A transformer is to be designed to increase the 30 kV rms output of a generator to the transmission-line voltage of 345 kV rms. If the primary winding has 80 turns, how many turns must the secondary have?
A. 6
B. 70
C. 920
D. 9200
E. 12
Answer: C
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A nuclear chain reaction is possible because, for the isotopes that can participate in a chain reaction, each nucleus when fissioned
A. produces more neutrons than are required to fission one nucleus. B. produces more energy than is required to fission one nucleus. C. produces daughters that can also be fissioned to produce more energy. D. produces daughters that can fuse together to make more of the same isotope.
When a tensile stress is applied to a composite material with short fibers, the tensile stress in the matrix is transferred into the fibers by _________stress between the matrix and the fiber.
Fill in the blank(s) with the appropriate word(s).
In light of modern solar system theory, why do the orbits of the planets all lie in the same plane?
A) The Sun's gravity forced them into these orbits. B) The angular momentum of the solar system was kept to a minimum this way. C) The early solar nebula flattened into a disk. D) Comets would have wiped out any not in this protected plane. E) This happened purely by chance.
Acceleration: If the velocity of an object is zero at some point, then its acceleration must also be zero at that point.
A. True B. False