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Electrical Machines

Electrical Machines
In DC motors, under trailing pole tips, flux density will_______ ?

 decrease
 either increase or decrease
None of these
 increase

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Electrical Machines
Resistance commutation is used generally in case of

 DC machines above 10 kW.
  fractional kW DC machines.
 DC machines bellow 5 kW.
None of these

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Electrical Machines
For 250 volt DC Shunt Motor the armature and field resistance are 0.5 ohm and 250 ohm respectively. What will be the back e.m.f. produced when it takes a load current of 21A.

 240 V.
 280 V.
 220 V.
 150 V.

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Electrical Machines
When a synchronous motor is running at synchronous speed, the damper winding produces

 no torque.
 both 1 and 2.
 eddy current torque.
 damping torqe.

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Electrical Machines
Quadrature axis synchronous reactance is the ratio of

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

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Electrical Machines
Which of the following statement is true for an AC synchronous motor?

 It is a step angled motor.
 It is a high reluctance motor.
  It is a constant speed motor.
 It is a variable speed motor.

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