Electrical Machines In a DC machine, the angle between the stator and rotor fields is dependent upon the load. 90o. 0o. 180o. dependent upon the load. 90o. 0o. 180o. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Which type of bearing is provided in small induction motors to support the rotor shaft? None of these Ball bearings. Bush bearings. Cast iron bearings. None of these Ball bearings. Bush bearings. Cast iron bearings. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The speed regulation of a DC motor is given as NnL − NfL. NnL/NfL. (NnL − NfL)/NfL. (NfL − NnL)/NnL. NnL − NfL. NnL/NfL. (NnL − NfL)/NfL. (NfL − NnL)/NnL. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The direction of generated emf in the armature coil of a DC machine is 1. the same as that of the current in a generator 2. the same as that of the current in a motor 3. opposite to that of the current in a generator 4. opposite to that of the current in a motor From these, the correct answer is 1, 3 2, 3 2, 4 1, 4 1, 3 2, 3 2, 4 1, 4 ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The air gap between stator and the rotor of the 3 - φ induction motor is kept as wide as possible. depends on the material of stator and the rotor. air gap does not matter. as small as possible. as wide as possible. depends on the material of stator and the rotor. air gap does not matter. as small as possible. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines If an additional resistance is connected in series with a DC series motor operating at rated speed, the speed of the motor will Reduce. Oscillate around the normal speed. Remain unaltered. Increase. Reduce. Oscillate around the normal speed. Remain unaltered. Increase. ANSWER DOWNLOAD EXAMIANS APP
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