Q.1
What is the range of current density in the damper bars?
  • a) 3-4 A per mm2
  • b) 3-5 A per mm2
  • c) 3-6 A per mm2
  • d) 4-6 A per mm2
Q.2
What is the percentage of the damper windings slot pitch with respect to stator slot pitch?
  • a) 30%
  • b) 40%
  • c) 20%
  • d) 60%
Q.3
What is the formula for the pole arc?
  • a) pole arc = number of bars per pole * stator slot pitch * 0.8
  • b) pole arc = number of bars per pole / stator slot pitch * 0.8
  • c) pole arc = number of bars per pole * stator slot pitch / 0.8
  • d) pole arc = 1 / number of bars per pole * stator slot pitch * 0.8
Q.4
What is the formula for the length of each damper bar for small machines?
  • a) length of each damper bar = 1.1 * axial length
  • b) length of each damper bar = axial length + 0.1
  • c) length of each damper bar = axial length – 0.1
  • d) length of each damper bar = 1.1 / axial length
Q.5
What is the formula for the area of cross-section of each damper bar?
  • a) area of cross section of each damper bar = total area of bars per pole – number of damper bars per pole
  • b) area of cross section of each damper bar = total area of bars per pole + number of damper bars per pole
  • c) area of cross section of each damper bar = total area of bars per pole / number of damper bars per pole
  • d) area of cross section of each damper bar = total area of bars per pole * number of damper bars per pole
Q.6
What is the formula of the area of each ring short-circuiting the bars?
  • a) area of each ring short-circuiting the bars = (0.7-0.9) * area of damper bar
  • b) area of each ring short-circuiting the bars = (0.8-1) * area of damper bar
  • c) area of each ring short-circuiting the bars = (0.7-1) * area of damper bar
  • d) area of each ring short-circuiting the bars = (0.8-0.9) * area of damper bar
Q.7
Given : total area =mm2 and Number of bars = 8 for a rotor design, what is the value of area of each damper bar?
  • a) 59 mm2
  • b) 455 mm2
  • c) 475 mm2
  • d) 3784 mm2
Q.8
What is the formula for the height of pole shoe sufficient to accommodate the damper windings?
  • a) height of pole shoe = diameter of damper bars
  • b) height of pole shoe = 2 * diameter of damper bars
  • c) height of pole shoe = diameter of damper bars/2
  • d) height of pole shoe = 3 * diameter of damper bars/2
Q.9
Pole profile drawing helps in obtaining the various dimensions of the pole.
  • a) true
  • b) false
Q.10
The pole shoe drawing is completed by fixing the height of pole shoe.
  • a) true
  • b) false
0 h : 0 m : 1 s