In case of D.C. machines, mechanical losses are primary function of
A). Current
B). Voltage
C). Speed
D). None of above
In a D.C. generator in case the resistance of the field winding is increased, then output voltage will
A). Increase
B). Decrease
C). Remain unaffected
D). Fluctuate heavily
A synchronous motor installed at the receiving end substation operates with such an excitation that it takes power at lagging power factor. Now if the applied voltage of the synchronous motor goes down, the power factor of the synchronous motor will
A). remain same
B). go down
C). improve
D). none of the above
Synchronsizingpower of a synchronous machine is
A). direcly proportional to the synchronous reactance
B). inversely proportional to the synchronous reactance
C). equal to the synchronous reactance
D). none of the above
Armature of a synchronous machine is
A). Of reducing number of slip rings on the rotor
B). Armature is associated with large power as compared to the field circuits
C). Of difficulty of providing high voltage insulation on rotor
D). All of the above reasons