Electrical Machines
A shunt generator has a critical field resistance of 300 Ω at a speed of 800 rpm if the speed is raised to 1000 rpm the critical field resistance is

 225 Ω.
 145 Ω.
  375 Ω.
 150 Ω.

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Electrical Machines
In synchronous generator, inverted V curve is drawn between

 field current on X-axis and power factor on Y-axis
 field current on Y-axis and power factor on X-axis
 field current on Y-axis and armature current on X-axis
 field current on X-axis and armature current on Y-axis

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