A 3-phase, Y - connected induction motor has a full load slip of 4%. An autotransformer is used to limit the starting current to 4 times the full load current. For such limitation, determine the ratio of the starting torque to full load torque

An 3-phase induction motor(IM) has full load slip = 0.5%. If the rotor circuit resistance is increased so that R2new =2R2old, then the slip at which the motor develops the same full load torque is=.. * ......

A freewheeling DC motor is driven with 1000 rpm and a nominal load torque of 80Nm. The field circuit resistance is 200 and the armature circuit resistance is 0.2 O. The field coils are fed with a zero degree transmission angle through a single-phase fully controlled converter connected to a single-phase 240V source. The armature circuit is fed from a single phase 400V source through another fully controlled converter. Magnetic saturation has been neglected, the motor constant is given as 0.8 V - s / A - rad. Assuming that there is no fluctuation in armature and field current, find the control angle of the converter feeding the armature at nominal load. If you want to leave the question blank, click again on the option you marked.

f The simplicity in construction of a single-stack VR step motor is due to.... 1. Low number of phases, 2. Low used voltage, 3. N, N, 4. Bidirectional rotation, 5- None of previous. g- The synchronous inductor motor has the ability to step when the phase windings are .............. 1. Connected in parallel, 2. Connected in series, 3. Connected in star, 4. Energized with dc, 5- None of previous. h- The speed of multiple-stack VR step motor with continuous stepping is 3.120, 4.5 5- None of previous. 60f T T Resonance conditions distort the torque/speed curve causing a Drop, 3. Ripple, 4. Fluctuation, 5- None of previous. ********** 1. 120f 2p 2. 60f 2p " in torque. 1. Increase, 2. j- The frequency of armature current in 1-phase series motor is 1. =f, 2. f, 4. Zero, 5- None of previous. (f is the supply frequency)