electrical engineering MCQs – Page 337

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 Review each marked answer and report any item that may be outdated or unclear.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
6721. Natural rubber is obtained from milky sap of tropical trees
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A. Yes

B. No

6722. The metallic sheath may be made of lead or lead alloy or of aluminium ?
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A. Yes

B. No
6723. Cables for 220 kV lines are invariably____________?
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A. none of the above

B. rubber insulated

C. compressed oil or compressed gas insulated

D. mica insulated

E. paper insulated

6724. The thickness of the layer of insulation on the conductor, in cables, depends upon___________?
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A. voltage

B. reactive power

C. power factor

D. current carrying capacity

6725. The intersheaths in the cables are used to_____________?
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A. avoid the requirement of good insulation

B. provide proper stress distribution

C. none of the above

D. minimize the stress

6726. In the cables, the location of fault is usually found out by comparing____________?
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A. the resistance of the conductor

B. the capacitances of insulated conductors

C. all above parameters

D. the inductance of conductors

6727. Low tension cables are generally used up to___________?
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A. 500 V

B. 1000 V

C. 700 V

D. 200 V

6728. The advantage of cables over overhead transmission lines is___________?
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A. can be used in congested areas

B. can be used in high voltage circuits

C. low cost

D. easy maintenance

6729. The bedding on a cable consists of____________?
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A. none of the above

B. any of the above

C. jute

D. hessian cloth

6730. In a cable, the maximum stress under operating conditions is at___________?
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A. insulation layer

B. armour

C. sheath

D. conductor surface
6731. If a power cable and a communication cable are to run parallel the minimum distance between the two, to avoid interference, should be______________?
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A. 400 cm

B. 50 cm

C. 10 cm

D. 2 cm

6732. In a cable immediately above metallic sheath ______ is provided
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A. none of the above

B. armouring

C. earthing connection

D. bedding
6733. In a cable the voltage stress is maximum at____________?
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A. sheath

B. insulator

C. core of the conductor

D. surface of the conductor

6734. The insulation of the cable decreases with__________?
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A. the decrease in the length of the insulation

B. either A. or (b)

C. the increase in length of the insulation

D. none of the above

6735. The insulating material for a cable should have__________?
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A. low cost

B. high dielectric strength

C. high mechanical strength

D. all of the above
6736. High tension cables are generally used up to_____________?
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A. 132 kV

B. 11kV

C. 66 kV

D. 33kV

6737. A certain cable has an insulation of relative permittivity 4. If the insulation is replaced by one of relative permittivity 2, the capacitance of the cable will become_____________?
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A. double

B. none of the above

C. four times

D. one half
6738. In capacitance grading of cables we use a _______ dielectric?
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A. homogeneous

B. hygroscopic

C. composite

D. porous

6739. Dielectric strength of rubber is around____________?
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A. 5 kV/mm

B. 30 kV/mm

C. 15 kV/mm

D. 200 kV/mm

6740. Capacitance grading of cable implies__________?
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A. use of dielectrics of different permeabilities

B. cables using single dielectric in different concentrations

C. capacitance required to be introduced at different lengths to counter the effect of inductance

D. none of the above

E. grading according to capacitance of cables per km length