Deck 4: Overload Relays

Question 1

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

Answer 1

True

Question 2

How do magnetic type overload relays operate?

Answer 2

Magnetic type overload relays operate by sensing the strength of the magnetic field produced by the current flow to the motor.

Question 3

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

Answer 3

circuit breakers

Question 4

Motor starting current is referred to as ____________________ current.

Question 5

Magnetic type overload relays are sensitive to ambient temperature.

Question 6

What are the two types of thermal overloads?

Question 7

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).

Question 8

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

Question 9

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

Question 10

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

Question 11

Solder melting type overloads are often called solder ____________________ overloads.

Question 12

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

Question 13

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

Question 14

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

Question 15

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