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