785 * diameter of insulated conductor2
• What is the relation of the number of slots with the leakage reactance?
  ক

  small number of slots, high leakage reactance

  খ

  large number of slots, high leakage reactance

  গ

  large number of slots, small leakage reactance

  ঘ

  small number of slots, small leakage reactance
• What is the range of the current density for the open type motors split phase, capacitor and repulsion start motors?
  ক

  4-5 A per mm2

  খ

  3-4 A per mm2

  গ

  2-4 A per mm2

  ঘ

  1-4 A per mm2
• How many design data are present in the design of the stator?
  ক

  6

  খ

  7

  গ

  8

  ঘ

  9
• What is the value of the stator induced voltage with respect to the supply voltage?
  ক

  stator induced voltage = 95% of supply voltage

  খ

  stator induced voltage = 90% of supply voltage

  গ

  stator induced voltage = 85% of supply voltage

  ঘ

  stator induced voltage = 80% of supply voltage
• What is the formula of the maximum flux in the running winding?
  ক

  maximum flux = flux * pole

  খ

  maximum flux = flux/pole

  গ

  maximum flux = flux / turns

  ঘ

  maximum flux = flux * turns
• What is the range of the winding factor for the usual windings distribution?
  ক

  0.70-0.80

  খ

  0.75-0.85

  গ

  0.70-0.85

  ঘ

  0.70-0.75
• What is the formula for the mean pitch factor?
  ক

  mean pitch factor = pitch factor of each coil per pole group + turns in the coil / total number of turns

  খ

  mean pitch factor = pitch factor of each coil per pole group / turns in the coil * total number of turns

  গ

  mean pitch factor = pitch factor of each coil per pole group * turns in the coil * total number of turns

  ঘ

  mean pitch factor = pitch factor of each coil per pole group * turns in the coil / total number of turns
• How can the small single phase motor reduce the harmonics still much further?
  ক

  removing the winding

  খ

  insulating the winding

  গ

  grading the winding

  ঘ

  shading the winding
• How much of the total slots are used for the reduction of the mmf wave harmonics?
  ক

  60%

  খ

  65%

  গ

  70%

  ঘ

  80%
• How many coils are present in the stator windings?
  ক

  2

  খ

  3

  গ

  2 or more

  ঘ

  3 or more
• What type is the stator windings of the single phase induction motor?
  ক

  hollow

  খ

  cylindrical

  গ

  concentric

  ঘ

  rectangular