Electrical Machines What is the increase in the torque expressed as percentage of initial torque, if current drawn by the dc series motor is increased from 10A to 11A? 21% 11% 41% 10% 21% 11% 41% 10% ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Poles of DC machine are often laminated to reduce pulsation loss. dissipate more heat. reduce armature reaction. reduce iron weight. reduce pulsation loss. dissipate more heat. reduce armature reaction. reduce iron weight. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In DC machine torque is proportional to which of the following? None of these flux(φ) both A and B armature current(Ia) None of these flux(φ) both A and B armature current(Ia) ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A 3-phase, alternator has generated emf per phase of 230 V with 10% 3rd harmonic and 6% 5th harmonic content. Calculate rms line voltage for star connection. 100 V. 230.2 V. 399 V. 50 V. 100 V. 230.2 V. 399 V. 50 V. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines For a standard frequency the machine operates at a particular speed known as synchronous speed. slip speed. any of the above. normal speed. synchronous speed. slip speed. any of the above. normal speed. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The result of slip test on a 3-phase, 20 KVA, 400 V, 50 Hz connected salient pole alternator is given below- Phase value: Vmax = 100 V, Vmin = 96 V, Imax = 10 A and I min = 7 A. The direct and quadranature axis reactances are respectively 8.248 and 5.54 Ω. 14.28 and 9.60 Ω. 14.28 and 5.54 Ω. 8.248 and 9.60 Ω. 8.248 and 5.54 Ω. 14.28 and 9.60 Ω. 14.28 and 5.54 Ω. 8.248 and 9.60 Ω. ANSWER DOWNLOAD EXAMIANS APP
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