a) Dissipates energy in armature circuit b) Dissipates energy in field circuit c) Both (a) and (b) d) Supply energy to source Ans: (d)
a) It will start revolving in other direction at low speed b) Motor will stop c) Motor will burn d) None of these Ans: (a)
a) That speed above normal speed can be achieved b) That commutation becomes unsatisfactory c) Its low efficiency d) None of these Ans: (b)
a) A.C. excitation to the field of the motor b) Variable excitation to the field of the motor c) constant excitation to the field of the motor d) no excitation to the field of the motor Ans: (c)
a) increased maintenance cost b) its high initial cost c) its low efficiency at light loads d) all of them Ans: (d)
a) field diverter method b) field control method c) armature resistance control method d) voltage control method Ans: (d)
a) two b) three c) four d) five Ans: (b)
a) wide range of sensitive speed control is required b) wide range of speed control is required c) narrow range of speed control is required d) none of these Ans: (a)