Flashcards
Motor questions
Cards in this deck (8)
- 1calculation for motors P= _/3XVLXILXPFinductive load divided by everything on back of card
- 2calculate motor output power2pieXN(R.P.M)XTORQUE÷60
- 3how many watts equals 1 hp?746W
- 4when the load on a transformer changes from no-load to full-load, there is a voltage drop at the secondary terminals. state a technical reason why?the windings have impedance. when the increased current flows through the impedance a voltage drop occurs across the windings so, the transformer terminal voltage is lower
- 5which type of motor is the direction of rotation changed by reversing the connections to the field windings-universal
-series
motor - 6define the term impedance as it applies to an a.c. circuitIt is the total opposition in ohms(resistance) to the current flow in an AC circuit
- 7which type of motor is the direction of rotation changed by reversing the connections to the start winding-split-phase
-cap start
-cap start, cap run - 8explain the purpose of electrical interlocks in a star/Delta starterto prevent the star and delta contactors closing simultaneously.
if closed at the same time it could cause the motor not to start or a phase to phase short