Electrical Engg (EEE) - MCQ Practice Questions

In a transformer, the hysteresis loss depends on which of the following factors?

A 3-phase induction motor has 4 poles and operates at 50 Hz. What is the synchronous speed?

What is the typical slip value for a squirrel-cage induction motor operating at full load?

In a synchronous generator, the voltage regulation is negative when:

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:

For a 3-phase synchronous motor connected to infinite bus, increasing field excitation beyond the critical value will:

The cogging torque in a DC motor is primarily due to:

A 3-phase induction motor develops maximum torque at a slip of 0.4. The motor is operating at slip 0.1. What is the ratio of starting torque to running torque?

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:

A transformer has primary turns = 1000, secondary turns = 100. If primary current is 2 A, what is the secondary current (neglecting losses)?

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?

A synchronous generator operating at leading power factor supplies current to an infinite bus. This condition represents:

The crawling phenomenon in induction motors occurs due to:

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?