Deck 10: Motor Starter Circuits

Question 1

Motor control circuits should only be documented with wiring diagrams.

Answer 1

False

Question 2

____ is a condition where the motor is mechanically overloaded beyond its horsepower rating, and that causes the motor to draw more than its rated current.

A)Current overload
B)Motor overload
C)Mechanical overload
D)Horsepower overload

Answer 2

B

Question 3

Overcurrent protection is provided at the point of _______________ for the circuit conductors.

Answer 3

supply

Question 4

Ladder diagrams document only the control circuit wiring.

Question 5

What is the difference between overcurrent protection and overload protection?

Question 6

The overload unit controls the normally closed set of overload contacts, which are connected in the control circuit.

Question 7

Motor control circuits are commonly documented in two different forms; the _______________ diagram and the wiring diagram.

Question 8

Wiring diagrams document the logical operation of the control circuit.

Question 9

The ____ diagram shows the physical connections of the circuit.

A)heater
B)cooler
C)ladder
D)wiring

Question 10

The ____ diagram shows the logical connections and operation of the control circuit.

A)heater
B)cooler
C)ladder
D)wiring

Question 11

Ladder diagrams document the actual physical connections on circuit components.

Question 12

____ electrical conductor(s) that electricians install in electric motor circuits must be protected for both overcurrent and overload conditions.

A)Every
B)Most
C)Some
D)No

Question 13

The overload unit ____ provide the electrical jumper between the line and load sides of the overload unit.

A)heaters
B)coolers
C)spacers
D)pad

Question 14

Overload is a lower intensity current condition caused by a mechanical overload on the motor.

Question 15

Overload protection is provided before the contactor unit and after the motor being protected.

Question 16

Overcurrent is a low intensity fault current condition caused by accidental short-circuits and ground-faults.

Question 17

A( n) _______________-circuit is the unintentional condition when one or more ungrounded phase conductors of a power supply system come in contact with one or more of the other ungrounded phase conductors of that same power supply system.

Question 18

All motor circuits are protected for both overcurrent and overload conditions.

Question 19

____ is the condition where the electrical current in the circuit rises from zero to (theoretically) infinity, instantaneously, because of short-circuits and ground-faults.

A)Overphase
B)Overcondition
C)Overcircuit
D)Overcurrent

Question 20

What is the difference between ladder diagrams and wiring diagrams?