Electrical Machines An induction motor when started on no load does not accelerate up to full speed but runs at 1/7th of the rated speed. The motor is said to be plugging. cogging. crawling. locking. plugging. cogging. crawling. locking. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Cogging of induction motor occurs at low voltage and when stator and rotor poles are equal. high voltage and when stator and rotor poles are not equal. low voltage and when stator and rotor poles are not equal. high voltage and when stator and rotor poles are equal. low voltage and when stator and rotor poles are equal. high voltage and when stator and rotor poles are not equal. low voltage and when stator and rotor poles are not equal. high voltage and when stator and rotor poles are equal. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines When Flemings right hand rule to find the direction of induced emf, the thumb points towards direction of induced emf. direction of motion of the conductor. opposite to the direction of motion of the conductor. direction of flux. direction of induced emf. direction of motion of the conductor. opposite to the direction of motion of the conductor. direction of flux. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Two 3-phase AC generators are such that one has twice the linear dimensions of the other. The field windings of each are excited to give identical sinusoidal air-gap flux density waveform. Both have the same number of stator slots and identical winding patterns. The conductor/slot in a big generator is K times that of the smaller one. The value of K to get equal no load voltage at same frequency is 4. 8. 1/2. 1/4. 4. 8. 1/2. 1/4. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Sparkless commutation can be achieved by employing inter poles. compensating winding. high resistance carbon brushes. any one or more of the above methods. inter poles. compensating winding. high resistance carbon brushes. any one or more of the above methods. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The no load and full load speed of DC motor are 1400 rpm and 1200 rpm respectively. What is the percentage speed regulation of the motor ? 15.30%. 14.28%. 16.67%. 18.25%. 15.30%. 14.28%. 16.67%. 18.25%. ANSWER DOWNLOAD EXAMIANS APP
EXAMIANS