Electrical Machines Questions and Answers – DC Machines
Efficiency and Testing of DC Machines
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A dc motor is connected in the short-shunt configuration, but the series and the shunt windings get interchanged by mistake and the motor is connected to the rated voltage,
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If the field current and armature current are reversed, then
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In the hopkinson’s test on two DC machines. Machine A has field current of 1.4A and B has field current of 1.3A. Which machine acts as motor?
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Similarity between Hopkinonson’s and field’s test is that
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Retardation test on DC shunt motor is used for finding _______
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The possible assumption is/are made while doing swineburne’s test
(i) mechanical loss constant
(ii) Armature reaction neglected
(iii) Increases in flux
(i) mechanical loss constant
(ii) Armature reaction neglected
(iii) Increases in flux
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______ test is used for determining the efficiency of a traction motor
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The efficiency in the swineburne’s test can be found.
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Mark the possible causes of overheating of commutator in a DC machine
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In the Hopkinson’s test on two DC machines. Machine A has field current of 1.4A and B has field current of 1.3A. Which machine acts as generator?
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Swineburne’s test is applicable to those machines in which flux is practically _____
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The most appropriate relation to find efficiency of the generator
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The quantities needed to complete retardation test are/is
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The main concern before doing hopkinson’s test for finding efficiency is
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Hopkinson’s test is also called regenerative test due to
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Efficiency and Testing of DC Machines
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