Electrical Machines
In which of the following generators negative voltage regulation can occur?

 series generators
 shunt generator
 over compound generator
 both B and C

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Electrical Machines
Consider the following statements regarding dc machines : 1. possible resistance of shunt-field winding is 1 Ω 2. possible resistance of series-field winding is 1 Ω 3. electrographite brushes are used for 230 V, 10 A machines 4. Copper-graphite brushes are used for 230 V, 10 A machines 5. Possible armature-circuit resistance is 1 Ω From these, the correct statements are

 1, 4
 2, 3 , 5
 1, 3, 5
 2, 4 ,5

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Electrical Machines
In a synchronous generator with constant steam input supplies power to an infinite bus at a lagging power factor. If the excitation is increased

 both power angle and power factor increase
 both power angle and power factor decrease
 power angle increase and power factor decrease
 power angle decrease and power factor increase

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