Electric Machines Construction Overview

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What is the purpose of the commutator-brush combination in a DC machine?

To induce voltage in the armature winding
To fix armature current distribution in space (correct)
To reduce eddy currents in the laminations
To maximize flux density in the iron core

Which component of a DC machine is responsible for producing the primary flux?

Field winding (correct)
Rotor
Armature winding
Commutator

What is the main advantage of DC machines?

Low maintenance requirements
High efficiency in power generation
Ease of speed and torque regulation (correct)
Ability to operate in extreme temperatures

In which type of DC machine construction is a uniform air gap present between the stator and rotor?

Cylindrical machine (C) Signup and view all the answers

What is the primary limitation of the application of DC machines?

Restricted use to mills, mines, and trains (C) Signup and view all the answers

Which component of the DC machine serves to interconnect conductors to form windings?

Armature winding (C) Signup and view all the answers

What is the primary purpose of the field winding in a DC machine?

To produce the main magnetic field in the machine (D) Signup and view all the answers

Which of the following is a key difference between the rotor in a DC machine and the rotor in an AC induction machine?

The DC machine rotor has a winding, while the induction machine rotor has a squirrel-cage winding (C) Signup and view all the answers

What is the primary function of the motor housing or yoke in a DC machine?

To provide structural support for the machine (B) Signup and view all the answers

Which of the following is a key advantage of a DC machine over an AC induction machine?

DC machines can provide variable speed control more easily (C) Signup and view all the answers

What is the primary purpose of the commutator in a DC machine?

To switch the direction of current in the armature winding (B) Signup and view all the answers

Which of the following is a key factor that determines the output power of a DC machine?

The diameter and length of the armature winding (B) Signup and view all the answers

What is the primary function of the stator in a DC machine?

To produce the required magnetic field by DC excitation (C) Signup and view all the answers

Which part of a DC machine is responsible for the rotation and conversion of electrical energy into mechanical energy?

Rotor (D) Signup and view all the answers

What is the primary function of the field winding in a DC machine?

To produce the required magnetic field intensity (D) Signup and view all the answers

Which component of a DC machine serves as a protective housing for the internal parts?

Motor house/yoke (A) Signup and view all the answers

What is the function of the iron core in a DC machine?

To produce inductance for the electrical circuits or components (D) Signup and view all the answers

Which part of a DC machine is referred to as the 'armature'?

Rotor (B) Signup and view all the answers