a) Adds to the supply voltage b) Regulates its armature voltage c) Helps in energy conversion d) Usually exceeds the supply voltage Ans: (c)
a) Welded to the shaft b) Keyed to the shaft c) Soldered to the shaft d) Both to the shaft Ans: (b)
a) Set of screws b) Key c) Soldering d) Welding Ans: (a)
a) Efficiency b) Speed regulation c) Starting torque d) Running torque Ans: (a)
a) To reduce hysteresis loss b) To reduce eddy current loss c) To reduce the cost of core d) To reduce the mass of the armature Ans: (b)
a) 0.1Ω b) 2Ω c) 20Ω d) 400Ω Ans: (a)
a) power input mainus copper loss b) armature current multiplied by back emf c) armature current multiplied by supply emf d) power input minus mechanical loss Ans: (b)
a) Increases proportionately b) Remains constant c) Increases slightly d) Reduces slightly Ans: (d)
a) It draws very current b) It develops excessive speed and get damaged c) There results heavy sparking at the brushes d) Circuit gets open circuited Ans: (b)
a) Shunt motor b) Series motor c) Cumulative compound motor d) Differential compound motor Ans: (b)