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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

107. Belted slip ring induction motor is almost invariably used for
A. centrifugal blowers
B. water pumps
C. jaw crushers
D. heavy load

108. In jaw crushers, generally a motor has to start against
A. low load
B. medium load
C. normal load
D. heavy load

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

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

111. A reluctance motor on over load runs as
A. synchronous motor
B. induction motor
C. both and above
D. none of the above

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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