Electrical Machines The material used for commutator brushes is mostly cast iron. mica. carbon. copper. cast iron. mica. carbon. copper. ANSWER DOWNLOAD EXAMIANS APP
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/2. PN/3000. PN/120. PN/60. PN/2. PN/3000. PN/120. PN/60. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Maximum power developed by a synchronous motor depends on supply voltage and load angle supply voltage, load angle and excitation excitation and load angle supply voltage and excitation supply voltage and load angle supply voltage, load angle and excitation excitation and load angle supply voltage and excitation ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The output power of a dc motor is given by none of these. EIa. EbIa. EbIa2. none of these. EIa. EbIa. EbIa2. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The armature mmf of a DC machine has triangular space distribution and rotates at the speed of armature. triangular space distribution and is stationary in space. stepped distribution and rotates at the speed of armature. trapezoidal space distribution and is stationary in space. triangular space distribution and rotates at the speed of armature. triangular space distribution and is stationary in space. stepped distribution and rotates at the speed of armature. trapezoidal space distribution and is stationary in space. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines With the increase in speed of a DC motor back emf falls and line current increases. both back emf as well as line current fall. back emf increases but line current falls. both back emf as well as line current increase. back emf falls and line current increases. both back emf as well as line current fall. back emf increases but line current falls. both back emf as well as line current increase. ANSWER DOWNLOAD EXAMIANS APP
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