Electrical Machines Questions and Answers – Efficiency and Regulation
Power Flow Through an Inductive Impedance – I
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For a 3 phase synchronous generator of terminal voltage as 1 pu and field excitation of 1.5 pu. If the resistive drop is 0.2 pv, then what can be concluded for power factor?
Correct!
Wrong!

For an alternator, the specified load angle should be _________ for an impedance angle of ‘θ’.
Correct!
Wrong!

For a three phase synchronous motor, if the following condition is satisfied, it can be said that it is operating at
Vt > EfIa*ra
Vt > EfIa*ra
Correct!
Wrong!

for a 3 phase 315V alternator having impedance angle of 60 degree, the required load angle for the maximum power input to the generator is _______
Correct!
Wrong!

For a 3 phase synchronous generator of terminal voltage as 1 pu and field excitation of 1.2 pu. If the resistive drop is 0.2 pv, then what can be concluded for power factor?
Correct!
Wrong!

For a 3 phase synchronous motor, the load angle should be equal to impedance angle.
Correct!
Wrong!

Reactive power is a matter of interest at
Correct!
Wrong!

For a three phase synchronous motor, if the following condition is satisfied, it can be said that it is operating at
Vt = EfIa*ra
Vt = EfIa*ra
Correct!
Wrong!

With constant E,V,Z, the maximum input power can be obtained at load angle of value _______
Correct!
Wrong!

The reactive power flow is outward from an alternator, then it is
Correct!
Wrong!

1. Which is the correct relation below?
Correct!
Wrong!

For a 3 phase synchronous generator of terminal voltage as 1 pu and field excitation of 1 pu. If the resistive drop is 0.2 pv, then what can be concluded for power factor?
Correct!
Wrong!

For a three phase synchronous motor, if the following condition is satisfied, it can be said that it is operating at
Vt < EfIa*ra
Vt < EfIa*ra
Correct!
Wrong!

The condition for maximum power output for an alternator having its load impedance as (2+j) ohms is
Correct!
Wrong!

The reactive power flow is outward from an alternator, then the alternator works at
Correct!
Wrong!
