Q4. A synchronous generator with a synchronous reactance of 1.5 p.u. is connected to an  infinite bus whose voltage is 1 p.u. The maximum permissible power output is 1.2 p.u. (a)  Compute the excitation voltage. (b) The power output is gradually reduced to 0.7 p.u. with fixed  field excitation. Find the new current and power angle δ.   Q5. Compute the reactive power generated by the machine of problem Q4 under part (b). If the  machine is required to generate a reactive power of 0.4 p.u. while supplying the same active  power by changing the field excitation, find the new excitation voltage and power angle δ.

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Q4. A synchronous generator with a synchronous reactance of 1.5 p.u. is connected to an 
infinite bus whose voltage is 1 p.u. The maximum permissible power output is 1.2 p.u. (a) 
Compute the excitation voltage. (b) The power output is gradually reduced to 0.7 p.u. with fixed 
field excitation. Find the new current and power angle δ.  
Q5. Compute the reactive power generated by the machine of problem Q4 under part (b). If the 
machine is required to generate a reactive power of 0.4 p.u. while supplying the same active 
power by changing the field excitation, find the new excitation voltage and power angle δ.  

answer Q5

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