Polyphase Alternating Current (Mod.5 Sect.1 Part 4)

Frage	Antworten
Any Ac system containing more than one phase is considered a _____ system.	polyphase
A _______ alternator has 2 groups of coils. Each coil generates an AC voltage	two-phase
In a two-phase alternator, the 2 groups of coils are physically arranged at 90 degree angles. Because of this, the 2 generated voltages are _____ phase with each other, but are 90 degrees ______ phase with each other.	not in, out of
In a two-phase alternator, the phase angle between the 2 generated voltages is ___ degrees. (phase angle represented by Greek letter phi)	90
A ________ alternator has three groups of coils all arranged 120 degrees apart.	three-phase
In a three-phase alternator, 3 separate voltages are generated, and the phase difference is ____ degrees.	120
Typically, you'll measure ___ VAC or ___ VAC across the terminals of a single-phase system.	220, 480
_______ systems are typically used in non-industrial places (houses etc).	single-phase
The most commonly used polyphase system in industry is the _______ system.	three-phase
Since the max values of of the 3 voltages of a three-phase system occur at different the voltages overlap and so provide a _____ output power than a single-phase system.	smoother
Single-phase can also be called ____-phase.	split
Current is carried to the load with ____ wires.	line
Three-phase systems are classified as three-wire, four-wire etc. according to the number of ____ wires.	line
A _____ system has equal voltages, currents, and power factors in all lines.	balanced
The voltage across any phase winding is the _____ voltage.	phase
The voltage across any two wires in a system is the ____ voltage for those two wires.	line
In a Y-connected system, the _____ voltage equals 1.732 times the phase voltage of a single winding.	line
In a Y-connected system, ____ current equals the ____ current.	line, phase
The three types of phase winding connection are ____, ____, and ____.	star, Y, Δ
The three phase windings of a ____ system are connected in a closed loop similar to the greek letter deltas (Δ), which gives the system its name.	delta
In a delta connected system, the ____ voltage equals the ____ voltage.	line, phase
In a delta connected system, the ____ current equals 1.732 times the current in any phase ______.	line, winding

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Polyphase Alternating Current (Mod.5 Sect.1 Part 4)

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