Analog Electronics
The per unit impedance of a synchorous machine is 0.242. If base voltage is increased by 1.1 times, then per unit value will be

 0.242.
 0.266.
  0.200.
 0.220.

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Analog Electronics
The typical input stage of an opamp has a

  differential input and single - ended output.
  differential input and differential output.
  single - ended input and single-ended output.
  single - ended input and differential output.

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