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Electrical Machines

Electrical Machines
DC shunt motors are suitable for

 Centrifugal pumps
 Blowers and fans.
 Lathes.
  All of this.

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Electrical Machines
Considering a galvanometer is connected to the rotor of a 3 - Φ, 4 pole, 50 Hz IM and is making 130 oscillations in a minute, then calculate the rotor speed?

 1500.
  1435.
 1440.
 1450.

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Electrical Machines
For a DC machine having P no of pair of pole pairs, Z no of conductors having length L of resistivity ρ and cross section S are arranged. what is the armature resistance?

 PZL/4Sp²
 PZL/4S
 PZL/ 4Sa
 PZL/4Sa²

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Electrical Machines
A 4 pole 50 Hz induction motor is running at 1470 rpm. What is the slip value?

 0.04
 0.2
 0.4
 0.02

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Electrical Machines
For a practical synchronous motor the pull out torque will occur when the torque angle is nearly equal to

 30°.
  75°.
 45°.
 0°.

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Electrical Machines
In DC machines internal characteristics are plotted between

 Eg vs load current
 Vt vs load current
 Vt vs Ia
 Eg vs Ia

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