Testing Equipment and General Electrical
What happens to Resistance, and current in a circuit when a Load is shorted?
Resistance goes down, current goes up!
What does N.O mean?
Normally Open
Name the two wiring configurations for 3 phase motor windings.
Delta and Wye
What voltage should I read with my Black lead at ground and my red lead at the positive side of a 9V battery?
+9V
What does N.C mean?
Normally Closed
In order to reverse the direction of rotation of a 3 phase motor what must I do?
Swap any two of the power connections to the motor windings. For example, Swapping L1 and L3, or L1 and L2 etc
How does your meter measure voltage?
The difference in voltage potential at my leads (Red minus Black)
What computer device primarily uses Ladder Logic as its main Programming Language?
PLC'S!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
What is the standard frequency and voltage for US homes?
120VAC at 60Hz
Before measuring Ohms I must do what?
Ensure power is off/disconnected from the circuit
In a ladder diagram, do we ever have two loads in series?
NO
This type of motor uses a copper band around a stator pole in combination with the stator windings to produce a rotating magnetic field using only single phase power.
Shaded Pole!
When performing a LOTO (Lock out Tag out) What are the steps I must perform in order to properly Lock out a piece of equipment (for ex. a 3 phase motor).
1. Notify your supervisor or coworker for the shutdown request. Make sure to notify all affected employees
2. Deenergize and tag the equipment
3. Lock out the power source
4. Sign that my lock has been placed on the equipment
Mr. Paine will draw a Ladder Diagram for you to troubleshoot. The customer does not know why but, when powering up the circuit he can hear a buzzing sound coming from inside the panel.
Doorbell!
What degree or angle must you cut the flux lines in a generator to produce the peak voltages?
90 and 270!