a) Reduce noise b) Same on copper c) Improve voltage waveform d) Reduce harmonics Ans: (c)
a) 0.995 b) 0.90 c) 0.80 d) 0.70 Ans: (a)
a) Driving torque and excitation b) Excitation and driving torque c) Excitation only d) Driving torques only Ans: (b)
a) Less than 200 V b) Between 200 V 500 V c) 500 V d) Above 500 V Ans: (a)
a) Increasing the current supplied to the field electromagnets b) Reversing the armature rotation c) Increasing armature speed d) Reversing the field polarity Ans: (c)
a) Full armature voltage b) Extra high tension voltage c) Low voltage d) Very high voltage Ans: (c)
a) Reluctance torque b) Pseudo-stationary torque c) Eddy current torque d) Induction generator torque Ans: (d)
a) Phase difference between the two voltage b) Frequency difference between two voltage c) Voltage difference between the two voltage d) Either (a), (b), or (c) Ans: (d)
a) Power factor b) Power output c) Input power d) Terminal voltage Ans: (a)
a) They are synchronized using synchroscope and dark and bright lamp method of synchronization b) Their phase sequence, voltage, frequency and polarity be the same c) Both (a) and (b) d) None of these Ans: (c)