Brakes range in size from approximately 1 inch to ____ inches in diameter.
a. 6
b. 12
c. 30
d. 60
c. 30
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A stack switch is a heat-actuated control that uses the stack temperature to indicate that the oil burner has or has not established a flame.
Answer the following statement true (T) or false (F)
A command signal, sometimes called the ____ or reference signal, is programmed into the DC drive and sets the desired operating speed of a DC motor.
A. steady state B. target C. set point D. encoder
A stair with a total rise of 7'-7" and a total run of 9'-0", with the stairwell header used as the last riser,
requires _____ treads with a _____ unit run. a) 11 treads; 9" wide b) 11 treads; 9-1/2"wide c) 12 treads; 9" wide d) 12 treads; 9-1/2" wide
When do the switches on a contactor change position?
A) When both the coil and switches are energized B) When they are energized C) When the coil is energized D) When either the coil or the switches are energized