The major advantage of MHD generators over conventional generators is that MHD generators
A) do not use electromagnetic induction.
B) do not require magnets.
C) require no power input.
D) all of the above
E) none of the above
Answer: E
You might also like to view...
In a lead-shot tower, spherical 0.95-cm-diameter BB shots are formed by drops of molten lead which solidify as they descend in cooler air. At the terminal velocity, i.e., when the drag equals the gravitational force, estimate the total heat transfer coefficient if the lead surface is at 171°C, the surface of the lead has an emissivity of 0.63, and the air temperature is 16°C. Assume CD = 0.75 for the first trial calculation.
GIVEN
• Spherical lead-shot falling through the air at terminal velocity
• Shot diameter (D) = 0.95 cm = 0.0095 m
• Lead surface temperature (Ts) = 171°C = 494 K
• Lead surface emissivity (?) = 0.63
• Air temperature (T?) = 16°C 289 K
• Assume CD = 0.75 for the first trial calculation FIND
• The total average heat transfer coefficient (htotal). ASSUMPTIONS
• The surroundings act as a black body enclosure at T?
SKETCH
What is created by the fusion of three helium nuclei?
B) oxygen C) carbon D) nitrogen E) iron
The lakes on Titan have not been observed to have any waves. What does this suggest?
What will be an ideal response?
A piece of taffy slams into and sticks to another identical piece of taffy at rest. The momentum of the two pieces of taffy stuck together after the collision is the same as it was before the collision
Kinetic energy is a different story, for part of it turns into heat. What percentage of the kinetic energy converts into heat? A) 0% B) 25% C) 50% D) 75% E) not enough information