130 TOP MOST D.C motors.pdf

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130 130 TOP MOST D.C. MOTORS - Electrical Electrical Engineering Engineering Multiple Choice Choice Quest Questions ions and and Answ Answers ers Electrical Electrical Engineering Engineering Multiple Choice Choice Quest Questions ions

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Home » Electrical Engineering Multiple Choice Questions Home Questi ons » 130 TOP MOST D.C. MOTORS – Electrical Engineering Multiple Ch Ch oice oice Questions an d Answers

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130 TOP TOP MOST MO ST D.C. MOTORS – Elect Electrical rical Engineering Multiple Choice Choice Que uesstions and Answers Download Posted on June 4, 2015 by engineer

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D.C. MOTORS Interview Questions and Answe Answers rs :-

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1. No-load No-load speed of which w hich of the following f ollowing motor will be highest ? (a) Shunt motor (b) Series motor (c) Cumulative compound motor (d) Differentiate compound motor Ans: b 2. The T he direction of of rotation of a D.C. D. C. series motor can be changed by (a) interchanging supply terminals (b) interchanging field terminals (c) either of (a) and (b) above (d) None of the above Ans: b 3. Which of the following application a pplication requires high starting torque ? (a) Lathe machine (b) Centrifugal pump (c) Locomotive (d) Air blower Ans: c 4. If I f a D.C. motor is to be selected for conveyor conveyors, s, which rriotor rriotor would be b e preferred ? (a) Series motor (b) Shunt motor (c) Differentially compound motor (d) Cumulative compound motor Ans: a 5. Which D.C. D. C. motor will be preferred for machine tools ? (a) Series motor (b) Shunt motor (c) Cumulative compound motor

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(d) Differential compound motor Ans: b 6. Differentially Dif ferentially compound D.C. motors can find applications applica tions requiring requiring (a) high starting torque (b) low starting torque (c) variable speed (d) frequent on-off cycles c ycles Ans: b 7. Which W hich D.C. motor is preferred preferred for elevators ? (a) Shunt motor (b) Series motor (c) Differential compound motor (d) Cumulative compound motor Ans: d 8. According to Fleming’s left-hand rule, when w hen the forefinger points in the direction direction of the field or flux, f lux, the middle finger will point in the direction of (a) current in the conductor aovtaat of conductor (c) resultant resultant f orce on conductor (d) none of the above Ans: a 9. If the field of a D.C. D. C. shunt motor gets opened while motor is running (a) the speed speed of motor will b e reduced % (b) the armature current will reduce (c) the motor will atta in dangerously high speed 1 (d) the motor will c ontinue to nuvat constant speed Ans: c 10. 10. Starters St arters are used with D.C. motors because (a) these motors have high starting torque

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(b) these motors are not self-starting (c) back e.m.f. e.m. f. of these motors is zero initially (d) to restrict restrict armature arma ture current as there is no back e.m.f. e.m.f . while starting sta rting Ans: d

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130 TOP MOST D.C motors.pdf

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