Why do direct spark ignition furnaces and hot-surface ignition furnaces require redundant gas valves?
A) To modulate the gas pressure B) In case one fails to open, the other will.
C) For safety since there is no pilot safety solenoid D) To open the valve slowly
C
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The bearing grease most often specified is rated NLGI ________.
A) #00 B) #0 C) #2 D) #1
Which of the 1960s liberation movements were most significant and enduring? How did African Americans, young whites, Hispanics, workers, women, and gays each experience the 1960s differently? How were their respective experiences of the sixties reflected in their evolving attitudes about interpersonal relationships, life's priorities, moral values, and their individual attitudes and political views about America?
What will be an ideal response?
The substance used to compare the specific gravity of liquids is:
A) Air. B) Ozone. C) Water. D) Carbon dioxide.
The stationary magnet of a DC motor is represented by the _____
a. armature b. field poles c. commutator d. rotor