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

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Electrical Machines
Short circuit test is performed on a transformer with a certain impressed voltage at rated frequency. If the short circuit test is now performed with the same magnitude of impressed voltage, but at frequency higher than the rated frequency then

 The magnitude of circuit as well as the power factor will decrease.
 The magnetude of current will increase, but power factor will decrease.
 The magnitude will both increase.
 The magnitude of current will decrease but the power factor will increase.

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