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Electrical Machines

Electrical Machines
In which transformer, the tertiary winding is used?

 Delta - star
 Star - delta
 Star - star
 Delta - delta

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Electrical Machines
In DC machines internal characteristics are plotted between

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

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Electrical Machines
Which of the following induction motor has the highest starting torque?

 Same in both induction motors.
None of these
 Squirrel cage induction motor.
 Slip ring induction motor.

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Electrical Machines
An 8 pole DC generator has 500 armature conductors and useful flux per pole of 0.065 Wb. What will be the emf generated if it is lap connected and runs at 1000 rpm. What must be the speed at which it is driven to produce the same emf if it is wave wound?

 2166.67V, 230 rpm.
 541.67V, 200 rpm.
 2166.67V, 270 rpm.
 541.67V, 250 rpm.

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Electrical Machines
Which type of motors are preferred in lifts?

 DC series motors.
None of these
 DC shunt motors.
 DC compound motors.

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Electrical Machines
Swinburne test is conducted under which of the following condition?

 half load
 any of the above
 no load
 full load

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