Zach Stone P.E.
Well-known member
We've made another video available for free on YouTube from our online review course for the electrical power pe exam that you can study from for free.
Induction motor no load and locked rotor test questions can be difficult if you're not familiar with the terminology or where each value comes from.
The below video is a demonstration on how to solve for each of the following values from the test results gathered during a no-load and locked rotor test on a three phase wye connected induction motor:
I) Stator resistance per phase
II) Total no load apparent power
III) Magnetizing reactance
IV) core, winding, and friction resistance
V) Total locked rotor apparent power
VI) Total locked rotor reactive power
VII) leakage reactance
VIII) rotor resistance at locked rotor (same thing as "slip resistance").
This is a longer video. A 6-minute exam problem that you could potentially see on the actual PE exam could be solving for any of the individual quantities above. If you can get comfortable solving for these quantities then you will be in good shape for the PE exam!
Induction motor no load and locked rotor test questions can be difficult if you're not familiar with the terminology or where each value comes from.
The below video is a demonstration on how to solve for each of the following values from the test results gathered during a no-load and locked rotor test on a three phase wye connected induction motor:
I) Stator resistance per phase
II) Total no load apparent power
III) Magnetizing reactance
IV) core, winding, and friction resistance
V) Total locked rotor apparent power
VI) Total locked rotor reactive power
VII) leakage reactance
VIII) rotor resistance at locked rotor (same thing as "slip resistance").
This is a longer video. A 6-minute exam problem that you could potentially see on the actual PE exam could be solving for any of the individual quantities above. If you can get comfortable solving for these quantities then you will be in good shape for the PE exam!
