DC Motors MCQs Quiz Multiple Choice Questions & Answers Page 3

DC Motors MCQs questions answers


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DC Motors Questions with Answers

101. In case of D.C. shunt motors the speed is dependent on back e.m.f. only because

102. In case the back e.m.f. and the speed of a D.C. motor are doubled, the torque developed by the motor will

103. In case-the conditions for maximum power for a D.C. motor are established, the efficiency of the motor will be

104. In D.C. machines fractional pitch winding is used

105. In D.C. machines the residual magnetism is of the order of

106. In D.C. motor which of the following can sustain the maximum temperature rise?

107. In D.C. shunt motors as load is reduced

108. In the D.C. motor the iron losses occur in

109. In variable speed motor

110. In Ward-Leonard control the lower limit of speed is imposed by

111. In which of the following applications D.C. series motor is invariably tried?

112. No-load speed of which of the following motor will be highest ?

113. One D.C. motor drives another D.C. motor. The second D.C. motor when excited and driven

114. Regenerative method of braking is based on that

115. Sparking at the commutator of a D.C. motor may result in

116. Sparking, is discouraged in a D.C. motor because

117. Speed control by Ward Leonard method gives uniform speed variation

118. Starters are used with D.C. motors because

119. The armature torque of the D.C. shunt motor is proportional to

120. The armature voltage control of D.C. motor provides

121. The armature voltage control of D.C. motor provides

122. The condition for maximum efficiency for a D.C. generator is

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