Electrical Machines
A dc series motor driving and electric train faces a constant power load. It is running at rated speed and rated voltage. If the speed has to be brought down to 0.25 p.u. the supply voltage has to be approximately brought down to

  0.5 p.u
  0.25 p.u
  0.75 p.u
  0.125 p.u

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
Torque angle of a synchorous machine operating from a constant voltage bus is usually defined as the space angle between

 Rotor mmf wave and resultant flux density wave.
 Stator mmf wave and resultant flux density.
  Rotor mmf wave and stator mmf wave.
 Stator mmf wave and resultant mmf wave.

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
Two DC generators having equal open-circuit emfs but slight different load characteristics are operating in parallel, then

 the machine with more drooping characteristic will supply more load.
None of these
  the machine with more drooping characteristic will supply less load.
  the machine will share load equally.

ANSWER DOWNLOAD EXAMIANS APP