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Electrical Machines

Electrical Machines
Slot wedges in a dc machine is made up of

 mild steel.
 cast iron.
 silicon steel.
 fibre.

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Electrical Machines
Reluctance and hysteresis motors are the types of which electrical motor?

 3 - Φ induction motor.
 Stepper motor.
  1 - Φ synchronous motor.
 DC motor.

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Electrical Machines
Slip test is performed to determine

 slip
 positive sequence reactance and negative sequence reactance
All of these
 direct axis reactance and quadrature axis reactance

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Electrical Machines
which of the following losses are negligible in blocked rotor test?

 iron loss
 both A and B
 copper loss
 mechanical loss

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Electrical Machines
A 240 V, dc shunt motor draws 15 A while supplying the rated load at a speed of 80 rad/s. The armature resistance is 0.5 W and the field winding resistance is 80 W. The external resistance to be added in the armature circuit to limit the armature current to 125% of its rated value is

 15.9 Ω
 31.1 Ω
 15.1 Ω
 31.9 Ω

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Electrical Machines
A DC generator beyond critical resistance will generate

 maximum current.
 no voltage.
 maximum power.
 maximum voltage.

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