Explain how border plants can help in insect control
What will be an ideal response?
The borders serve to provide an alternative crop for the insects and the idea is that the insects attack the plants around the border and not the crop. Border plants are usually perennials that don't have to be planted each year and must be plants that insects prefer to the crop plants.
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Resistors on starters with three or more steps of acceleration limit the current inrush to ____ percent at the point of initial acceleration.
a. 110 b. 130 c. 150 d. 170
If a sewage pump or ejector receives discharge from either a water closet or urinal, it must have a minimum capacity of ____ gallons per minute.
a. 10 b. 15 c. 20 d. 25
Why are building drains and sewers capable of carrying heavier loads than branch drains?
What will be an ideal response?
PROBLEM 3.151 A steel pipe of 12-in. outer diameter is fabricated from -thick plate by welding along a helix which forms an angle of 45? with a plane perpendicular to the axis of the pipe. Knowing that the maximum allowable tensile stress in the weld is 12 ksi, determine the largest torque that can be applied to the pipe.
