____ occurs when the load on the engine is greater than the rpm needed to develop enough horsepower to pull the load.

A. Knurling
B. Lugging
C. Knocking
D. Stitching


Answer: B

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Al seleccionar relés de sobrecarga de motor, es necesario considerar todo lo siguiente EXCEPTO el/la:

a. corriente a plena carga del motor. b. tipo de motor. c. diferencia de temperatura entre el motor y el controlador. d. edad del motor

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____ is very well suited for making welds on steel, steel alloys (including stainless), nickel alloys, and most other metals other than aluminum or magnesium.

A. Zirconium tungsten B. Pure tungsten C. Thoriated tungsten D. Lanthanum tungsten

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PROBLEM 3.148 A hollow cylindrical shaft was designed to have a uniform wall thickness of 0.1 in. Defective fabrication, however, resulted in the shaft having the cross section shown. Knowing that a 15-kip ? in. torque is applied to the shaft, determine the shearing stresses at points a and b.

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A clamp on ammeter could be used to determine which line of the three lines that supply voltage to a motor has a blown fuse if the motor is humming and trying to start

Indicate whether the statement is true or false

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