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Solution of A DC Serial Motor Question (Quiz #3 / 2016-2017)
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20230524-EM2-EN - Live recording
2016-2017 Spring Term Quiz #3 Solution
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A 10 HP, 250V, 750 rpm DC Serial motor have an efficiency of 85% at full load. Voltage drop on armature resistance and voltage drop on serial excitation windings are 4.52% and 2% of applied rated voltage, respectively. (1 HP=746W. Mechanical losses are neglected. Machine magnetic circuit will be assumed linear without saturation)
Motor is operated at rated power in “a-e”
10p a) Draw connection diagram. Show terminal labels. 01:23
10p b) Find input power in kW. 06:00
20p c) Find load current. 07:35
20p d) Find Ra and Rsf. 09:00
20p e) Find torque on shaft. 12:25
20p f) Calculate terminal voltage for half speed (Load torque is constant at given above conditions). 14:25
2016-2017 Spring Term Quiz #3 Solution
---------
A 10 HP, 250V, 750 rpm DC Serial motor have an efficiency of 85% at full load. Voltage drop on armature resistance and voltage drop on serial excitation windings are 4.52% and 2% of applied rated voltage, respectively. (1 HP=746W. Mechanical losses are neglected. Machine magnetic circuit will be assumed linear without saturation)
Motor is operated at rated power in “a-e”
10p a) Draw connection diagram. Show terminal labels. 01:23
10p b) Find input power in kW. 06:00
20p c) Find load current. 07:35
20p d) Find Ra and Rsf. 09:00
20p e) Find torque on shaft. 12:25
20p f) Calculate terminal voltage for half speed (Load torque is constant at given above conditions). 14:25
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