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Q. 71) The characteristics of drive for crane hoisting and lowering are which off the following?
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Q. 72) In ........the speed can be varied by changing the position of brushes
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Q. 73) In which of the following applications variable speed operation is preferred?
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Q. 74) The number of operations per hour in case of class IV contactor will be around
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Q. 75) In case of contactors, the duty in which the main contacts remain closed for a period bearing a definition relation to the no-load periods, is known as
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Q. 76) In case of contactors the ratio of the in service period to the entire period, expressed as a percentage is known as
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Q. 77) A class I contactor should be mechanically sound to withstand
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Q. 78) Which of the following pair is used for frequency converters ?
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Q. 79) Belted wound rotor induction motors are preferred for
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Q. 80) The cooling time constant is usually
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