Electrical Machines On switching a DC motor to DC supply mains, it is found to rotate in the direction opposite to that for which it is designed. The DC motor is Differentical compound. have an equal number of electrons and protons. Series shunt. Cummulative compound. Differentical compound. have an equal number of electrons and protons. Series shunt. Cummulative compound. 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. 399 V. 100 V. 50 V. 230.2 V. 399 V. 100 V. 50 V. 230.2 V. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Dummy coils are used for mechanical balancing. increasing efficiency. reducing armature reaction. All of these mechanical balancing. increasing efficiency. reducing armature reaction. All of these ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Armature reaction effect is more in which of the following methods? field weakening method same in both methods None of these armature resistance control field weakening method same in both methods None of these armature resistance control ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In DC generators, the residual magnetism is of the order of 20 %. 2.5 %. 10 %. 15 %. 20 %. 2.5 %. 10 %. 15 %. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A series generator is connected in series to a feeder having 0.5Ω resistance to boost the voltage. The induced voltage is given by Eg = 0.6Ia, Ra = 0.2Ω and Rs = 0.3Ω. Find the voltage boosted by the generator, when delivering 400 Amp? 60 V. 30 V. 90 V. 40 V. 60 V. 30 V. 90 V. 40 V. ANSWER DOWNLOAD EXAMIANS APP
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