Electrical Engineering Questions
Explore questions in the Electrical Engineering category that you can ask Spark.E!
_______ are intended to open the circuit when the current exceeds the full-load current rating of the motor by 115 percent to 125 percent.
Most motor circuits are protected by dual-element time-delay fuses or ______.
After the conductors have been installed in conduits or raceways, it is accepted practice to test the installation for grounds and shorts. This test requires a(n) _________.
If a contact is to be drawn ____________ it is drawn so that the movable contact is above and touching the stationary contact.
Air-conditioning and refrigeration equipment is required by NEC® 440.4(A) and (B) to be marked with a ______ marked with the maker's name, the rating in volts, frequency and number of phases, and other information.
What does the abbreviation NO stand for with reference to switch contacts?
The _____ control circuit is often referred to as the basic circuit.
The _______ current is determined by the manufacturer of the hermetic refrigerant motor compressor by testing at rated refrigerant pressure, temperature conditions, and voltage.
If conductors are to be used in a location with a higher ambient temperature, the ampacity of the conductor must be _______
______________________diagrams show components in their electrical sequence without regard for physical location.
In a pure inductive load the current will lag the voltage by _______ degrees.
In most instances, the rated load-current (RLA) is at least equal to _____ percent of the hermetic refrigerant motor- compressor's maximum continuous current (MCC).
Most capacitors used in industry, especially for power factor correction, are called ______ capacitors.
Connections between the current and potential transformers in the high-voltage section of the unit substation and the autotransformer and meter sockets in the cabinet are made with size 12_______ wire.
One option for protecting a motor-compressor from overloads and failure to start is to use a time-delay fuse or inverse- time circuit breaker rated at not more than ______ percent of the rated load current.
A device called a _______ provides a reliable method of terminating a high-voltage cable
The ______ of a transformer is the winding that is connected to a voltage source.
_________ compressors are usually used in large installations.
The ampere rating of the disconnecting means for HVAC equipment must be at least ____ percent of the sum of all the individual loads within the equipment.
If the primary current is less than two amperes for a transformer rated at 600 volts or less, the short-circuit protective device can be set at not more than _____ percent of this value.