Electrical Engg (EEE) - MCQ Practice Questions

A series DC motor is suitable for which of the following applications?

The open-circuit test on a transformer primarily helps to determine:

In a permanent magnet synchronous motor (PMSM), the torque is primarily developed due to:

In a wound-rotor induction motor, adding external resistance to the rotor circuit:

The commutation in a DC machine is said to be 'overcommutated' when:

In an induction motor, the torque under running conditions is proportional to:

Which of the following represents the condition for maximum power transfer in a DC generator connected to external load?

In a 3-phase transformer with Y-Δ connection, the secondary voltage lags the primary by:

For a DC shunt motor operating at rated conditions, if the load is suddenly increased, the motor will:

A DC series motor is used in electric trains. If the load torque decreases suddenly, what happens to the motor speed?

In a 3-phase squirrel cage induction motor, which parameter can be increased to improve the starting torque?

The slot leakage reactance in an induction motor depends on:

In a DC generator, armature reaction causes:

The power factor of a transformer at no-load is low because:

Which of the following losses in an induction motor is proportional to slip?

In a separately excited DC motor, if flux is reduced to half while keeping the supply voltage constant, the armature current will:

The regulation of a DC shunt generator is poor because:

In a 3-phase synchronous generator, the pitch factor (or coil span factor) accounts for:

In a transformer connected to a load with lagging power factor, the secondary current will:

A 3-phase squirrel cage induction motor is running at 960 rpm when connected to a 50 Hz supply. If the supply frequency is suddenly changed to 60 Hz, what will be the approximate new speed of the motor, assuming the slip remains constant?