Electrical Engineering MCQs

Page No. 295

For the same H.P. rating and full load speed, following motor has poor starting torque_____________?


ashunt


bseries


cdifferentially compounded


dcumulativelyc’ompounded



D.C. series motors are used______________?


awhere load is constant


bwhere load changes frequently


cwhere constant operating speed is needed


din none of the above situations



If a D.C. shunt motor is working at no load and if shunt field circuit suddenly opens__________?


anothing will happen to the motor


bthis will make armature to take heavy current, possibly burning it


cthis will result in excessive speed, possibly destroying armature due to excessive centrifugal stresses D. motor will run at very slow speed


d None of these



Which D.C. motor will be suitable along with flywheel for intermittent light and heavy loads?


aSeries motor


bShunt motor


cCumulatively compounded motor


dDifferentially compounded motor



Which D.C. motor has got maximum self loading property?


aSeries motor


bShunt motor


cCumulatively compounded ‘motor


dDifferentially compounded motor



The power mentioned on the name plate of an electric motor indicates____________?


a the power drawn in kW


b the power drawn in kVA


cthe gross power


dthe output power available at the shaft



The current drawn by the armature of D.C. motor is directly proportional to__________?


athe torque required


bthe speed of the motor


cthe voltage across the terminals


dnone of the above


View Answer the torque required

In a D.C. series motor, if the armature current is reduced by 50%, the torque of the motor will be equal to


a100% of the previous value


b50% of the previous value


c 25% of the previous value


dnone of the above



The speed of a D.C. series motor is_____________?


aproportional to the armature current


bproportional to the armature current


cproportional to field current


dinversely proportional to the armature current



The starting resistance of a D.C. motor is generally_______________?


alow


baround 500 Q


c1000 Q


dinfinitely large


View Answer low

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