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CURRENT RECTIFICATION 273
Installation Suggestions, page 312
119. What first inspection should be made in a newly acquired generator? /jfri.<
120. Do all motors require a starting box? i o-^ ^!
121. What should be the capacity of the wires
122. Does the Underwriter's rated capacity insure economic operation? ,+^c ■ ./;»
123. How do you arrive at the best wire sizes?
124. In selecting wire sizes is it necessary to provide for future increases in current consumption ? /^o .
125. How is the voltage drop of a circuit calculated? >
126. When is it wise to know the performance curve of a generator? • •
Installation, page 313
127. Where should a motor-generator set be located?
128. What are the objections to placing the generator too far from the projection room? •-/.■ (
129. Can a generator be mounted on springs to absorb vibration?
130. Should there be plenty of clear space around the generator?
Brushes, page 315
131. What is important with regard to commutator brushes?
132. What is the correct method of fitting brush ends to the commutator surface?
133. What is best evidence that a commutator is in good condition ?
134. How is the correct setting of the rocker arm (brush yoke) indicated ?
135. What is the correct pressure in pounds for each square inch of brush surface?
136. If scale measurements show that brush pull varies, what condition is indicated and how can it be corrected?
137. How would you calculate brush pressure on contact surface?
138. How may brush pressure be measured by means of a rubber band?
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