Which of the following statement about D.C. generators is false? Mark as favorite Copy Link Compensating winding in a D.C. machine helps in commutation In a D. C. generator interpoles winding is connected in series with the armature winding Back pitch and front pitch are both odd and approximately equal to the pole pitch Equilizing bus bars are used with parallel running of DC shunt generators Check Answer
Brushes of D.C. machines are made of? Mark as favorite Copy Link carbon soft copper hard copper all of above Check Answer
A separately excited generator as compared to a self-excited generator? Mark as favorite Copy Link is amenable to better voltage control is more stable has exciting current independent of load current has all above features Check Answer
A simple method of increasing the voltage of a D.C. generator is? Mark as favorite Copy Link to increase the length of the armature to decrease the length of the armature to increase the speed of rotation to decrease the speed of rotation Check Answer
In D.C. generators, the cause of rapid brush wear may be? Mark as favorite Copy Link severe sparking rough commutator surface imperfect contact any of the above Check Answer
Which of the following statements is incorrect in D.C. shunt generators about hysteresis loss? Mark as favorite Copy Link It is independent of lamination thickness It can be minimize by laminating the armature It depends upon the supply frequency None of the above Check Answer
According to Fleming’s right-hand rule for finding the direction of induced e.m.f., when middle finger points in the direction of induced e.m.f., fore finger will point in the direction of? Mark as favorite Copy Link motion of conductor lines of force either of the above none of the above Check Answer
A series generator can self-excite? Mark as favorite Copy Link only if the load current is zero only if the load current is not zero irrespective of the value of load current none of the above Check Answer
The resistance of armature winding depends on? Mark as favorite Copy Link length of conductor cross-sectional area of the conductor number of conductors all of the above Check Answer
A sinusoidal voltage of 5 Hz is applied to the field of a shunt generator. The armature voltage wave? Mark as favorite Copy Link will be zero will be of 5 Hz will be of 5 x N Hz will be of N/5 Hz Check Answer