The couplings joining lighting trolley sections make a ____ connection, electrically and mechanically, between two duct sections and permit free passage of the trolleys along the duct runs.

A. positive
B. negative
C. neutral
D. perfect


Answer: A

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Si un cable se clasifica como 6 x 19 Seale IWRC, el 6 representa _____.

a. la cantidad de alambres en cada torón b. la cantidad de torones en un cable c. el diámetro del cable d. el grado de acero utilizado

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The prints that show how the component parts of a product fit together are called:

a. detail prints b. assembly prints c. working prints d. manufacturing prints

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GTAW power supplies may be of this type:

A) Magnetic amplifier B) Solid state C) Inverter D) All of the above

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For larger diameter GMAW and SMAW electrodes the included angle may be as much as:

A) 70 degrees B) 5 degrees C) 15 degrees D) 60 degrees

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