Electrical Machines In DC generators, the residual magnetism is of the order of 15 %. 2.5 %. 10 %. 20 %. 15 %. 2.5 %. 10 %. 20 %. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The effect of ------------------ on main field flux is armature reaction? armature flux armature current armature mmf All of these armature flux armature current armature mmf All of these ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Skewing of cage rotors offers the following advantages locking tendency is reduced. uniform torque. less noise. all of below. locking tendency is reduced. uniform torque. less noise. all of below. 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 9.60 Ω. 14.28 and 9.60 Ω. 14.28 and 5.54 Ω. 8.248 and 5.54 Ω. 8.248 and 9.60 Ω. 14.28 and 9.60 Ω. 14.28 and 5.54 Ω. 8.248 and 5.54 Ω. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines When a transformer is loaded, the secondary terminal voltage drops. That means power factor is leading. zero. unity. lagging. leading. zero. unity. lagging. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In a DC shunt generator working on load, the brushes are moved forward in the direction of rotation, as a result of this, commutation will improve and terminal voltage will rise . improve but terminal voltage will fall. worsen and terminal voltage will fall worsen and terminal voltage will rise. improve and terminal voltage will rise . improve but terminal voltage will fall. worsen and terminal voltage will fall worsen and terminal voltage will rise. ANSWER DOWNLOAD EXAMIANS APP
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