a) Zero leading b) less than unity c) Unity d) More than unity Ans: (c)
a) Shifting the brush positions b) Using interpoles c) Using a magnetizing pole d) None of these Ans: (a)
a) Synchronous impedance method b) Politer triangle method c) MMF method d) None of these Ans: (b)
a) Speed b) Load c) Field excitation d) Phase sequence Ans: (c)
a) Large number of poles b) Small number of poles c) Small diameters d) Long cores Ans: (a)
a) 60° phase groups b) 120° phase groups c) 180° phase groups d) 240° phase groups Ans: (a)
a) Windage losses b) Operating speed c) Generated voltage per phase d) Waveform of generated voltage Ans: (c)
a) Magnetization of the main field b) Demagnetization of the main field c) Distortion of the main field d) None of these Ans: (c)
a) Machine with excess excitation will burn b) Both machines will start vibrating c) Power output will decrease d) Wattles component will change Ans: (d)
a) Fixed frequencies b) Variable frequencies c) Fixed currents d) Fixed power factors Ans: (a)