Electrical Machines
When a short circuit test on a transformer is performed at 25 V, 50 Hz, the drawn current is I1. If the test is performed by 25 V and 25 Hz and power drawn current is I2, then

 I1 > I2
None of these
 I1 = I2
 I1 < I2

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Electrical Machines
In a DC machine

 emf in armature conductors and at the terminals is alternating.
 current and emf at the terminals are alternating.
 current and emf in armature are unidirectional
 current and emf in armature are alternating.

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