Power Systems
In thermal power stations, economiser will

 reduce the thermal efficiency
 increase the thermal efficiency
 reduce the heat
 both 2 and 3

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Power Systems
Which of the following statements is/are true? The elements of each row of a Y bus matrix for load flow studies in power system add up to zero

 if the mutual couplings between transmission lines are absent
 always
 if the shunt admittances at the buses are ignored
 if both 2 and 3 are satisfied

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