electrical engineering MCQs – Page 35

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 Review each marked answer and report any item that may be outdated or unclear.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
681. Due to which of the following reasons the cables should not be operated too hot ?
comments icon0

A. Expansion of the oil may cause the sheath to burst

B. The oil may loose its viscosity and it may start drawing off from higher levels

C. The thermal instability may rise due to the rapid increase of dielectric losses with temperature

D. Unequal expansion may create voids in the insulation which will lead to ionization

E. All of the above
682. A 3-phase 4 wire system is commonly used on________________?
comments icon0

A. primary transmission

B. primary distribution

C. secondary distribution

D. secondary transmission

683. In aluminium conductors, steel core is provided to____________?
comments icon0

A. compensate for skin effect

B. reduce line inductance

C. increase the tensile strength

D. neutralise proximity effect

684. Which of the following is usually not the generating voltage__________?
comments icon0

A. 6.6 kV

B. 11kV

C. 9.9 kV

D. 13.2kV

685. A Transformer transforms____________?
comments icon0

A. current and voltage

B. power

C. voltage

D. current

686. The usual spans with R.C.C. poles are_______________?
comments icon0

A. 300500 meters

B. 4050 meters

C. 60100 meters

D. 80100 meters
687. Which of the following methods is used for laying of underground cables ?
comments icon0

A. Draw-in-system

B. Direct laying

C. All of the above

D. Solid system

688. The capacity of large turbo-generators varies from___________?
comments icon0

A. 100 to 650 MW

B. 50 to 300 MW

C. 20 to 100 MW

D. 70 to 400 MW

689. Large industrial consumers are supplied electrical energy at__________________?
comments icon0

A. 400 V

B. 11 kV

C. 400 kV

D. 66 kV

690. The speed of a D.C. shunt motor more than its full-load speed can be obtained by_____________?
comments icon0

A. increasing the armature current

B. increasing the field current

C. decreasing the armature current

D. decreasing the field current
691. These days D.C. motors are widely used in____________?
comments icon0
A. electric traction

B. air compressors

C. machine shops

D. pumping sets

692. Brushes of D.C. machines are made of_________?
comments icon0
A. carbon

B. all of above

C. hard copper

D. soft copper

693. A series generator can self-excite:______________?
comments icon0

A. only if the load current is zero

B. only if the load current is not zero

C. irrespective of the value of load current

D. none of the above

694. Which of the following losses are significantly reduced by laminating the core of a D.C. generator ?
comments icon0
A. Eddy current losses

B. Copper losses

C. Windage losses

D. Hysteresis losses

695. While applying Flemings right-hand rule to And the direction of induced e.m.f., the thumb points towards___________?
comments icon0

A. direction of motion of the conductor if forefinger points in the direction of generated e.m.f.

B. direction of flux

C. direction of induced e.m.f.

D. direction of motion of conductor, if forefinger points along the lines of flux
696. In a D.C. shunt motor, under the conditions of maximum power, the current in the armature will be_____________?
comments icon0

A. rated full-load current

B. almost negligible

C. more than full-load current

D. less than full-load current

697. For constant torque drive which speed control method is preferred ?
comments icon0

A. Field control

B. Shunt armature control

C. Mechanical loading system

D. Armature voltage control
698. In case of D.C. machine winding, number of commutator segments is equal to______________?
comments icon0

A. number of armature turns

B. number of armature conductors

C. number of armature coil sides

D. number of armature coils
699. The condition for maximum efficiency for a D.C. generator is______________?
comments icon0

A. copper losses = 0

B. hysteresis losses = eddy current losses

C. eddy current losses = stray losses

D. variable losses = constant losses
700. By looking at which part of the motor, it can be easily confirmed that a particular motor is D.C. motor?
comments icon0

A. Stator

B. Shaft

C. Commutator

D. Frame