We use Optical Character Recognition (OCR) during our scanning and processing workflow to make the content of each page searchable. You can view the automatically generated text below as well as copy and paste individual pieces of text to quote in your own work.
Text recognition is never 100% accurate. Many parts of the scanned page may not be reflected in the OCR text output, including: images, page layout, certain fonts or handwriting.
MANAGERS AND PROJECTIONISTS 921
325_What is a "mil" ? A "circular mil" ? 24-34-70
326 — Into how many degrees is every circle divided ? 24
327 — Upon what does the width, measurement in inches, across
a degree depend? 24
328 — If a circle be 36 inches in circumference, how wide
would one degree of it be in inches ? 24
329 — Describe a B. & S. wire gauge 78
330 — What other tool may be used to measure round wires?. .78-79 331 — In a common fraction what does the horizontal line
indicate ? 54
332 — Horsepower, what is it ? 30
333 — Horsepower, electrical, what is it ? 30
334 — In calculating resistance of projector arc circuit in what
way do we make allowance for resistance of arc itself? 58 335 — Explain how you would calculate resistance in ohms if
amperes and voltage were known ? 55
336— What is "Ohm's Law"? -. 55
337 — How would you calculate number of amperes a known
voltage will force through a known resistance ? 55
338 — For purposes of calculation what is meant by "arc
voltage constant" ? 56
339 — How would you calculate ohmic resistance of projector
arc? 57
340 — How would you calculate area of cross section of round
wires ? 77
341 — How would you calculate capacity of any round copper
wire ? 77
342 — How would you calculate voltage drop of circuit carrying a known amperage ? 75
343 — How would you calculate size of wires to carry given
amperage at given voltage drop ? 76
344 — How would you determine whether or not any circuit is
operating economically? 76
345 — What is the area of cross section of a wire l/§, inch in
diameter? Of a wire 100 mills in diameter? Of a wire
Y$ inch in diameter ? 77
346 — How would you calculate voltage it would take to force
given number of amperes through a known resistance ? . . 55 347 — What is the area of cross section of a wire 1/1000 inch
in diameter ? 77
348 — What does "squaring the diameter" mean? 77
349 — How many horsepower in 10,000 watts ? 77
350— Kilowatt hour, what is it? 31
351 — As applied to motors, generators, etc., what is meant by
the term "efficiency," and how is it measured ? 27
Electric Generators, or Dynamos
352 — Upon what law is action of generator (dynamo) based? 7
353 — Explain action of elementary generator, Fig. 1 7
354 — What is an armature?. . 21