What is the e-e of pipe O?
Fill in the blank(s) with the appropriate word(s).
4' 9-3/8"
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Which type of safety device will keep the electric fuel pump from operating if it is tripped?
A) Anti siphoning valve B) Check valve C) Roll over valve D) Inertia switch
An advantage of a "parallel flow" configuration of ground loops is ____.
A. smaller diameter pipes B. ease of removing trapped air C. simplified flow path D. higher heat transfer per foot
The typical start up sequence for a hot surface ignition system is
A) Combustion blower, indoor blower, igniter, and gas valve all energized simultaneously B) Combustion blower energized, igniter energized and gas valve energized, flames sensed, indoor blower energized after time delay C) Combustion blower pre-purge, igniter energized after a delay, gas valve energized after a delay, flames sensed, indoor blower energized after time delay D) Gas valve and igniter energized, flames sensed, combustion blower and indoor blower energized after time delay
Which of the following MOST accurately lists the advantages of MOS ICs over TTL ICs?
A) Occupy less space, require fewer external connections, are unipolar devices, and normally do not use IC resistor elements B) Occupy less space, operate faster, and are easier to fabricate C) Occupy less space, operate faster, are less expensive to manufacture, and consume less power D) Occupy more space, are less expensive to manufacture, are bipolar devices, and normally do not use IC resistor elements