What are the main components of a magnetic switch used for starting a three-phase AC motor?
What will be an ideal response?
The magnetic switch used for starting has three heavy contacts, one auxiliary contact, three motor overload relays, and an operating coil.
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Answer the following statement(s) true (T) or false (F)
1. The impulse of electricity is very slow. 2. Energy cannot be created or destroyed, and its form cannot be changed. 3. Metric units of measure are used in the electrical field just as they are in most scientific fields. 4. Fixed resistors have only one ohmic value, but it is adjustable. 5. The symbol used to represent a resistor on an electrical schematic is standard.
What is the pressure in psi required to lift water 20 feet?
A) 20 ft × 0.433 lb/ft = 8.66 psi B) 14.7 psi—just enough to overcome atmospheric pressure C) (20 ft × 0.433 lb/ft) 144 in2/ft2 = 0.06 psi D) It is not possible to determine the pressure without knowing the cross sectional area of the pipe.
In hydraulics, what is the machine that creates the mechanical force required to rotate a pump known as?
A. lever B. engine C. bell crank D. prime mover
Semiconductors are known to have a negative temperature coefficient because an increase in temperature will result in which of the following?
A) An increase in the resistance level B) A decrease in resistance only at room temperature C) A decrease in the resistance level D) An increase in resistance only at room temperature