If a low-pass RL filter's cutoff frequency is 20 kHz, its bandwidth is ________
A) 0 Hz B) 20 kHz C) 40 kHz D) unknown
B
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An air conditioning system charged with R-410A is operating with a suction pressure of 130 psig which equates to a 45°F saturation temperature. If the manufacturer calls for a 15°F superheat, what should the suction line temperature be?
A) 45°F + 15°F = 60°F suction line temperature B) 45°F - 15°F = 30°F suction line temperature C) 130 psig + 15°F = 190°F suction line temperature D) 130 psig - 15°F = 115°F suction line temperature
A boom-type concrete pump located in the vicinity of a 15-foot deep excavation should be placed a minimum of _____ feet away from the edge of the excavation.
When a conductive target is within the sensing field of a capacitive proximity detector, ____________________ (the object becomes another electrode, the dielectric constant changes) which causes the capacitance to ____________________ (increase, decrease).
Fill in the blank(s) with the appropriate word(s).
What element is used to produce the electricity in fuel cells?
A. oxygen B. hydrogen C. carbon D. nitrogen