Electrical Machines If the applied voltage to a dc machine is 230 V, then the back emf, for maximum power developed, is 200 V 115 V 230 V 460 V 200 V 115 V 230 V 460 V ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In a DC generator if field winding attains the critical resistance the voltage generated will be zero. field winding will burn. machine will generate maximum power. machine will generate maximum voltage. the voltage generated will be zero. field winding will burn. machine will generate maximum power. machine will generate maximum voltage. 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 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. get heated and damaged. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines On which of the following factor/factors the speed of a DC motor depends upon? All of these. Applied voltage. Field flux. Armature current. All of these. Applied voltage. Field flux. Armature current. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A 3 - Φ, 4 pole, 50 Hz induction motor 4 % slip, calculate frequency of the rotor emf? 50 Hz. 3 Hz. 2 Hz. 10 Hz. 50 Hz. 3 Hz. 2 Hz. 10 Hz. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A 500 V, 55 kVA single phase alternator has an effective resistance of 0.5 Ω. An excitation current of 10 A produces 200 A armature current on short circuit and an emf of 450 V on per circuit. The synchronous reactance will be 25.564 Ω. 2.241 Ω. 2.781 Ω. 2.74 Ω. 25.564 Ω. 2.241 Ω. 2.781 Ω. 2.74 Ω. ANSWER DOWNLOAD EXAMIANS APP
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