Electrical Machines If B is flux density, l the length of the conductor and v the velocity of the conductor, then emf is given by Blv. Bl2v. Bl2v2. Blv2. Blv. Bl2v. Bl2v2. Blv2. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Reversing the direction of rotation of split phase motors is done by reversing the terminals of main winding. All of these interchanging the capacitor from starting winding to main winding or vice versa. reversing the terminals of starting winding. reversing the terminals of main winding. All of these interchanging the capacitor from starting winding to main winding or vice versa. reversing the terminals of starting winding. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Two of supply terminals to a 3 - Φ induction motor get interchanged during re-connection after normal maintenance. When switched on the supply, the motor will get heated and damaged. rotate in the same direction as before maintenance. not start at all. rotate in direction opposite to that before maintenance. get heated and damaged. rotate in the same direction as before maintenance. not start at all. rotate in direction opposite to that before maintenance. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Consider the following statements regarding the speed control of dc motors : 1. ward-leonard method is suitable forconstant-torque drives 2. Ward-leonard method is suitable for constant-power drives 3. field-control method facilitates speed control below base speed 4. Armature-resistance control method is more efficient than ward-leanard method 5. Field-control method is suitable for constant-torque drives 6. Armature-resistance control method is suitable for constant-torque drives From these, the correct answer is 1, 4, 6 1, 2, 6 1, 2, 5 1, 3, 5 1, 4, 6 1, 2, 6 1, 2, 5 1, 3, 5 ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In a 3-phase induction motor, if the supply voltage and frequency are reduced by the same ratio, then slip at which maximum torque occurs is more and maximum torque remains constant more and maximum torque decreases less and maximum torque increases less and maximum torque decreases more and maximum torque remains constant more and maximum torque decreases less and maximum torque increases less and maximum torque decreases ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A 3-phase, 2 pole, 12 slot synchronous machine is operating at synchronous speed. Find the slot angle? 30° 20° 18° 60° 30° 20° 18° 60° ANSWER DOWNLOAD EXAMIANS APP
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