A 10-pole, 50 Hz, 240 V, single phase induction motor runs at 540 RPM while driving rated load. The frequency of induced rotor currents due to backward field is
The frequencies of the stator and rotor currents flowing in the three-phase 8-pole induction motor are 40 Hz and 1 Hz, respectively. The motor speed, in rpm, is ________. (round off to nearest integer).
$$ \text { Consider the table given : } $$
| Constructional feature | Machine type | Mitigation |
| P. Damper bars | S. Induction motor | X. Hunting |
| Q. Skewed rotor slots | T. Transformer | Y. Magnetic locking |
| R. Compensating winding | U. Synchronous machine | Z. Armature reaction |
| V. DC machine |
The correct combination that relates the constructional feature, machine type and mitigation is
The power input to a $500 \mathrm{~V}, 50 \mathrm{~Hz}, 6$ pole, 3 phase induction motor running at 975 rpm is 40 kW . The stator losses are 1 kW . If the total friction and windage losses are 2.025 kW , then the efficiency is
$\_\_\_\_$ $\%$.
GATE EE Subjects
Browse all chapters by subject