EG2 Week 3

Generators must rotate in _____ to connect to the transmission network.

• 120 degree angles

• unison

• different phase angle relationships

• 45 degree angles

If the generators are not operating in unison, they cannot be at the same _____ therefore will not parallel.

• watts

• resistance

• current

• voltage

If the generator begins to lead or lag in rotation what should happen?

• protective equipment just outside the generator closes

• protective equipment just outside the generator opens

• the grid shuts down

• kaboom

Tags

NGSS.HS-ETS1-3

NGSS.HS-PS2-5

Operators can also separate the unit from the system when generators lead or lag in rotation.

• true

• false

Three-phase motors design consist of a _____ and a ______.

• conveyor belt/ large production saw

• Stator (rotating part)/ Rotor (stationary part)

• Stator (stationary part)/ rotor (rotating part)

• phase sequence/ A/C motor

When referring to the two stator poles in a three-phase motor. Each phase is wrapped around two stator poles _____ degrees apart.

• 120

• 180

• 240

• 360

Any change in phase sequencing will affect the direction that the motor(s) ____.

• rotate

• work

• Counter- clockwise

• clockwise

If the phase sequencing is unchanged the rotation will remain unchanged.

• True

• false

An undesirable rotation change on a saw mill would cause what?

• Pandamonium

• no effect on the saws, it would cause a voltage issue.

• Saws to spin in the opposite direction

• current and voltage would not allow the saw to operate

Tags

NGSS.HS-PS2-1

If a change in the phase sequencing were to occur at a point in the power delivery system, rotation would be affected ______ from the point of the change.

• Upstream

• downstream

Tags

NGSS.HS-PS3-5