The difference between an N-channel and a P-channel JFET is _____.
a. that the P-channel JFET contains a drain terminal
b. that the N-channel JFET contains a drain terminal
c. the allowable ampacity
d. the polarity of the voltage
d. the polarity of the voltage
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Pressure plate assemblies may include all of the following except ________.
A) Coil springs and weighted release levers
B) Diaphragm spring and pivot rings
C) Release fork, return springs, and pivot
D) Coil springs, release levers, and rollers
A shelf angle in a brick veneer wall assembly is required to be discontinuous with a 3/8 in. gap between individual lengths, not exceeding 20 ft. Why is that so?
What will be an ideal response?
All of the following statements about DC brushless (DCBL) motors are true EXCEPT:
A. A typical DCBL motor is 85-90 percent efficient, and higher efficiencies have been produced. B. As a DCBL rotor turns, its permanent magnetic fields interact with the stator's electromagnetic fields. C. Magnetic attraction pulls the rotor along in its continuing rotation, causing torque output. D. Maximum torque production of a DCBL motor occurs immediately, from when it starts until about 3,000 rpm.
Refer to the actuator of Figure P18.16. The entire device is made of sheet steel. The coil has 2,000 turns. The armature is stationary so that the length of the air gaps, g = 10 mm, is fixed. A direct current passing through the coil produces a flux density of 1.2 T in the gaps. Assume ?r = 4,000 for sheet steel. Determine:
a. The coil current.
b. The energy stored in the air gaps.
c. The energy stored in the steel.
