Problem Solving in DC Machines Quiz

What are the two main types of DC machines?

• AC motor and AC generator

• DC motor and DC generator

• Transformer and Induction motor

• Brushless motor and Stepper motor

Name one principle of DC machines.

• Principle of nuclear fusion

• Principle of aerodynamics

• Principle of electromagnetic induction

• Principle of gravitational force

What are the components of a DC machine's construction?

• The components of a DC machine's construction include the wheels, gears, and pulleys.

• The components of a DC machine's construction include the fan, casing, and motor.

• The components of a DC machine's construction include the stator, rotor, commutator, brushes, and shaft.

• The components of a DC machine's construction include the battery, wires, and switches.

How does a DC machine convert electrical energy into mechanical energy?

• By converting light energy into mechanical energy

• By the interaction of magnetic fields and conductors

• By converting heat energy into mechanical energy

• By using chemical reactions to produce mechanical energy

Name another type of DC machine apart from the ones mentioned earlier.

• Induction motor

• AC motor

• Brushless DC motor

• DC shunt motor

What is the principle of commutation in DC machines?

• Decreasing the resistance in the armature conductors

• Stopping the flow of current in the armature conductors

• Reversing the current in the armature conductors

• Increasing the voltage in the armature conductors

What materials are commonly used in the construction of DC machines?

• Copper, iron, and steel

• Wood, rubber, and paper

• Gold, silver, and platinum

• Aluminum, plastic, and glass

Explain the working principle of a DC motor.

• The working principle of a DC motor is based on the flow of alternating current through the coils.

• DC motors operate by converting electrical energy into thermal energy.

• The interaction between a magnetic field and a current-carrying conductor generates a mechanical force.

• The speed of a DC motor is determined by the amount of resistance in the circuit.

What is the role of the armature in a DC machine?

• Provides lubrication to the moving parts

• Regulates the speed of the machine

• Produces the magnetic field and generates electrical output

• Controls the temperature of the machine

Describe the process of armature reaction in a DC generator.

• Armature reaction is the process of converting electrical energy into mechanical energy in a DC generator.

• Armature reaction is the process of controlling the speed of the DC generator.

• Armature reaction in a DC generator is the effect of the magnetic field produced by the armature current on the main magnetic field of the generator.

• Armature reaction is the process of converting mechanical energy into electrical energy in a DC generator.