Electrical Engg (EEE) - MCQ Practice Questions

In a 400 kV transmission line, if the sending end voltage is 400 kV and receiving end voltage drops to 380 kV, what is the percentage voltage regulation?

A synchronous generator has a subtransient reactance (X''d) of 0.15 pu and transient reactance (X'd) of 0.25 pu. During a three-phase fault, which reactance is used for the initial fault current calculation?

Which protection scheme is mandated for inter-state transmission lines in India according to Grid Code 2023?

A capacitor bank rated 50 MVAR at 400 kV is to be switched in a power system. Which device is most suitable for controlled switching to avoid transient overvoltages?

In the Indian power system, the frequency regulation bandwidth for Load Frequency Control (LFC) is typically maintained within:

A 50 MW, 11 kV, 50 Hz synchronous generator has an inertia constant H = 6 seconds. Calculate the kinetic energy stored in the rotor at rated speed.

In a multi-machine power system stability study, which parameter is used to measure relative rotor angle instability between two generators?

A STATCOM (Static Synchronous Compensator) is installed in a 220 kV network. In what mode should it operate to provide reactive power support during a voltage sag?

In selective coordination of protective devices, what is the minimum time interval required between the operation of primary and backup fuses as per Indian standards?

A transmission line is protected by a distance relay set with Zone 2 reach at 80% of line length. If the line is 150 km and has impedance of 0.4 Ω/km, what is the Zone 2 reach impedance?

A DC shunt motor is running at no load. If the field winding is suddenly short-circuited, the motor will:

The efficiency of a transformer is maximum when:

The starting current of a 3-phase induction motor is typically how many times the full-load current?

Which method is NOT used for starting a three-phase induction motor?

A DC series motor is suitable for:

The power factor of an induction motor at full load is typically:

What is the relationship between slip and rotor frequency in an induction motor?

In a synchronous motor, the damper winding is used to:

A 100 kVA transformer has 1000 primary turns and 100 secondary turns. The turns ratio and voltage ratio are:

A DC shunt motor shows increased speed. What could be the reason?