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Electrical Engineering Objective Questions { Utilisation of Electrical Energy }

106. Wound rotor and squirrel-cage motors with high slip which develop maximum torque at stand still are used for
A. presses and punches
B. machine tools
C. elevators
D. all of these
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107. Belted slip ring induction motor is almost invariably used for
A. centrifugal blowers
B. water pumps
C. jaw crushers
D. heavy load
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108. In jaw crushers, generally a motor has to start against
A. low load
B. medium load
C. normal load
D. heavy load
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109. Motor preferred l for synthetic fibre mills is
A. D.C. Series motor
B. reluctance motor
C. D.C. Shunt motor
D. synchronous motor
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110. Power factor in case of reluctance motor is
A. nearly unity
B. always leading
C. 0.8 lagging
D. 0.3 to 0.4 leading
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111. A reluctance motor on over load runs as
A. synchronous motor
B. induction motor
C. both and above
D. none of the above
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112. In case of contactors, the contacts are generally made of
A. copper
B. silver
C. cadmium copper
D. all of these
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