Electrical Machines The low voltage winding of a 400/230 V single phase 50 Hz transformer is to be connected to keep the magnetization current at the same level in both the cases the voltage at 25 Hz should be 115 V 65 V 230 V 460 V 115 V 65 V 230 V 460 V ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The volt-ampere euation for a long-shunt compound motor is given by Vt = Ea + Iara+ ILrs Vt= Ea + Iara Vt= Ea– Iara Vt = Ea + Ia(ra + rs) Vt = Ea + Iara+ ILrs Vt= Ea + Iara Vt= Ea– Iara Vt = Ea + Ia(ra + rs) ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A DC cumulatively compounded motor delivers rated load torque at rated speed. If the series field is short-circuited, then the armature current and speed will decrease and increase respectively both increase increase and decrease respectively both decrease decrease and increase respectively both increase increase and decrease respectively both decrease ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A transformer has resistance and reactance in per unit as 0.01 and 0.04 respectively. Its voltage regulation for 0.8 power factor lagging and leading will be 6% and -4% None of these 4.8% and -3.2% 3.2% and -1.6% 6% and -4% None of these 4.8% and -3.2% 3.2% and -1.6% ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In an alternator, voltage drops occurs in armature resistance and leakage reactance. armature resistance, leakage reactance, armature reaction and earth connection. armature resistance, leakage reactance and armature reaction. armature resistance only. armature resistance and leakage reactance. armature resistance, leakage reactance, armature reaction and earth connection. armature resistance, leakage reactance and armature reaction. armature resistance only. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines If a transformer has turns ratio K, the primary and secondary current are I1 and I2 respectively and magnetizing current and core loss component of no load current Iμ and Iw respectively, then I1 = KI2. I1 = KI2 + Iw. I1 = KI2 + Iw + Iμ.ok I1 = KI2 + Iμ. I1 = KI2. I1 = KI2 + Iw. I1 = KI2 + Iw + Iμ.ok I1 = KI2 + Iμ. ANSWER DOWNLOAD EXAMIANS APP
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