Electrical Engg (EEE) - MCQ Practice Questions

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?

In a 3-phase transformer with Delta-Star connection, the secondary voltage phase angle leads the primary by:

What is the relationship between electrical and mechanical power in a DC motor running at steady state?

In a synchronous motor, the angle between stator MMF and rotor MMF at full load is:

In a DC generator, armature reaction causes the neutral plane to:

A 3-phase induction motor draws 50 A at 0.7 lagging power factor when running at full load. What is the reactive power?

The primary advantage of a brushless DC motor (BLDC) over conventional DC motor is:

In a transformer under short-circuit test, the secondary is short-circuited and primary voltage is reduced to make rated current flow. The measured power is the:

Which of the following statements about a DC shunt motor is true?

The efficiency of a squirrel-cage induction motor improves with increasing load mainly because:

A DC motor is running at 1500 rpm with an armature current of 20 A. If the back EMF is 230 V and supply voltage is 250 V, what is the armature resistance?