IDA-201 Unit 17

A motor's speed is determined by ____.

• number of motor poles
• amperage
• voltage
• size

Start windings are placed ____ with the run windings.

• slightly out of phase
• 180 degrees out of phase
• in phase
• in series

The start windings have ____.

• more turns than the run windings
• fewer turns than the run windings
• the same number of turns as the run windings
• larger diameter wire than the run windings

A split-phase has a ____ winding and a ____ winding.

• start, run
• start, common
• common, run
• run, common

When a general duty split-phase motor reaches approximately 75% of its operating speed, the start winding is de-energized by a ____.

• centrifugal switch
• circuit board
• capacitor
• dual voltage switch

A split-phase motor that has a current relay and a start capacitor is called a(n) ____ motor.

• Capacitor Start, Induction Run (CSIR)
• Capacitor Start, Capacitor Run (CSCR)
• Induction Start, Induction Run (ISIR)
• Permanent Split Capacitor (PSC)

When a Capacitor Start Induction Run (CSIR) motor is running and up to speed, what is the total capacitance acting on the motor? (Assume the run capacitor is 5 microfarads and the start capacitor is 20 microfarads, if present.)

• 5 microfarads
• 4 microfarads
• 20 microfarads
• 25 microfarads

A permanent split capacitor (PSC) motor that is running and up to speed will have the start winding ____.

• energized
• de-energized
• in series with the run winding
• removed from the circuit

When a Capacitor Start, Capacitor Run (CSCR) motor initially starts, what is the total capacitance acting on the motor? (Assume the run capacitor is 5 microfarads and the start capacitor is 20 microfarads, if present.)

• 25 microfarads
• 20 microfarads
• 5 microfarads
• 15 microfarads

Capacitors wired in series with the starting winding provide a(n) ____.

• greater starting torque
• longer starting time
• aid in starting three phase motors
• more efficient operation at full load speed