Electrical Machines If the load current and flux of a DC motor are held constant and voltage applied across it armature is increased by 5%, the speed of the motor will Reduce by 5%. Remain unchanged. Depends on other factor. Increase by 5%. Reduce by 5%. Remain unchanged. Depends on other factor. Increase by 5%. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A synchronous machine has P number of poles, find the relation between electrical angular momentum (ωe) and mechanical angular momentum (ωm)? ωe = P/2*ωm ωe = P*ωm ωe = 2/P*ωm ωe = ωm ωe = P/2*ωm ωe = P*ωm ωe = 2/P*ωm ωe = ωm ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines For 250 volt DC Shunt Motor the armature and field resistance are 0.5 ohm and 250 ohm respectively. What will be the back e.m.f. produced when it takes a load current of 21A. 280 V. 220 V. 240 V. 150 V. 280 V. 220 V. 240 V. 150 V. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The direction of rotation of a DC motor can be determined by Fleming's left hand rule. Fleming's right hand rule. Lenz's law. Ampere's law. Fleming's left hand rule. Fleming's right hand rule. Lenz's law. Ampere's law. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In synchronous generator a synchronous dead load (lamp, furnaces etc) has no ____________ hence it has no natural frequency of oscillation. mechanical rotatory system. synchronizing power co efficient. restoring torque. damping torque. mechanical rotatory system. synchronizing power co efficient. restoring torque. damping torque. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A commutator in dc machine provide ----------------- rectification? full wave controlled half wave full wave half wave controlled full wave controlled half wave full wave half wave controlled ANSWER DOWNLOAD EXAMIANS APP
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