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Electrical Machines

Electrical Machines
The slot edges in a DC machine are made of

 Cast iron.
 Silicon steel.
  Fibre.
 Mild steel.

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Electrical Machines
Consider a separately excited DC motor. If the field current is increased while the armature terminal voltage is held constant, then speed of the motor

 Increase.
  Decrease.
 Remains same.
 None of these.

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Electrical Machines
A single phase transformer has specifications as 250 KVA, 11000 V/415 V, 50 Hz. What are the values of primary and secondary currents?

 primary = 22.7 A, secondary = 602.4 A
 primary = 301 A, secondary = 22.7 A
 primary = 602 A, secondary = 22.7 A
 primary = 11.4 A, secondary = 301 A

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Electrical Machines
A 3 - Φ, 400 / 200 V, Y - Y connected wound rotor induction motor has 0.06 Ω rotor resistance and 0.3 Ω standstill reactance per phase. To make the starting torque equal to maximum torque of the motor the additional resistance required

 0.45 Ω.
 0.78 Ω.
 0.66 Ω.
  0.24 Ω.

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Electrical Machines
A 4 pole DC shunt generator having a wave winding supplies 50 lamps, each of 60 W at 120 V. The armature and field resistance are 0.2 Ω and 60 Ω respectively. The current in each armature conductor is

  13.5 A.
 11.5 A.
 27 A.
 23 A.

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Electrical Machines
On which of the following factor/factors the speed of a DC motor depends upon?

 All of these.
 Armature current.
 Applied voltage.
 Field flux.

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MORE MCQ ON Electrical Machines

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