Briefly describe the CEMF levels that occur with the changes in motor armature rotation.
What will be an ideal response?
When there is no current in the circuit, the motor armature is motionless and the CEMF is zero. The starting current is very high because only the ohmic resistance of the armature limits the current. As the armature starts to rotate, the CEMF increases and the line current decreases. When the speed stops increasing, the value of the CEMF approaches the value of the applied voltage but is never equal to it.
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List various methods of providing attic ventilation.
What will be an ideal response?
____ control involves using some other living organism, either plant or animal, to control aquatic plants
A) Biological B) Chemical C) ?Watershed D) Sampling
The future worth in year 8 for the cash flows shown is $20,000. At an interest rate of 10% per year, what is the value, x, of the cash flow in year 4?
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How can negative room pressure create a hazardous situation in a house with combustion appliances?
A) The gas pressure may be affected. B) The appliances may burn excessively hot. C) All the heat can be sucked out of the room through the vent. D) Combustion products can spill into the house.