Discuss the use of shielded cable in signal wiring and the noise reduction it provides.
What will be an ideal response?
Shielded cable is used for the installation of signal wiring. One of the most common types uses twisted wires with a Mylar foil shield. The ground wire must be grounded if the shielding is to operate properly. This type of shielded cable can provide a noise reduction ratio of about 30,000: 1. Another type of signal cable uses a twisted pair of signal wires surrounded by a braided shield. This type of cable provides a noise reduction of about 300: 1.
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When leveling brick, the following procedure should be followed:
A. High brick should be removed and relaid in fresh mortar. B. Use a hammer rather than a trowel to tap down any brick that is high in relation to level. C. Brick that is low in relation to the level must be picked up and relaid in fresh mortar. D. Use a trowel to lift brick that is low in relation to level and add mortar to raise the brick to level.
John Brown's execution produced all of the following results EXCEPT
A. Harriet Tubman praised Brown's support of freedom for slaves. B. abolitionists and Free Soilers were outraged. C. Ralph Waldo Emerson and other northerners hailed him as a martyr, much like Jesus. D. Southerners wondered how they could stay in the Union. E. Brown's bloody past prior to the Harper's Ferry raid was exposed and he was discredited.
Blacks in the South relied on the Union League to
A. help them escape to the North during the Civil War. B. provide them with relief payments until the Freedmen's Bureau was established. C. educate them on their civic duties and campaign for Republican candidates. D. gain admittance to the Union Army. E. None of these choices are correct.
A contactor's LRA rating may be:
A) 2 to 3 times as high as its FLA rating. B) 8 to 10 times as high as its FLA rating. C) 3 to 4 times as high as its FLA rating. D) 4 to 5 times as high as its FLA rating.