Electrical Engg (EEE) - MCQ Practice Questions

In transient stability studies, which machine variable is most critical for assessing first-swing stability?

Which FACTS device provides independent control of both voltage magnitude and phase angle?

What is the critical clearing angle in transient stability analysis?

What is the primary mechanism of voltage instability in power systems?

Which formula represents the swing equation for a synchronous machine during a disturbance?

As per IEEE 1588-2019 standard, what is the typical accuracy of a Phasor Measurement Unit (PMU) for frequency measurement in power systems?

A 132 kV transmission line has a shunt capacitance of 0.008 µF/km and length of 200 km. Calculate the total reactive power generated by the line capacitance at steady state (assuming 132 kV operating voltage).

In the context of transient stability, a generator loses synchronism when:

Which of the following correctly represents the relationship between the steady-state stability limit and transient stability limit?

In a power system experiencing voltage instability, the reactive power support margin becomes critical. At what reactive power reserve margin should emergency measures be initiated according to Indian Grid Code?

The torque developed in a 3-phase induction motor is maximum at a slip of:

An 8-pole induction motor running at 720 rpm with 50 Hz supply has a slip of approximately:

In a DC machine, armature reaction causes:

The equivalent circuit of an induction motor includes a series resistance R2/s in the rotor branch. The power dissipated in this resistance represents:

In a synchronous motor, the pull-out torque depends on:

A transformer is operating at 110% of rated voltage. The core loss will be approximately:

The efficiency of a DC generator is maximum when:

A 100 kW, 3-phase induction motor has a full-load slip of 0.04. The rotor copper loss at full load is:

The reluctance torque in a synchronous motor is maximum when the load angle is:

Which statement is correct regarding the torque-slip characteristic of a squirrel-cage induction motor?