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Electrical Machines

Electrical Machines
Open circuit test on transformer gives

 eddy current loss
 both 1and 2
 hysteresis loss
 copper loss

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

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

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Electrical Machines
If a DC Series motor is connected across an AC supply it will

 run at lower speed.
 run at normal speed.
 burn.
 not run.

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Electrical Machines
A 3 - Φ, 6 pole, 50 Hz IM has a rotor speed of 987 rpm find rotor frequency?

 0.75 Hz.
  0.65 Hz.
  60 Hz.
 0.70 Hz.

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Electrical Machines
For a DC Shunt Motor having armature resistance of 0.5 Ω and 2A armature current at no-load, when the armature current is changed to 20A at loaded condition the speed is 1000 r.p.m. What is the speed at no-load?

 4575.4 r.p.m.
 963.8 r.p.m.
 1037.5 r.p.m.
 1130 r.p.m.

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Electrical Machines
If the field circuit of a DC shunt motor is opened

 DC Shunt Motor
 The speed of motor will be reduced.
 The armature current will reduce.
  The motor will attain dangerously high speed.

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