Deck 5: Electric Motor Connections

Question 1

It is most common for ____ motors to use terminal blocks for both single-phase and three-phase motors.

A)IEC
B)NEMA
C)magnetic
D)reversible

Answer 1

A

Question 2

NEMA three-phase motors normally use open-ended lead wires marked with the ____ label system in the conduit box.

A)B
B)D
C)S
D)T

Answer 2

D

Question 3

_______________ uses the terms clockwise and counter-clockwise to discuss the direction of rotation for electric motors.

Answer 3

NEMA

Question 4

The voltage measured from one line to the common point with another coil winding is called the ____ voltage.

A)phase
B)delta
C)Start
D)connector

Question 5

Three-phase three-lead induction motors are manufactured in either a wye or ____ configuration, with a single voltage.

A)alpha
B)beta
C)Delta
D)Gamma

Question 6

The ____ six-lead motor is popular because of its dual-voltage rating capability.

A)IEC
B)NEMA
C)WYE
D)voltage

Question 7

The ____ standard defines other mounting and operating characteristics of the motor, and leaves the details of how the other requirements are accomplished up to each individual motor manufacturer.

A)IEC
B)NEMA
C)ladder rung
D)motor

Question 8

Whenever connecting any motor, it is always best to use the _______________ information provided by the manufacturer.

Question 9

When a nine-lead delta connected motor is wired for low voltage, the phase coils are connected in ____.

A)conjunction
B)pairs
C)parallel
D)series

Question 10

One way to identify wires is by referencing the ____.

A)labels
B)diagram
C)ladder run
D)color code

Question 11

Motors cost ____ to operate on low voltages as high voltages.

A)the same
B)more
C)less
D)double

Question 12

NEMA designates individual coil winding leads with the numbers 1 to ____.

A)4
B)8
C)12
D)16

Question 13

The purpose of starting the motor in the ____ configuration is to limit the locked-rotor starting current of these very large motors.

A)NEMA
B)IEC
C)WYE
D)voltage

Question 14

The most common single-phase motor the construction electrician will encounter in the field is called _______________.

Question 15

It is most common for NEMA motors to use _______________ blocks in the front end bell for single-phase motors.

Question 16

When a nine-lead delta connected motor is wired for high voltage, the phase coils are connected in ____.

A)conjunction
B)pairs
C)parallel
D)series

Question 17

Single-phase capacitor-start and capacitor-run motors have a paper and foil type capacitor for _______________.

Question 18

The addition of the capacitor in the auxiliary winding will cause a greater ____ between the main run winding and the auxiliary winding, which will improve operating torque.

A)single-phase
B)phase-shift
C)voltage
D)capacitor

Question 19

Motors manufactured under the _______________ standard will always have well defined and standardized connection terminal wire markings; the "T", for terminal, marking system.

Question 20

Single-phase capacitor-start and capacitor-run motors have an AC electrolytic type capacitor for _______________.

Question 21

The term for starting and stopping a three-phase motor to determine the intended direction of rotation is called _______________.

Question 22

How do NEMA and IEC motors define the direction of rotation for electric motors?

Question 23

For the installations where it is unacceptable for a three-phase induction motor to turn the wrong direction, a motor rotation _______________ is used to pre-determine the correct direction of rotation.

Question 24

What are identifiers on motors that are manufactured under the NEMA standard and IEC standard that enable you to differentiate them?