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Electrical Machines

Electrical Machines
Direct axis reactance is defined as the ratio of

 Vmax to Imin
 Vmax to Imax
 Vmin to Imax
 Vmin to Imin

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Electrical Machines
A 4 pole 50 Hz induction motor is running at 1470 rpm. The frequency of rotor current is

 0 Hz
 50 Hz
 5 Hz
 1 Hz

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Electrical Machines
In a 2 pole lap winding dc machine , the resistance of one conductor is 2Ω and total number of conductors is 100. Find the total resistance

 10Ω
 50Ω
 200Ω
 100Ω

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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?

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

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Electrical Machines
An inverted V-curve of synchronous motor shows the variation of

 power factor and supply voltage during hunting
 supply voltage and field current at constant excitation
All of these
 power factor and dc excitation at constant load

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Electrical Machines
In a single phase induction motor, the starting torque developed is proportional to

 1/V²
 supply voltage V
 1/V
 V²

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MORE MCQ ON Electrical Machines

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