____ inductors are created with adjustable core material.
A. Fixed
B. Variable
C. Magnetic
D. Nonmagnetic
Answer: B
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8. Si falla el calentador en una sobrecarga bimetálica de IEC fija,
a. el calentador se debe cambiar por un calentador del mismo tamaño. b. se debe cambiar ese calentador y los demás calentadores del relé de sobrecarga. c. se debe cambiar todo el relé de sobrecarga. d. el calentador se debe cambiar por un calentador del mismo tamaño o ligeramente más pequeño
A 2 kg block of iron is to be dropped from the roof of a tall building. The initial temperature of the iron is 25oC, and the height of the building is 150 m.
(a) Assuming that the block is insulated and ignoring the effects of the atmosphere, determine the final temperature of the iron when it comes to rest on the ground. (b) Develop a computer model for this problem, and plot the final temperature of the iron that would be expected for building heights ranging from 10 m to 500 m. Given: Fe; m = 2 kg; T1 = 25oC; z1 = 150 m; z2 = 0 m Assume: Q = W = ?KE = 0; The iron is an incompressible substance with constant specific heats: c = 0.447 kJ/kg-K = 447 J/kg-K What will be an ideal response?
The United Nations predicts that the world’s human population will stabilize at around how many billions over the
next three centuries?
What will be an ideal response?The white spot at the free edge of the artificial nail tip is:
What will be an ideal response?