Generally, limit switches are used as ____________________ devices that control the coil of relays and motor starters in control circuits.
Fill in the blank(s) with the appropriate word(s).
pilot
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What type of oil delivery system is recommended when the vacuum required for lifting the oil from the tank to the furnace is 16 in Hg?
A) A two-pipe oil delivery system with a single-stage oil pump B) A single-pipe oil delivery system with a single-stage pump C) A two-pipe oil delivery system with a two-stage oil pump D) A single-pipe oil delivery system with a two-stage oil pump
Answer the following statement(s) true (T) or false (F)
1. Machinery clutches were originally designed to engage very large motors to their loads after the motors had reached running speeds. 2. The single-face clutch consists of two discs. 3. Double-face clutches are available in sizes up to 60 inches in diameter. 4. The magnetic drive can be used as a clutch. 5. A tachometer generator generates a voltage that is exponentially related to its speed.
By the year 2050, scientists predict there will be over ____________________ billion people in the world
Fill in the blank(s) with correct word
Tree destruction sacrifices some of the world's potential for absorbing carbon dioxide and releasing oxygen
Indicate whether the statement is true or false