Refer to the simplified schematic of the...

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Question 1 of 2066636eed28f7522a1c51d97f

Refer to the simplified schematic of the Ward-Leonard drive system shown in the illustration. What statement is true concerning the acceleration of the DC winch motor from minimum to base speed at constant torque? Illustration EL-0153

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Question 1 of 20

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🔍 Key Concepts

• Ward-Leonard drive basic idea: the DC motor speed is controlled by varying the DC generator output (armature voltage) and/or field currents. • Constant torque region (minimum to base speed): look at the shaded "Armature Control" area and the note about increasing armature voltage. • Relationship in a DC motor: speed ∝ armature voltage / field flux, while torque ∝ armature current × field flux.

💭 Think About

• From minimum to base speed at constant torque, which quantity must stay essentially constant: motor field, generator field, or armature current? • In that same speed range, what is being changed according to the graph: generator armature RPM or generator field current, and how does that affect armature voltage? • Which option describes a situation where you can raise the motor speed without weakening the field, but instead by changing the generator output voltage?

✅ Before You Answer

• Identify on the lower graph where Armature Control (not Field Control) is used and note what happens to armature voltage from minimum to base speed. • Confirm that in the constant torque region, the field current is held at maximum and only the armature voltage is varied. • Eliminate any choices that describe field weakening (decreasing field current) or operation beyond base speed, since the question is only about minimum to base speed at constant torque.

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