Electrical Engg (EEE) - MCQ Practice Questions

Which of the following is the primary function of a commutator in a DC machine?

The back EMF in a DC motor is given by the expression?

In a three-phase induction motor, the rotating magnetic field is produced by:

The synchronous speed of a 4-pole, 50 Hz induction motor is:

The slip of an induction motor is defined as:

In a transformer, the turns ratio k = N2/N1. If k > 1, the transformer is:

A 3-phase induction motor has 4 poles and is connected to a 50 Hz supply. What is the synchronous speed?

Which of the following is NOT a type of DC machine?

In a transformer, the core loss is independent of which parameter?

In a DC generator, the commutator serves the purpose of:

Which of the following losses in a transformer occurs in both primary and secondary windings?

In a DC motor, the back EMF is proportional to which of the following?

What is the synchronous speed of a 6-pole, 3-phase induction motor operating at 50 Hz frequency?

The slip of an induction motor at rated load is typically in the range of:

The copper loss in a transformer is minimum when:

An induction motor is running at a slip of 4%. If the synchronous speed is 1500 RPM, the actual rotor speed is:

The no-load core loss in a transformer is primarily due to:

A 8-pole, 3-phase induction motor is required to run at approximately 720 RPM at 50 Hz. The approximate slip required is:

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?