A. Oil expeller
B. Floor mill
C. Lifts and hoists
D. Centrifugal pump
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Which of the following happens when star-delta starter is used ?
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Which of the following motors is preferred when smooth and precise speed control over a wide range is desired ?
A. Starting voltage is reduced
B. Starting current is reduced
C. Both A. and B.
D. None of the above
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Which of the following motors is preferred for boom hoist of a travelling crane ?
A. D.C. motor
B. Squirrel cage induction motor
C. Wound rotor induction motor
D. Synchronous motor
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The capacity of a crane is expressed in terms of_______________?
A. Single phase motor
B. Synchronous motor
C. A.C. slip ring motor
D. Ward-Leonard controlled D.C. shunt motor
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Which of the following motors is preferred when quick speed reversal is the main consideration ?
A. type of drive
B. span
C. tonnes
D. any of the above
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A pony motor is used for the starting which of the following motors ?
A. Squirrel cage induction motor
B. Wound rotor induction motor
E. Synchronous motor
D. D.C. motor
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Besides a constant speed a synchronous rotor possesses which of the following advantages ?
A. Squirel cage induction motor
B. Schrage motor
C. Synchronous motor
D. None of the above
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For crane travel which of the following motors is normally used ?
A. Lower cost
B. Better efficiency
C. High power factor
D. All of the above
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The characteristics of drive for crane hoisting and lowering are which of the following ?
A. Synchronous motor
B. D.C. differentially compound motor
C. Ward-Leonard controlled D.C. shunt motor
D. AC. slip ring motor