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Design Electrical Machines
Advanced Design Electrical Machines
Quiz 1
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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
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