electrical engineering MCQs – Page 283

Practise multiple-choice questions from electrical engineering for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

electrical engineering Mcqs
1. economics of power generation2. analog electronics3. solid state switching circuits4. parallel circuits5. switchgear and protection6. op amp circuits7. transistor audio power amplifiers8. electrostatics9. heating and welding10. multi stage transistor amplifiers11. passive filters12. network theorems13. regulated d c power supply14. a c fundamentals circuits and circuit theory15. electromagnetic induction16. power electronics17. magnetism and electromagnetism18. transformers19. modulation and demodulation20. d c generators21. semiconductor theory22. single phase induction motors23. semiconductor diode24. hybrid parameters25. digital electronics26. oscillators27. earthing or grounding28. single stage transistor amplifiers29. d c motors30. transistor biasing31. amplifiers with negative feedback32. basic electrical33. electronic instruments34. synchronous motors35. field effect transistors fet36. magnetic circuit37. control systems38. industrial drives39. power generation40. series parallel circuits41. transistor tuned amplifiers42. electrical engineering materials43. rectifiers and converters44. integrated circuits45. scr silicon controlled rectifiers46. cables47. polyphase induction motors48. measurement and instrumentation49. transistors50. electrical machine design51. electrolysis and storage of batteries52. electric traction53. transmission and distribution
5641. Which motor should not be started on no-load ?
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A. Cumulatively compounded motor

B. Series motor

C. Shunt motor

D. Differentially compounded motor

5642. If I2 be the armature current, then speed of a D.C. shunt motor is_______________?
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A. varies as (Ia)

B. proportional to la

C. independent of Ia

D. varies as la

5643. Which D.C. motor has got maximum self relieving property ?
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A. Series motor

B. Shunt motor

C. Cumulatively compounded motor

D. Differentially compounded motor

5644. In a manual shunt motor starter?
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A. over load relay is connected in series and no volt relay in parallel with the load

B. over load relay is connected in parallel and no volt relay in series with the load

C. over load relay and no volt relay are both connected in series with the load

D. over load relay and no volt relay are both connected in parallel with the load

5645. The purpose of retardation test on D.C. shunt machines is to find out____________?
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A. eddy current losses

B. stray losses

C. field copper losses

D. windage losses

5646. Where D.C. motor of H.P. 12 or more requires frequent starting, stopping, reversing and speed control______________?
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A. four point starter is used

B. three point starter is used

C. drum type controller is used

D. all above can be used

5647. With the increase in temperature, the speed of DC shunt motor____________?
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A. decreases.

B. remain same

C. increases

D. none of the above

5648. For which types of D.C. motor, dynamic braking is generally used ?
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A. Shunt motors

B. All of the above

C. Compound motors

D. Series motors

5649. Which of the following law/rule can he used to determine the direction of rotation of D.C. motor ?
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A. Coloumbs law

B. Lenzs law

C. Faradays law

D. Flemings left-hand rule
5650. As there is no back e.m.f. at the instant of starting a D.C. motor, in order to prevent a heavy current from flowing though the armature circuit____________________?
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A. a resistance is connected parallel to the armature

B. a high value resistor is connected across the field winding

C. a resistance is connected in series with armature

D. armature is temporarily open circuited

5651. In a D.C. generator all of the following could be the effects of iron losses except___________?
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A. Loss of efficiency

B. Rise in temperature of ventilating air

C. Increase in terminal voltage

D. Excessive heating of core

5652. The speed of a D.C. shunt motor is required to be more than full load speed. This is possible by______________?
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A. increasing the excitation current

B. none of the above methods

C. reducing the field current

D. decreasing the armature current

E. increasing the armature current

5653. For constant torque drive which speed control method is preferred ?
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A. Field control

B. Shunt armature control

C. Mechanical loading system

D. Armature voltage control
5654. For the same H.P. rating and full load speed, following motor has poor starting torque_____________?
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A. differentially compounded

B. series

C. shunt

D. cumulativelycompounded

5655. Which D.C. motor will be suitable along with flywheel for intermittent light and heavy loads?
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A. Shunt motor

B. Series motor

C. Cumulatively compounded motor

D. Differentially compounded motor

5656. Ward Leonard method of speed control is basically a______________?
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A. frequency control method

B. armature controlled method

C. field control method

D. field diverter

5657. The power mentioned on the name plate of an electric motor indicates____________?
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A. the gross power

B. the power drawn in kW

C. the power drawn in kVA

D. the output power available at the shaft
5658. These days D.C. motors are widely used in____________?
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A. electric traction

B. machine shops

C. pumping sets

D. air compressors

5659. In a D.C. shunt motor, speed is______________?
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A. independent of armature current

B. directly proportional to the armature current

C. inversely proportional to the armature current

D. proportional to the square of the current

5660. If the speed of a D.C. shunt motor is increased, the back e.m.f. of the motor will_________?
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A. become zero

B. remain same

C. decrease

D. increase