GETCO Exam Paper (22-07-2015)
Two watt meter method for 3 phase circuit is preferred over other methods because

it can be used for balanced or unbalanced load
all are correct
it can be used for star or delta connected load
PF of the load can also be estimated

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GETCO Exam Paper (22-07-2015)
Laplace transforms is used for

converting diffential equation to algebraic equation
finding transfer function of any systems
for finding initial condition in a system
converting non linear equation to linear equation

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