Electrical Engg (EEE) - MCQ Practice Questions

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

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

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

An induction motor operating at slip s = 0.04 has rotor frequency of 2 Hz. Find the supply frequency.

Which winding in a synchronous motor provides the initial torque for starting?

A 50 kVA, $\frac{2300}{230}$ V transformer has a primary resistance of 2Ω. Calculate the equivalent primary resistance referred to secondary side.

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

A 3-phase induction motor draws 50 A at 0.8 power factor lagging from 400 V supply. The input power is approximately:

The back EMF of a DC motor is given by:

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

A 4-pole, 3-phase induction motor operates at a slip of 0.05. The rotor speed is:

In a synchronous motor, the pull-out torque depends on:

A transformer is operating at 110% of rated voltage. The core loss will be approximately:

Which starting method is suitable for a 3-phase induction motor with locked rotor current limit?

The efficiency of a DC generator is maximum when:

A 100 kW, 3-phase induction motor has a full-load slip of 0.04. The rotor copper loss at full load is:

In a DC motor, the starting resistance is required because:

Which transformer connection is preferred for step-up operations in power generation?

The reluctance torque in a synchronous motor is maximum when the load angle is:

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