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Electrical Machines

Electrical Machines
The current drawn by a 220 V DC series motor of armature resistance 0.5 Ω and back emf of 200 V is

 40 A.
 44 A.
 440 A.
 400 A.

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Electrical Machines
Quadrature axis synchronous reactance is the ratio of

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

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Electrical Machines
For very sensitive and wide speed control, the preferable control method is

 Armature control.
 Multiple voltage control.
 Ward-Leonard control.
 Field control.

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Electrical Machines
A 3- phase synchronous motor can operate over a wide range of power factors i.e. from lagging to leading power factor. This is achieved by

 varying the speed.
 changing the field excitation.
 changing the load.
 varying the applied voltage.

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Electrical Machines
A Shunt generator running at 1000 rpm has generated emf of 100 V. If the speed increases to 1200 rpm, the generated emf will be nearly

 175 V
 240 V
 120 V
 140 V

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Electrical Machines
A DC series motor is accidentally connected to single phase ac supply voltage. The torque produced will be

 pulsating and unidirectional
 steady and unidirectional
 oscillating
None of these

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