High starting torque
Low starting torque
motors can find applications requiring A. High starting torque B. Low starting torque C. Variable speed
Frequent on-off cycles
Answer is Wrong!
Answer is Right!
The correct answer is: A. High starting torque.
Differentially compound D.C. motors have a series field winding and a shunt field winding. The series field winding is connected in series with the
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armature, while the shunt field winding is connected in parallel with the armature. The series field winding has a higher resistance than the shunt field winding, so it produces a stronger magnetic field when current flows through it. This stronger magnetic field produces a higher starting torque.
Low starting torque is required for applications where the motor is started from a standstill and needs to accelerate quickly. Variable speed is required for applications where the motor needs to operate at different speeds. Frequent on-off cycles are required for applications where the motor is turned on and off frequently.
Here are some additional details about each option:
- High starting torque: Differentially compound D.C. motors have a high starting torque, which makes them suitable for applications where the motor needs to start from a standstill and accelerate quickly. For example, they are often used in cranes, hoists, and elevators.
- Low starting torque: Low starting torque is required for applications where the motor is started from a standstill and needs to accelerate slowly. For example, they are often used in conveyor belts and fans.
- Variable speed: Variable speed is required for applications where the motor needs to operate at different speeds. For example, they are often used in machine tools and textile machines.
- Frequent on-off cycles: Frequent on-off cycles are required for applications where the motor is turned on and off frequently. For example, they are often used in power tools and appliances.