Electrical Machines
Which of the following motor has negative speed regulation?

 Shunt motor
 Differential compound motor
 Series motor
 Cumulative compound motors

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
Skewing of the rotor in a 3 - Φ squirrel cage induction motor reduces

  noise and parasitic torque, but increase starting and pull-out torque.
  noise, parasitic and starting torque, but increase pull out torque.
  noise and pullout torque, but increase parasitic and starting torque.
  noise, parasitic torque, starting torque and pull out torque.

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
The result of slip test on a 3-phase, 20 KVA, 400 V, 50 Hz connected salient pole alternator is given below- Phase value: Vmax = 100 V, Vmin = 96 V, Imax = 10 A and I min = 7 A. The direct and quadranature axis reactances are respectively

 8.248 and 5.54 Ω.
 8.248 and 9.60 Ω.
 14.28 and 9.60 Ω.
  14.28 and 5.54 Ω.

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
Two 3-phase AC generators are such that one has twice the linear dimensions of the other. The field windings of each are excited to give identical sinusoidal air-gap flux density waveform. Both have the same number of stator slots and identical winding patterns. The conductor/slot in a big generator is K times that of the smaller one. The value of K to get equal no load voltage at same frequency is

 4.
 1/4.
 8.
  1/2.

ANSWER DOWNLOAD EXAMIANS APP