a) DC series motors b) AC series motors c) DC shunt motors d) Low resistance squirrel cage motors e) (c) and (d) both Ans: (e)
a) The second motor will run at its own slip but at voltage of first motor b) The second motor will run at slip frequency and voltage of first motor c) The second motor will run d) The second motor will act as frequency converter Ans: (b)
a) Voltage converter b) Frequency converter c) Current converter d) Power converter Ans: (b)
a) Is the difference between its applied frequency and its frequency of rotation b) Is the difference between of slip-frequency first motor and its frequency of rotation c) (a) or (b) d) None of the above Ans: (c)
a) A b) B c) C d) D Ans: (a)
a) Armature Current b) Magnetic field c) Magnetic field and Magnetic Current d) Speed Ans: (c)
a) Variable excitation to the field of the motor b) Constant excitation to the field of the motor c) A.C. excitation to the field of the motor d) No excitation to the field of the motor Ans: (b)
a) Armature current b) Field current c) Speed d) Magnetic flux Ans: (a)
a) Separately excited generator b) Self-excited generator c) All A.C. generators d) None of them Ans: (b)
a) It will generate maximum voltage b) It will generate maximum power c) It will not develop voltage at all d) None of them Ans: (c)
a) Their polarities must match b) Their phase sequence must match c) Their polarities and voltages must match d) (b) and (c) both Ans: (c)
a) Constant current b) Constant torque c) Constant speed d) Constant magnetic field Ans: (b)
a) Magnetic field b) Armature resistance c) Voltage d) None of the above Ans: (c)
a) True b) False Ans: (a)
a) Universal motor b) Synchronous Motor c) D.C. series motor d) D.C. shunt motor Ans: (b)