Electrical Machines Pole changing methods are suitable only for ___________ type induction motor. none of these. wound. linear. cage. none of these. wound. linear. cage. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A commutator in DC machines can 1. provide half-wave rectification 2. Provide full-wave rectification 3. convert ac to dc 4. Convert dc to ac 5. provide controlled full-wave rectification From these, the correct answer is 1, 2, 3 2, 3 ,5 2, 3, 4 2, 3, 4, 5 1, 2, 3 2, 3 ,5 2, 3, 4 2, 3, 4, 5 ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines For a DC Shunt Motor having armature resistance of 0.5 Ω and 2A armature current at no-load, when the armature current is changed to 20A at loaded condition the speed is 1000 r.p.m. What is the speed at no-load? 4575.4 r.p.m. 963.8 r.p.m. 1037.5 r.p.m. 1130 r.p.m. 4575.4 r.p.m. 963.8 r.p.m. 1037.5 r.p.m. 1130 r.p.m. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A belt-driven cumulatively-compound dc generator is delivering power to the dc mains. If the Belt snaps then the machine will run as a differentially compounded motor in the same direction cumulative compounded motor in the same direction differentially compounded motor in the opposite direction cumulative compounded motor in opposite direction differentially compounded motor in the same direction cumulative compounded motor in the same direction differentially compounded motor in the opposite direction cumulative compounded motor in opposite direction ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The speed of stator rotating magnetic field (RMF) with respect to rotor is Ns S.Ns Zero Nr Ns S.Ns Zero Nr ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines If residual magnetism of a shunt generator is destroyed accidentally it may be restored by connecting its shunt field to an AC source. in reverse. to earth. to a DC source. to an AC source. in reverse. to earth. to a DC source. ANSWER DOWNLOAD EXAMIANS APP
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