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

 0.220.
 0.266.
 0.242.
  0.200.

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Analog Electronics
Pinch-off voltage in a JFET is

 the drain voltage that gives zero drain current.
 the gate to source voltage that gives zero drain current.
 the gate to source voltage that gives unity drain current.
 the drain voltage that gives infinite drain current.

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