In the operation of a steam-electric generating plant, the thermal energy input occurs
A) in the electric generators.
B) in the condenser.
C) at the point where the energy from the furnace is transferred into the boiler.
D) at the point where the fossil or other fuel is shipped into the plant area.
E) at the point where the hot steam pushes against the turbine.
C
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The sidereal period of the Moon is
a. about 27.32 days long. b. the period of time for the Moon to orbit Earth once with respect to the stars. c. the period of time between successive eclipses at a given location on Earth. d. the period of time from when the Moon rises until the Moon rises again the next night. e. about 27.32 days long and the period of time for the Moon to orbit Earth once with respect to the stars.
A weight hangs from a string but is pulled to one side by a horizontal string, as shown. The tension force exerted by the angled string is
A. Less than the hanging object’s weight. B. Equal to the hanging object’s weight. C. Greater than the hanging object’s weight
An object is moving with constant non-zero acceleration in the +x-axis. The velocity versus time graph of this object is
A) a horizontal straight line. B) a vertical straight line. C) a straight line making an angle with the time axis. D) a parabolic curve. E) a hyperbolic curve.
The primary winding of an electric train transformer has 400 turns and the secondary has 50 . If the input voltage is 120 V (rms) what is the output voltage?
a. 15 V (rms) b. 30 V (rms) c. 60 V (rms) d. 2.4 V (rms) e. 960 V (rms)