Question 1 of 270705eccefa3bacbc34ba4d48070

As shown in figure "B" of the illustration, when the DC motor in figure "A" is accelerating from minimum speed to base speed what are the motor's operational characteristics? See illustration EL-0153.

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Question 1 of 27070
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Q

As shown in figure "B" of the illustration, when the DC motor in figure "A" is accelerating from minimum speed to base speed what are the motor's operational characteristics? See illustration EL-0153.

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🔍 Key Concepts

• Figure B labels the region from minimum speed to base speed as armature control with "increasing armature voltage". • Look carefully at the torque curve in this armature-control region – does it stay flat, rise, or fall as speed increases? • Remember that horsepower is related to torque and speed by: HP ∝ Torque × Speed.

💭 Think About

• From minimum to base speed, if the armature voltage is being raised while field current is held at its maximum, what normally happens to the torque of a DC motor? • If torque stays the same while speed increases, what must happen to horsepower? If torque changes while speed increases, how does that affect horsepower? • Compare the constant-torque and constant-power labels in the diagram: which one applies below base speed?

✅ Before You Answer

• Verify which part of the speed range in figure B is marked constant torque and which is marked constant power. • Check whether the rated power line is reached before, at, or after base speed in the illustration. • Use the relationship HP ∝ Torque × Speed to decide how horsepower behaves when speed increases in a constant-torque region.