Question 1

What are the two types of thermal overloads?

Accepted Answer

Thermal overloads can be divided into two types: solder melting type or solder pot, and bimetal strip.

Question 2

Fuses which are intended to provide both short circuit protection and overload protection are called ____________________ time delay fuses.

Accepted Answer

dual element

Question 3

Magnetic type overload relays are sensitive to ambient temperature.

Accepted Answer

Magnetic type overload relays are not sensitive to ambient temperature; they operate based on magnetic fields generated by the current flowing through them, unlike thermal overload relays which are sensitive to ambient temperature.

Question 4

Thermal overload relays trip faster when located in a cool area than in a warm area.

Accepted Answer

Thermal overload relays are designed to protect motors from overheating by sensing the heat generated by the motor itself. Their tripping time is primarily influenced by the motor's current and the heat it generates, not the ambient temperature where the relay is located.

Question 5

Fuses and ____________________ are designed to protect the circuit from a direct ground or short-circuit condition.

Accepted Answer

The answer of Fuses and ____________________ are designed to protect...

Question 6

What does it mean for a current transformer to have a ratio of 150:5?

Accepted Answer

The answer of What does it mean for a current...

Question 7

How do magnetic type overload relays operate?

Accepted Answer

The answer of How do magnetic type overload relays operate?...

Question 8

One common use for the normally open set of contacts on an overload relay is to provide an input signal to a programmable logic controller (PLC).

Accepted Answer

The normally open contacts on an overload relay can indeed be used to provide an input signal to a PLC, indicating an overload condition and allowing the PLC to take appropriate action, such as shutting down the system or alerting an operator.

Question 9

Solder melting type overloads are often called solder ____________________ overloads.

Accepted Answer

The answer of Solder melting type overloads are often called...

Question 10

Motor starting current is referred to as ____________________ current.

Accepted Answer

The answer of Motor starting current is referred to as...

Question 11

Overload relays are designed to open the circuit when the current becomes 115 percent to 125 percent of the motor full load current.

Accepted Answer

Overload relays are designed to protect motors by opening the circuit when the current exceeds 115% to 125% of the motor's full load current, preventing overheating and potential damage.

Question 12

Magnetic overload relays can be divided into two major types: electronic and ____________________.

Accepted Answer

The answer of Magnetic overload relays can be divided into...

Question 13

Overload relays are divided into two separate sections. What are the two sections?

Accepted Answer

The answer of Overload relays are divided into two separate...

Question 14

What are the elements of a single pole double throw switch arrangement?

Accepted Answer

The answer of What are the elements of a single...

Question 15

Many bimetal strip type overload relays can be set for either manual or automatic reset.

Accepted Answer

Bimetal strip type overload relays often come with a feature that allows them to be set for either manual reset, where the relay must be manually reset by an operator after a trip, or automatic reset, where the relay automatically resets itself once the overload condition is cleared and the device cools down.

Quiz 4: Overload Relays