Refer to the simplified schematic of the...

Question 1 / 2066636eed28f7522a1c51d97d

Question 1 of 2066636eed28f7522a1c51d97d

Refer to the simplified schematic of the Ward-Leonard drive system shown in the illustration. The DC winch exhibits normal speed control from minimum to base speed, but the speed cannot be elevated above base speed. What condition would account for this? Illustration EL-0153

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🔍 Key Concepts

• Ward-Leonard speed control: armature voltage control from minimum to base speed, then motor field weakening for speeds above base speed • How generator field and motor field circuits each affect the DC motor’s armature voltage and speed • What happens to speed if the field cannot be weakened versus if the field or supply is completely open or dead

💭 Think About

• From the graph, what changes between minimum and base speed, and what changes between base speed and maximum speed? Which control (armature or field) is responsible for each region? • If the system works perfectly up to base speed, which part of the Ward-Leonard system must already be functioning correctly? Which fault options would prevent it from ever reaching normal base speed? • For each answer choice, ask: would this fault (a) let the motor run normally up to base speed, but (b) block any further speed increase above base speed without completely stopping the system?

✅ Before You Answer

• Identify which component is used for armature voltage control (region labeled ‘Armature Control’ in the graph) and which is used for field control (region labeled ‘Field Control’). • For each choice, verify whether the fault would still allow rated armature voltage and normal base-speed operation. • Focus on the option that would hold the motor field at maximum strength so the field current cannot decrease as shown by the ‘Decreasing Field Current’ curve.

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Question 1 of 20

A short-circuited DC motor field control rheostat.

An open-circuited DC generator field winding.

An open-circuited DC winch motor field winding.

A failure of the DC static power supply to produce a voltage.

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Question 1 / 2066636eed28f7522a1c51d97d

Question 1 of 2066636eed28f7522a1c51d97d

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Question 1 of 20

66636eed28f7522a1c51d97d

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🔍 Key Concepts

💭 Think About

✅ Before You Answer

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