Rotor of a motor is usually supported on _________ bearings.
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When the load is above _________ a synchronous motor is found to be more economical.
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For derris and winches which of the following drives can be used?
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Which of the following motors is preferred for traction work?
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Belted slip ring induction motor is almost invariably used for
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Which feature, while selecting a motor for centrifugal pump, will be of least significance?
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While selecting an electric motor for a floor mill, which electrical characteristics will be of least significance?
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Which of the following motors is preferred when quick speed reversal is the main consideration?
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For blowers which of the following motor is preferred?
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________ need frequent starting and stopping of electric motors,
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The load cycle for a motor driving a power press will be
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Which of the following motors is used for elevators?
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Ward-Leonard controlled D.C. drives are generally used for _________ excavators.
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A reluctance motor
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Which of the following motors are preferred for overhead traveling cranes?
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In jaw crushers a motor has to often start against ________ load.
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For which of the following applications D.C. motors are still preferred?
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Is not a part of ball bearing?
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The characteristics of drive for crane hoisting and lowering are which of the following?
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The starting torque of a D.C. motor is independent of which of the following?
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