Electrical Engineering MCQs

Page No. 40

_______________has the least value of starting torque to full load torque ratio?


a D.C. shunt motor

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b D.C. series motor

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cSquirrel cage induction motor

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dSlip ring induction motor

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View Answer D.C. series motor

Battery operated scooter for braking uses__________________?


aplugging

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bmechanical braking

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cregenerative braking

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drheostatic braking

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View Answer rheostatic braking

Which of the following machines has heavy fluctuation of load ?


aPrinting machine

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bPunching machine

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cPlaner

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dLathe

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View Answer Lathe

In which of the following applications the load on motor changes in cyclic order ?


aElectric shovels

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bCranes

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cRolling mills

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dAll of the above

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View Answer All of the above

For derries and winches which of the following drives can be used ?


aPole changing squirrel cage motors

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b D.C. motors with Ward-leonard con-trol

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cA.C. slip ring motors with variable resistance

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dAny of the above

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View Answer Any of the above

In case of _______________ speed control by injecting e.m.f. in the rotor circuit is possible?


ad.c. shunt motor

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bschrage motor

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c synchronous motor

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d slip ring induction motor

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___________________has least range of speed control?


aSlip ring induction motor

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bSynchronous motor

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cD.C. shunt motor

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dSchrage motor

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View Answer Synchronous motor

Flame proof motors are used in_________________?


apaper mills

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b steel mills

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cmoist atmospheres

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d explosive atmospheres

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In squirrel cage induction motors which of the following methods of starting cannot be used ?


aResistance in rotor circuit

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b Resistance in stator circuit

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c Auto-transformer starting

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dStar-delta starting

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Heat control switches are used in__________________?


atransformers

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bcooling ranges

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cthree phase induction motors

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dsingle phase

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View Answer cooling ranges

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