vectors Flashcards
Vector is the term for lines that represent relationships between phases. (The term phasor is used in electrical drawings.)
true
The arrowhead on the end of a vector indicates ?
direction
To represent a wye connection, the vectors are connected ?
tail to tail
Vectors can be added, but they cannot be divided.
false
In a delta configuration, the pointed plus end of one arrow (vector) makes contact with the negative tail of the next arrow.
true
In a delta configuration, if a plus-minus combination comes in contact with another plus-minus combination, a(n) ? will result.
dead short
One advantage of completing a vector drawing of a 3-phase bank prior to physically building it is that it ensures the bank will be built in a logical fashion.
true
Transformer output voltages have ? , ? phase angle, and phase sequence.
magnitude / direction
Phase position and phase sequence (rotation) are usually established at the point of service to the customer.
false
In 3-phase systems, voltage vectors of individual phases are separated by ?
120 degrees
Graphical illustrations using vectors show direction and magnitude.
true
To vector a 3-phase system, it is essential to establish a ? of the phases.
fixed reference
The vector wheel graphically divides a circle into ? increments.
30 degrees
Once a ? for vectoring has been established, it must be maintained throughout a vectoring exercise.
convention
In a star system, the phase angle displacement through a transformer bank (primary to secondary) is either 0° or 160°.
false
