Electrical Engineering MCQs

Page No. 43

Which part of a motor needs maximum attention for maintenance ?


aFrame


bRearing


cStator winding


dRotor winding


View Answer Rearing

Which feature, while selecting a.motor for centrifugal pump, will be of least significance ?


aStarting characteristics


bOperating speed


cHorse power


dSpeed control


View Answer Speed control

Ward-Leonard controlled D.C. drives are generally used for _____________________ excavators?


aLight duty


bMedium duty


cHeavy duty


dAll of the above


View Answer Heavy duty

For a particular application the type of electric-and control gear are determined by which of the following considerations ?


a Starting torque


bConditions of environment


cSpeed control range and its nature


dAll of the above


View Answer All of the above

The load cycle for a motor driving a power press will be________________?


avariable load


bcontinuous


ccontinuous but periodical


dintermittent and variable load



Which of the following motors always starts on load ?


aConveyor motor


bFloor mill motor


cFan motor


dAll of the above


View Answer All of the above

While selecting an electric motor for a floor mill, which electrical characteristics will be of least significance ?


aRunning characteristics


bStarting characteristics


cEfficiency


dBraking


View Answer Braking

The selection of an electric motor for any application depends on which of the following factors ?


aElectrical characteristics


bMechanical characteristics


cCost


dAll of the above


View Answer All of the above

Which of the following motors is preferred for traction work ?


aUniversal motor


b D.C. series motor


cSynchronous motor


dThree-phase induction motor


View Answer Synchronous motor

________________is preferred for automatic drives?


aSquirrel cage induction motor


bSynchronous motors


cWard-Leonard controlled D.C. motors


dAny of the above



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