Unit 2

Which of the following is the primary function of a generator?

• Converts electrical energy to mechanical energy

• Converts mechanical energy to electrical energy

• Produces torque to rotate a shaft

• Reduces voltage in the circuit

Which of the following is the primary function of a motor?

• Converts electrical energy to mechanical energy

• Converts mechanical energy to electrical energy

• Generates high voltage

• Stores electrical energy

Which of the following is a part of the construction of a DC motor?

• Field, armature, and commutator

• Rotor and stator only

• Transformer core and winding

• Inductor and capacitor

What is the working principle of a DC motor?

• A current-carrying conductor experiences a force when placed in a magnetic field.

• A voltage is induced in a conductor when it moves through a magnetic field.

• A current generates a magnetic field around a conductor.

• The current is directly proportional to the applied voltage.

Which of the following is a type of DC motor?

• Synchronous motor

• Induction motor

• Shunt, series, and compound motors

• Universal motor

The working principle of an induction motor is based on:

• Faraday's law of electromagnetic induction

• Lenz's law

• Fleming’s left-hand rule

• Newton’s law of motion

In a transformer, the primary coil is connected to:

• The output load

• A constant DC supply

• An alternating current (AC) supply

• The ground

The efficiency of a transformer is given by the ratio of:

• Power loss to the output power

• Output power to the input power

• Input power to the output power

• Core losses to copper losses