Electrical Machines In DC generators, the residual magnetism is of the order of 2.5 %. 20 %. 15 %. 10 %. 2.5 %. 20 %. 15 %. 10 %. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The demagnetising component of armature reaction in a DC generator results in sparking trouble. reduces generator emf. increases armature speed. reduces inter poles flux density. results in sparking trouble. reduces generator emf. increases armature speed. reduces inter poles flux density. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Find the synchronous reactance of alternators in which a given field current of 200 A on short circuit and a generated emf of 50 V on open circuit. Armature resistance is 0.1 ohm 0.5Ω. 1Ω. 0.25Ω. 0.23Ω. 0.5Ω. 1Ω. 0.25Ω. 0.23Ω. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The current drawn by the armature of DC motor is directly proportional to The torque required. None of above. The speed of motor. The voltage across the terminals. The torque required. None of above. The speed of motor. The voltage across the terminals. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In a 3 - φ induction motor running at full load which of these parameters is stationary with respect to the stator mmf wave? Both rotor and stator winding. Rotor mmf wave. Stator winding. Rotor winding. Both rotor and stator winding. Rotor mmf wave. Stator winding. Rotor winding. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In case the conditions for maximum power for DC motor are established, the efficiency of the motor will be Around 100 %. Around 90 % Any where between 75 % and 90 %. Less than 50 % Around 100 %. Around 90 % Any where between 75 % and 90 %. Less than 50 % ANSWER DOWNLOAD EXAMIANS APP
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