Prove that
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A live-dead-live test is conducted in order to _____.
a. disconnect switches and fuses b. verify the test instrument operation c. make sure the capacitors are discharged d. verify that a circuit is de-energized
President Ulysses S. Grant was reelected in 1872 because
A. the Democrats and Liberal Republicans could not decide on a single candidate. B. he promised reforms in the political system. C. he was the only candidate who enjoyed support in both the North and South. D. the Democrats and Liberal Republicans chose the politically and personally eccentric and dubiously sound editor Horace Greeley as their candidate. E. of the massive support of black voters in the Reconstruction South.
Ball valves on the end of refrigeration hoses:
A) Automatically open and close when the hoses are connected and disconnected. B) Only work when connected to a unit with ball valves. C) Are controlled manually by the technician. D) Are electronically controlled by a digital gauge set.
Which of the following control devices is often used in both a primary and a secondary control role?
a. Pressure switches b. Humidistats c. Rupture disks d. Condenser water valves