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Electrical Machines

Electrical Machines
In DC machines shape of net flux density is?

 sine wave
 peaky in nature
 saddle shape
 flat tapped or trapezoidal

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Electrical Machines
The output voltage of a DC generator is

  E = V + IaRa.
 E = V + Ra.
 E = V – IaRa.
 E = V + Ia.

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Electrical Machines
A 3 phase stepper motor has 6 stator poles and 4 rotor poles, then find the step angle?

 60°
 10°
 30°
 45°

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Electrical Machines
A 220 V DC generator is run at full speed without any excitation. The open circuit voltage will be

  220 V.
  about 50 V.
  about 2 V.
  zero.

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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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Electrical Machines
Which of the following motor is expensive for same Kw output rates?

 DC Shunt Motor
 Induction motor.
 Synchronous motor.
 AC single phase motor.

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