Electrical Machines For standing a DC motor a starter is required because None of these It starts the motor. it limits the starting current to a safe value. it limits the speed of the motor. None of these It starts the motor. it limits the starting current to a safe value. it limits the speed of the motor. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines If the applied voltage of a certain transformer is increased by 50% and the frequency is reduced by 50%, the maximum flux density will (assuming that the magnetic circuit remains unsaturated) changes to 1.5 times the original value changes to three times the original value remain the same as the original changes to 0.5 times the original value changes to 1.5 times the original value changes to three times the original value remain the same as the original changes to 0.5 times the original value ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In a DC generator, the armature reaction results in demagnetization of centers of poles. magnetization of inter poles. demagnetization of leading & magnetization of trailing pole tip. magnetization of leading and demagnetization of trailing pole tip. demagnetization of centers of poles. magnetization of inter poles. demagnetization of leading & magnetization of trailing pole tip. magnetization of leading and demagnetization of trailing pole tip. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines which of the following losses are negligible in blocked rotor test? iron loss copper loss mechanical loss both A and B iron loss copper loss mechanical loss both A and B ANSWER DOWNLOAD EXAMIANS APP
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. Blv2. Bl2v2. Bl2v. Blv. Blv2. Bl2v2. Bl2v. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In a synchronous motor torque or load angle δ ------------- with increase in load remains unaffected None of these decreases increases remains unaffected None of these decreases increases ANSWER DOWNLOAD EXAMIANS APP
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