5 Questions
What is the purpose of armature voltage control during the starting of a DC motor?
To limit the motor current to a safe value by applying voltage gradually
What happens if a DC motor is started with full supply voltage across its terminals?
A very high current will flow, which may damage the motor
Which method is used to limit the armature current to a safe value during starting by adding a variable resistance in series with the armature circuit?
Variable resistance control
How does adding resistance in series with the armature circuit affect the loading speed of a DC motor?
$R_s$ does not affect the no-load speed, but it affects the loading speed (speed drop)
What is the consequence of heavy sparking at the commutator during starting of a DC motor?
Damage to the commutator and winding
Test your knowledge on starting DC motors with full supply voltage and the potential issues related to heavy sparking at the commutator and heating of the winding.
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