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Electrical Engineering
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 NECĀ® 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.