GATE EE 2019 Set 1 — Question 56
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Electrical Machines → DC Machines → Generator & Motor Characteristics
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Question
A 220 V DC shunt motor takes 3 A at no-load. It draws 25 A when running at full-load at 1500 rpm. The armature and shunt resistances are 0.5 and 220 , respectively. The no-load speed in rpm (round off to two decimal places) is _____.
Correct answer
1564 to 1596
Solution
Given a 220 V DC shunt motor with , no-load line current , full-load line current , full-load speed , and .Step 1: Shunt field currentStep 2: Armature currentsStep 3: Back emfsStep 4: Speed relation
The field current is the same in both cases, so the flux is constant and :Answer: rpm
The field current is the same in both cases, so the flux is constant and :Answer: rpm
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