Electrical Engg (EEE) - MCQ Practice Questions

A DC shunt motor is running at no load. If the field winding is suddenly short-circuited, the motor will:

The efficiency of a transformer is maximum when:

The starting current of a 3-phase induction motor is typically how many times the full-load current?

Which method is NOT used for starting a three-phase induction motor?

A DC series motor is suitable for:

The power factor of an induction motor at full load is typically:

What is the relationship between slip and rotor frequency in an induction motor?

In a synchronous motor, the damper winding is used to:

A 100 kVA transformer has 1000 primary turns and 100 secondary turns. The turns ratio and voltage ratio are:

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.

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:

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

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

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

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

Which type of DC motor provides excellent speed control characteristics and is suitable for cranes and hoists?