Electrical Engg (EEE) - MCQ Practice Questions

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

The rotating magnetic field in a 3-phase induction motor rotates at:

A synchronous motor is running at no-load with normal excitation. If excitation is increased, the armature current will:

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 an autotransformer, if primary turns = 100 and secondary turns = 400, the voltage transformation ratio is:

A 3-phase induction motor has 4 poles and operates from a 50 Hz supply. The synchronous speed is:

The phenomenon of cogging in induction motors occurs due to:

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

The double-field revolving theory is used to analyze:

In a transformer, the no-load current lags the applied voltage by approximately:

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:

A shaded pole induction motor uses ________ for starting torque generation.

If the frequency of supply to an induction motor is reduced while maintaining the same voltage, the motor torque will:

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?

In a DC series motor, the back EMF at rated load is 200V when the supply voltage is 230V. If the motor is suddenly unloaded, which of the following will occur?