DIRECT-CURRENT DYNAMOS AND MOTORS. 7- 
%3. 
74. 
75. 
76. 
77. 
78. 
49. 
80. 
$1. 
82. 
83. 
What are the smallest and greatest values of the velocity v 
in the Edison bipolar drum machines tabulated on page 
18, Instruction Book? State which size machine has the 
minimum value of v,and for which size v is a maximum. 
Give the maximum and minimum values of the shape ratio, 
m for Edison drum armatures. 
From Table 7%, Instruction Book, find the average value of 
the velocity v for Westinghouse medium-speed drum 
armatures. 
Find a similar average for General Electric medium-speed_ 
- ring armatures, from Table 8. 
Give the values of the shape ratios m and m’ for No. 1, 
No. 4, and No. 6 machines of Table 8, Instruction hack 
What are the values of v used in the 2 K. W., 50 K. W., 
and 600 K. W. Crocker-Wheeler multipolar generators 
(Table 9)? 
What are the shape ratios m of the armatures of the ma- 
chines named in the preceding question ? 
Compute the peripheral velocities of the General Electric 
low-speed generators given in Table 1. 
Find the values of the shape ratios m referred to in the pre- 
ceding question. 
From dimensions A, C, and D, given in Table 10, deter- 
mine the ratios m’, of radial thickness of the solid portion 
of the armature core to the diameter, for General Elec- 
tric low-speed multipolar generators. 
Compare the two 17.5 K. W-. high-speed ring machines 
given in Table 11. 
