Electrical Machines
A 220 V, DC shunt motor is operating at a speed of 1440 rpm. The armature resistance is 1.0 Ω and armature current is 10 A. of the excitation of the machine is reduced by 10%, the extra resistance to be put in the armature circuit to maintain the same speed and torque will be

 3.1 Ω
 1.79 Ω
 1.8 9 Ω
 2 .1 Ω

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
Two synchronous generators operating in parallel 200 MW and 400 MW respectively. The drooping characteristics of their governors are 4% and 5% from no load to full load. Consider the governors operating at 50Hz on no load. How will the machine share, if the load is 600 MW?

 generator 2 gets over load
 generator 1 gets over load
None of these
 200 MW and 400MW

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
In a 3 - Φ induction motor

  power factor at starting is high as compared to that while running.
  power factor at starting in the same as that while running.
  power factor at starting is low as compared to that while running.
  none of them.

ANSWER DOWNLOAD EXAMIANS APP
MORE MCQ ON Electrical Machines