In the accompanying figure, why must the pressure switch be connected as normally closed?
What will be an ideal response?
It must be connected as normally closed because the pressure switch must close when the pressure drops.
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You have three pleasure horses. You have the horses in a pasture 580 feet wide and 820 feet long. You have a five-board high fence along the width in front (580 feet), and the remainder of the fence is constructed of woven wire with a board on top. Woven wire is sold in 20-rod rolls. (Note: 1 rod = 16.5 ft.)
a. How many acres are in the pasture? b. How many linear feet of boards were used? c. How many rolls of wire were used?
TechnicianA says a shop exhaust hose is not needed because newer vehicles run very clean. TechnicianB says the shop's ventilation system should be connected to a vehicle's exhaust pipe when the vehicle is running. Who is correct?
A. A only B. B only C. Both A and B D. Neither A nor B
Which HFC refrigerant has taken the place of R-12 for use in domestic refrigeration?
A. R-134a B. R-404A C. R-409A D. R-410A
In an internal combustion engine, the engine burns fuel inside closed chambers called
A. pistons B. camshafts C. spark plugs D. cylinders