Single-Phase Motors

On a capacitor-start/capacitor-run motor (that has 2 capacitors) The start capacitor will be ___________ the size of the run capacitor.

10-15 times larger

Because of the start of the start capacitor, capacitor start motors should be limited to no more than ___________ starts per hour

8

The ideal phase angle difference between the start and run windings on a capacitor start induction run motor is

90 degrees

A 2 phase power system has two voltages which are.......

90 degrees out of phase

If a split-phase motor only hums rather than turns at start-up, the likely cause is __________

A faulty centrifugal switch

Although the universal motor has a wound armature and brushes like a DC motor. it has an added component which is

Compensating winding

Which would be used to disconnect the starting circuit of a split phase motor?

Hot wire relay, centrifugal switch and current relay

Single phase synchronous motors are based on the stator of the shaded pole motor. They operate at a speed which is synchronous with the applied frequency. These motors are also called

Hysteresis

In a purely capacitive circuit, the current __________ the applied voltage by ______________

Leads, 90 degrees

If a motor has a dual voltage rating how would the two windings be connected to operate on the lower of the two supply voltages

Parallell

Coils are made of wire that has both inductive reactance and resistance. The more pure the coil, the more inductive reactance and the less resistance it will have. The ratio of inductive reactance to resistance is what determines the __________ as compared to the applied voltage.

Phase angle

Which type of single phase AC motor has each pole physically divided into 2 sections with the smaller section wrapped in a shorted coil?

Shaded pole

The conductor size for a multi-winding motor shall be based on ____________

The configuration with the highest FLA 28-804

The direction of rotation of a split-phase motor is determined by viewing

The rear or opposite drive end of the motor

The ___________ motor can operate on either AC or DC voltage

Universal

Multispeed fan motors achieve multiple speeds by inserting additional _______ in series with the run winding

Windings

Which type of split-phase motor will have a capacitor in the circuit at all times even when the motor is up to speed?

Capacitor-start capacitor-run

In single-phase motors such as the resistance-start induction-run motor, the start winding can be disconnected by what?

Centrifigal switch

Where a multi-winding motor is connected in a permanent configuration it shall be treated as a _________ winding motor

SIngle

In the shaded pole motor, the shading coil acts like a(n) __________ transformer secondary

Shorted

The capacitor-start capacitor-run motor typically _____________ as compared to a RSIR motor

has a higher starting torque and a better PF

The R-90 copper conductor used to supply a 115V / 1HP / 1ph. motor would have a minimum size of _____________ (term temps are unmarked)

#12 Table 45 - 16A x 1.25(conductor) = 20A 4-006A-Temp Limitations says 60 degrees for equipment rated not more than 100A Table 2 - #12AWG

The minimum size RW90 copper conductor (terms are marked for 75 degrees) used to feed a 5HP 1ph 208V AC cont. duty motor would be ___________

#8 Table 45 - 208V means increase the 28 by 10% so 28x1.10 = 30.8x125% (for conductors) = 38.5 Table 2 says #8

The warren motor is a variation on the shaded pole motor. It operates at _____________ RPM

3600rpm

The maximum overload setting for a 5HP 200 volt single phase motor with a S.F of 1.15 would be _________ amps

40.25 Table 45 - 28 x 1.15 = 32.2 and because the SF is 1.15 you take it at 125% so 32.2x1.25 = 40.25

A split phase motor can have its rotation reversed by switching which leads?

5 & 8

The centrifugal switch on a split-phase motor is ___________ during initial start up

Closed

The output shaft of a stepping motor

Moves through a specific angle for each input pulse

A shaded pole induction motor is considered to be a ___________

Non-reversible motor

Because one set of motor leads are more easily accessible the direction of rotation of a split phase induction motor is normally changed by

Reversing the leads to the start windings

Split phase motors are so named because they operate on a single-phase voltage, but internally they divide the voltage and current paths in such a manner as to create a _____________ magnetic field

Rotating

The ______ winding is made of many turns of small wire and is located at the top of the stator core.

Start

The centrifugal switch controls current flow to the _________ windings

Start

By comparing the vectors for the start and run windings of a split phase motor we can tell alot about the ________ of the motor

Starting torque

In the shaded pole induction motor, the direction of rotation of the magnetic field is

toward the shading coil

In a motor that has a rotating magnetic field, the speed of that magnetic field is referred to as the

Synchronous speed