Electrical Machines In a DC generator, if P be the number of poles and N be the rpm of the rotor, then frequency of magnetic reversals will be PN/3000. PN/2. PN/60. PN/120. PN/3000. PN/2. PN/60. PN/120. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The slight curvature at the lower end of the OCC of a self excited DC generator is due to high speed. residual flux. high field resistance. magnetic inertia. high speed. residual flux. high field resistance. magnetic inertia. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Which of the following machine is invariably provided with forced ventilation? Hermetically sealed motor of refrigerator. Fractional horse power slow speed motor. 50 MW generator in a power plant. Fractional horse power high speed motor. Hermetically sealed motor of refrigerator. Fractional horse power slow speed motor. 50 MW generator in a power plant. Fractional horse power high speed motor. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Inter pole winding is connected in-------------------------- ? series with main poles parallel with armature series with armature parallel with main poles series with main poles parallel with armature series with armature parallel with main poles ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines DC generators are usually designed to develop armature voltages not exceeding 650 V because of the limitations imposed by commutator starters field winding armature winding commutator starters field winding armature winding ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Two 3-phase AC generators are such that one has twice the linear dimensions of the other. The field windings of each are excited to give identical sinusoidal air-gap flux density waveform. Both have the same number of stator slots and identical winding patterns. The conductor/slot in a big generator is K times that of the smaller one. The value of K to get equal no load voltage at same frequency is 1/2. 4. 1/4. 8. 1/2. 4. 1/4. 8. ANSWER DOWNLOAD EXAMIANS APP
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