What type of furnace draft uses two fans to facilitate airflow?
A. Assisted draft
B. Induced draft
C. Natural draft
D. Balanced draft
A. Incorrect. Assisted draft furnaces use rotary blowers, driven by electric motors or steam turbines.
B. Incorrect. Induced draft furnaces use a fan located at the top of the furnace to draw flue gas from the furnace body into the stack.
C. Incorrect. Natural draft furnaces have no mechanical draft or fans.
D. Correct. Balanced draft furnaces use two fans to facilitate airflow.
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The second-order AR filter has feedback coefficients a1=0.9 and a2=0.5 (b0 = 1). When xi = sin(2?i/8), the value of y2 = ________(x.xx).
Analysis: x0=sin(0)=0, x1=sin(?/4)=0.707, x2=sin(?/2)=1. yi = 0.9yi-1 +0.5yi-2 + xi. With zero initial conditions: y0=x0 =1 y1=0.9y0+x1=0.9(1) + 0.707 = 1.607 y2=0.9y1+0.5y0+x2 = 0.9(1.607) + 0.5(1)+ 1 = 2.9463 = 2.95
A refrigerant reclaimed from a system may be charged back into the system from which it came.
Answer the following statement true (T) or false (F)
Women and older people exemplify ____________________ workers, capable of working effectively and productively in the landscape industry
Fill in the blank(s) with correct word
Independent service facilities often provide in-service training for their technicians
A) True B) False