welcome back week 9 ACR206

1.     SCR functions –

•                                                     i.     Rectifies AC supply into pulsating direct current

• Controls amount of current that flows through DC motor armature

• both

• neither

Operator control

• Start, stop, and change motor direction and speed

• Start, stop, and change motor size and character

• Start, stop, and change motor attention and speed

• Start, stop, and change flow direction and speed

Field current speed control:

• 1.     Control motor speed by changing field stability

• 1.     Control motor speed by changing field color

• 1.     Control motor speed by changing field current

• 1.     Control motor speed by changing field rectification

IR compensation:

• Used to cancel an internal voltage drop when load on motor increases

• Used to compensate for an internal voltage drop when load on motor decreases

• Used to compensate for an external voltage drop when load on motor increases

• Used to compensate for an internal voltage drop when load on motor increases

DC motor drives - Control either:

• permanent magnet or shunt field wound degrees

• permanent magnet or shunt field wound motors

• permanent magnet or shunt field wound bandages

• permanent magnet or shunt field warrior runs

Speed Regulator is:

• Voltage regulator: Consists of two transistors: R8 and R9 connected across output of bridge rectifier

• Voltage regulator: Consists of two resistors: R8 and R9 Connected across output of bridge resistor

• Voltage regulator: Consists of two resistors: R8 and R9 Connected across output of bridge rectifier

• Voltage regulator: Consists of two resistors: R8 and R9 Connected across output of bridge transistor

1.     Methods used to monitor motor speed:

• a.     Internal

• a.     Existential

• both

• neither

1.     Variable-Voltage DC Drive Circuits: (Mark all correct answers

• Voltage regulator

• a.     IR compensation

• a.     Current limiting

• a.     High-/low-speed adjustment

• a.     Acceleration/deceleration adjustment

1.     Motor load categories:

• a.     Constant-torque load

• b.     Constant-horsepower load

• c.      Variable-torque load

• all of the above

• none of the above

1.     Identify two classifications of motor braking techniques and describe the operation of each type.

(mark all that apply)

• Dynamic braking: Uses a resistor to absorb kinetic energy from rotating armature and the load to which it is connected

• Regenerative braking: Power from kinetic energy is returned to power supply

• Dynamic braking: Power from kinetic energy is returned to power supply

• -Regenerative Uses a resistor to absorb kinetic energy from rotating armature and the load to which it is connected