Question 1

Motor control circuits should only be documented with wiring diagrams.

Accepted Answer

Motor control circuits can also be documented with ladder diagrams, block diagrams, or even textual descriptions.

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

Accepted Answer

Motor overload is a condition where the motor is mechanically overloaded beyond its horsepower rating, causing it to draw more current than its rated current.

Question 3

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

Accepted Answer

supply

Question 4

Ladder diagrams document only the control circuit wiring.

Accepted Answer

Ladder diagrams are a type of electrical diagram used in industrial automation and control systems. They document the control circuit wiring, which includes the electrical connections and components used to control machines and processes. They are typically used to depict the sequences of operations and the logic used to control various actions, such as turning motors on and off, opening and closing valves, and monitoring sensors. Ladder diagrams are not used to document power circuits or other types of electrical systems.

Question 5

What is the difference between overcurrent protection and overload protection?

Accepted Answer

The answer of What is the difference between overcurrent protection...

Question 6

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

Accepted Answer

The statement is correct as the overload unit is responsible for controlling the overload contacts, which are normally closed and form a part of the control circuit.

Question 7

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

Accepted Answer

The answer of Motor control circuits are commonly documented in...

Question 8

Wiring diagrams document the logical operation of the control circuit.

Accepted Answer

The answer of Wiring diagrams document the logical operation of...

Question 9

The ____ diagram shows the physical connections of the circuit.
A)heater
B)cooler
C)ladder
D)wiring

Accepted Answer

The wiring diagram shows the physical connections of a circuit, including the wiring and components. The other options (heater, cooler, ladder) do not relate to the physical connections of a circuit.

Question 10

The ____ diagram shows the logical connections and operation of the control circuit.
A)heater
B)cooler
C)ladder
D)wiring

Accepted Answer

Ladder diagrams are commonly used in control circuits to depict the logic of electrical components and their connections.

Question 11

Ladder diagrams document the actual physical connections on circuit components.

Accepted Answer

Ladder diagrams are a type of electrical schematic diagram that depict the logical relationships and functions of electric circuits, typically using standardized symbols. They do not document the physical connections of 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

Accepted Answer

It is important to protect every electrical conductor in electric motor circuits for both overcurrent and overload conditions in order to ensure safety and prevent damage to the motor and circuitry.

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

Accepted Answer

Heaters are designed to provide electrical resistance and act as fuses in an overload unit. They are responsible for cutting off the electric power supply in the event of an overload, thus protecting the circuit. Heaters do not provide electrical jumpers or connections between line and load sides, so options B, C, and D are incorrect.

Question 14

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

Accepted Answer

Overload occurs when the motor is overloaded and is not able to handle the load, causing a lower intensity current condition.

Question 15

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

Accepted Answer

Overload protection is typically provided after the contactor and before the motor being protected to ensure the motor does not draw excessive current that could lead to overheating or damage.

Question 16

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

Accepted Answer

Overcurrent includes any condition where the current exceeds the rated current of equipment or the capacity of the conductors, which can be caused by overloads, short circuits, or ground faults, not exclusively low intensity fault currents.

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.

Accepted Answer

The answer of A( n) _______________-circuit is the unintentional condition...

Question 18

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

Accepted Answer

It is a common practice to protect motor circuits for both overcurrent and overload conditions to prevent damage to the motor and its associated equipment. Overcurrent protection is typically provided by a fuse or circuit breaker, while overload protection is usually achieved with a thermal overload relay or motor circuit protector.

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

Accepted Answer

Overcurrent occurs when the electrical current in the circuit rises from zero to (theoretically) infinity, instantaneously, because of short-circuits and ground faults.

Question 20

What is the difference between ladder diagrams and wiring diagrams?

Accepted Answer

The answer of What is the difference between ladder diagrams...

Quiz 10: Motor Starter Circuits