The rotor of an ECM motor is composed of:
A) Layers of laminated soft iron.
B) Permanent magnets.
C) A solid bronze casting.
D) Copper windings coiled around layers of laminated soft iron.
B
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PROBLEM 2.41 A brass bolt (Eb = 15 ? 106 psi) of -in. diameter is fitted inside a steel tube (Es = 29 ? 106 psi) of -in. outer diameter and -in. wall thickness. After the nut has been fit snugly, it is tightened one-quarter of a full turn. Knowing that the bolt is single-threaded with a 0.1-in. pitch, determine the normal stress (a) in the bolt, (b) in the tube.
You are taking a skiing trip to Telluride, Colorado, on route 145 and pass through Lizard Head Pass at an elevation of about 11,222 feet. Your engine is rated at 180 horsepower at sea level. What would be the horsepower loss while going over Lizard Head Pass?
Fill in the blank(s) with the appropriate word(s).
One difference between MOSFETs and JFETs is
A) Some MOSFETs have no channel until they are biased B) MOSFETs use only positive gate-source voltages C) JFETs produce non-linear transconductance curves D) All of the above