The basic squirrel-cage induction motor is a(n) ____________________ speed motor.
Fill in the blank(s) with the appropriate word(s).
constant
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Double-face clutches have both the armature and field discs mounted on the same hub.
Answer the following statement true (T) or false (F)
Identify and explain the system for identifying levels of crash severity as used in the Highway Safety Manual.
What will be an ideal response?
Rooftop units should not be installed in close proximity to exhaust vents or industrial processes that create fumes because:
A) The roof supports are weaker near the vents. B) The exhaust can be pulled into the unit's outdoor air intake. C) The heat from the rooftop unit might cause down drafts. D) The exhaust might stain the side of the unit.
For the electromagnet of Example 18.9:
a. Calculate the current required to keep the bar in place. (Hint: The air gap becomes zero, and the iron reluctance cannot be neglected.) Assume ?r = 1,000, L = 1 m.
b. If the bar is initially 0.1 m away from the electromagnet, what initial current would be required to lift the magnet?
Example 18.9
An electromagnet is used to collect and support a solid piece of steel, as shown in Figure 18.38. Calculate the starting current required to lift the load and the holding current required to keep the load in place once it has been lifted and is attached to the magnet. Assume that the cross-sectional areas of the electromagnet, load (bar), and air gap are equal.
Assumptions:
a) Air gap becomes zero and the iron reluctance cannot be neglected
b) Neglect the iron reluctance
