Electrical Machines
Consider the following statements regarding dc machines : 1. possible resistance of shunt-field winding is 1 Ω 2. possible resistance of series-field winding is 1 Ω 3. electrographite brushes are used for 230 V, 10 A machines 4. Copper-graphite brushes are used for 230 V, 10 A machines 5. Possible armature-circuit resistance is 1 Ω From these, the correct statements are

 1, 4
 2, 4 ,5
 1, 3, 5
 2, 3 , 5

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
Slip speed is the

  difference of actual rotor speed and synchronous speed.
  half of the sum of synchronous and rotor speeds.
  difference of synchronous speed and actual rotor speed.
  sum of synchronous and rotor speeds.

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
Which is the arrangement of windings in a core type single phase transformer?

 Sandwiched lv and hv discs on each core limb
 Half hv inside and half lv outside on each core limb
 Half lv inside and half hv outside on each core limb
 Lv on one core limb and hv on the other

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
The factors that are responsible for decrease in terminal voltage of a shunt generator are

  armature resistance, effect of armature reaction.
 armature resistance, effect of armature reaction.
 armature resistance, inter poles, armature.
  reduction in field current, effect of armature reaction, armature.

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
A compound dc generator is delivering full load current at a terminal voltage of 230 V. Its series-field winding gets short circuited. If its terminal voltage 1. becomes more than 230 V, it is overcompounded generator 2. becomes more than 230 V, it is differentially compounded generator 3. becomes less than 230 V, it is overcompounded generator 4. becomes less than 230 V, it is differentially compounded generator 5. becomes less than 230 V, it is level compounded generator From these, the correct answer is

 2,3
 1, 4, 5
 2, 3, 5
 1, 4

ANSWER DOWNLOAD EXAMIANS APP
MORE MCQ ON Electrical Machines