Electrical Machines The power factor of an induction motor operating at no load will have a value around 0.9 lag 0.2 lead 0.2 lag unity 0.9 lag 0.2 lead 0.2 lag unity ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines An inverted V-curve of synchronous motor shows the variation of All of these power factor and supply voltage during hunting power factor and dc excitation at constant load supply voltage and field current at constant excitation All of these power factor and supply voltage during hunting power factor and dc excitation at constant load supply voltage and field current at constant excitation ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In case of induction motors the ratio of length to pole pitch for minimum cost, is taken as 1.5 to 2. 1.0. 2 to 3. 3 to 5. 1.5 to 2. 1.0. 2 to 3. 3 to 5. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In a DC motor under constant terminal voltage what is the relation between torque (Te) and power (P) T∝ P² T is independent of P T∝ P T∝ P³ T∝ P² T is independent of P T∝ P T∝ P³ ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines What is/are the necessary conditions for voltage build up in self excited generator? Field winding should be properly connected to armature winding. Poles should contain residual flux. Field winding resistance should be less than critical resistance. All of these Field winding should be properly connected to armature winding. Poles should contain residual flux. Field winding resistance should be less than critical resistance. All of these ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Direct-on-line (DOL) starters are not suitable for starting large DC motors, because the motor may not start. the starting torque becomes low. the motor may run away. the starting current will be enormously high. the motor may not start. the starting torque becomes low. the motor may run away. the starting current will be enormously high. ANSWER DOWNLOAD EXAMIANS APP
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