a) Three phase alternator, 4 pole wound on 72 slots core b) Three phase alternator, 8 pole wound on 80 slots core c) Three phase alternator, 8 pole wound on 72 slots core d) Three phase alternator, 6 pole wound on 72 slots core Ans: (c)
a) 8 pole synchronous alternator b) 6 pole synchronous alternator c) 4 pole synchronous alternator d) 10 pole synchronous alternator Ans: (b)
a) 10 cycles b) 4 cycles c) 8 cycles d) 16 cycles Ans: (b)
a) 8 pole b) 6 pole c) 4 pole d) 2 pole Ans: (c)
a) The speed of that generator is increased b) The direction that generator is reversed c) The generator takes large share of loads d) The field of that generator is weakened Ans: (c)
a) A single phase induction motor has very high starting torque. b) A single phase induction motor has zero starting torque. c) A single phase starting torque is as good as that of 3 phase induction motor. d) A single phase motor has very small torque but greater than zero. Ans: (b)
a) Primary induced emf b) Secondary induced emf c) Secondary voltage d) Core and copper losses Ans: (b)
a) Low frequency transformers b) High frequency transformers c) 5 kVA, 50 Hz transformers d) None of these Ans: (b)
a) Damper winding on rotor poles b) Damper winding on stator c) (a) or (b) d) None of the above Ans: (a)
a) Fully compensated cross field machine b) Half compensated cross field machine c) Over-compensated cross field machine d) Under-compensated cross field machine Ans: (a)