3.12 DC Generator Av

What factor primarily determines the strength of the voltage induced in the conductor of a generator?

• The length of the conductor
• The speed of the conductor's movement within the magnetic field
• The thickness of the conductor

How does armature reaction change with increasing generator load?

• Armature reaction decreases
• Armature reaction remains constant
• Armature reaction increases

What is the role of the rotating armature in a DC generator?

• To produce magnetic flux
• To generate electrical energy by rotating within a magnetic field
• To maintain constant voltage output

What is the primary reason series-wound generators have poor voltage regulation?

• They have no connection to the external circuit
• The field winding is connected in series with the external circuit
• The field winding is connected in parallel with the external circuit

What is the importance of inspecting the condition of generator brushes during maintenance?

• To ensure they are making proper contact with the commutator and to check for excessive wear or sparking
• To verify the generator's rotational speed
• To adjust the generator's output voltage

When a coil with current flowing through it is placed in a magnetic field, what happens to the coil if current flows inward on one side and outward on the other?

• The coil will not rotate and remain stationary.
• The coil will rotate until its plane is parallel to the magnetic lines.
• The coil will rotate until its plane is perpendicular to the magnetic lines.

How does the torque on the coil change when the coil rotates from Position A to Position B, where the coil is at a 90° angle to the original position?

• Torque increases continuously.
• Torque reaches a maximum at Position A and a minimum at Position B.
• Torque remains constant throughout the rotation.

How is the field winding of a shunt motor connected?

• In series with the armature winding.
• In parallel with the armature winding.
• In series with the power supply.

What type of motor operation is characterized by the need for cooling periods after short runs?

• Continuous duty motor.
• Intermittent duty motor.
• Both continuous and intermittent duty motors.

How does the rheostat control motor speed in a shunt motor?

• By varying the current in the armature windings.
• By increasing or decreasing resistance, which changes the field current and, thus, the motor speed.
• By altering the voltage applied to the armature.