EETC Industrial Electrical Controls Flashcards
Mid-Term Review
When does a ground fault occur?
When one of the phases become grounded.
Removing all metal jewelry, keeping tools and test equipment organized, and working with one hand when possible are examples of…
Basic safety rules when working with electricity.
What must be considered when selecting overcurrent protection devices for a motor control circuit?
Rated full-load current of the motor
This ensures that the protection devices are appropriately rated to handle the motor’s operational current.
What is the service factor on a motor nameplate used for?
To determine how much output power a motor can safely produce above its rated output.
Speed control, reversing, and start up control are all functions of a…
Motor
Controllers, short circuit protection, and a disconnect are all basic requirements for a…
Typical motor installation
The type of manual motor starter used for a three phase motor is a…
Integral horsepower starter
On a manual starter, what will prevent the automatic restart of a motor when recovering from a power loss?
Undervoltage protection
Two types of overload protection are…
Solid state and magnetic
What is the relationship between the input voltage and output voltage based on?
Turns ratio
Auxiliary contacts, coils, and overloads are components of a…
Magnetic motor starter
Typical input devices used for two wire control circuits are…
Pressure switches, float switches, and proximity switches
What does a “push to test pilot light” allow the operator to do?
To test the indicator bulb to make sure it works.
All methods of testing a component are…
Out of circuit test, mechanical test, and in circuit test
A bulb shorted out is a cause of a bad indicator lamp. True or False?
False
If none of the contacts of a manual switch change status when the operator is activated, the most common problem is..
A mechanical problem with the operator.
What would you measure to test a relay coil out of circuit
Resistance
Improper ventilation of a motor, motor is single phasing, and a motor is overloaded are all causes for a motor to…
Overheat
Input devices allow you to control when…
The current will flow in a circuit
One method of de-energizing a seal in circuit is with a…
Stop pushbutton
When a relay is connected so that it continues to energize itself after a momentary input is removed, the circuit is called a…
Seal-in circuit
What do you call a visual shorthand where each component is represented by a standard symbol, helpful in troubleshooting, and shows how all the components are connected in a circuit?
Electrical schematic
NAND, NOT, and OR are all types of…
Control logic
What can you check for while checking a transformer with an ohmmeter?
Coils that are shorted to the core, opens in coils, and shorts between coils.
