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Electrical Engineering Objective Questions { DC Motors }

120. Retardation test in case of shunt motors and generators is used to determine
A. friction losses
B. eddy current loss
C. copper losses
D. stray losses

121. Which of the following tests on dc machines needs minimum of two machines?
A. retardation test
B. back-to-back test
C. Swinburne test
D. Brake's test

122. Hopkinson test on dc motor is conducted at
A. full load
B. half load
C. low load
D. no load

123. Which of the following tests can be conducted on other than shunt machines?
A. Swinburne test
B. field's test
C. retardation test
D. back-to-back test

124. in which of the following tests only one motor is required?
A. Hopkinson test
B. field's test
C. Brake test
D. all of these

125. Swinburne test can not be used for which of the following de machine
A. series motor
B. shunt motor
C. compound motor
D. none of these

126. In a dc motor iron losses occur in
A. the field
B. the armature
C. the yoke
D. none of these

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