INDUSTRIAL MOTOR CONTROL
7th Edition
ISBN: 9780357670590
Author: Herman
Publisher: CENGAGE L
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Chapter 61, Problem 1RQ
To determine
The words for which UJT stand for.
Expert Solution & Answer
Explanation of Solution
The UJT stands for unijunction transistor, it is the three terminal device that has only one junction and works as an electrically controlled switch.
The two terminals of the UJT act as the base of the device and one of the terminal as the emitter. As the unijunction transistor has two states that are on and off it is a digital device.
Thus, the letters UJT stands for unijunction transistor
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motor supplies 200 kW at 6 Hz to flange A of the shaft shown in Figure. Gear B transfers 125 W of power to operating machinery in the factory, and the remaining power in the shaft is mansferred by gear D. Shafts (1) and (2) are solid aluminum (G = 28 GPa) shafts that have the same diameter and an allowable shear stress of t= 40 MPa. Shaft (3) is a solid steel (G = 80 GPa) shaft with an allowable shear stress of t = 55 MPa. Determine:
a) the minimum permissible diameter for aluminum shafts (1) and (2)
b) the minimum permissible diameter for steel shaft (3).
c) the rotation angle of gear D with respect to flange A if the shafts have the minimum permissible diameters as determined in (a) and (b).
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