electrical engineering MCQs – Page 254

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 Review each marked answer and report any item that may be outdated or unclear.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 generation 2. analog electronics 3. solid state switching circuits 4. parallel circuits 5. switchgear and protection 6. op amp circuits 7. transistor audio power amplifiers 8. electrostatics 9. heating and welding 10. multi stage transistor amplifiers 11. passive filters 12. network theorems 13. regulated d c power supply 14. a c fundamentals circuits and circuit theory 15. electromagnetic induction 16. power electronics 17. magnetism and electromagnetism 18. transformers 19. modulation and demodulation 20. d c generators 21. semiconductor theory 22. single phase induction motors 23. semiconductor diode 24. hybrid parameters 25. digital electronics 26. oscillators 27. earthing or grounding 28. single stage transistor amplifiers 29. d c motors 30. transistor biasing 31. amplifiers with negative feedback 32. basic electrical 33. electronic instruments 34. synchronous motors 35. field effect transistors fet 36. magnetic circuit 37. control systems 38. industrial drives 39. power generation 40. series parallel circuits 41. transistor tuned amplifiers 42. electrical engineering materials 43. rectifiers and converters 44. integrated circuits 45. scr silicon controlled rectifiers 46. cables 47. polyphase induction motors 48. measurement and instrumentation 49. transistors 50. electrical machine design 51. electrolysis and storage of batteries 52. electric traction 53. transmission and distribution

5061. The noise produced by a transformer is termed as_______________________?
0

A. hum

B. zoom

C. ringing

D. buzz

5062. Which of the following loss in a transformer is zero even at full load ____________?
0

A. Eddy current loss

B. Friction loss

C. Core loss

D. Hysteresis loss

5063. An ideal transformer is one which has_____________?
0

A. none of the above

B. interleaved primary and secondary windings

C. no losses and magnetic leakage

D. a common core for its primary and secondary windings

E. core of stainless steel and winding of pure copper metal

5064. A transformer oil must be free from________________?
0

A. gases

B. moisture

C. odour

D. sludge

5065. In a transformer the tappings are generally provided on_____________?
0

A. secondary side

B. primary side

C. high voltage side

D. low voltage side

5066. Material used for construction of transformer core is usually___________________?
0

A. copper

B. aluminium

C. silicon steel

D. wood

5067. The maximum efficiency of a distribution transformer is____________?
0

A. at no load

B. at full load

C. at 80% full load

D. at 50% full load

5068. A shell-type transformer has_________?
0

A. negligibly hysteresis losses

B. none of the above

C. high eddy current losses

D. reduced magnetic leakage

5069. The size of a transformer core will depend on__________?
0

A. frequency

B. flux density of the core material

C. A. and B. both

D. area of the core

5070. For the parallel operation of single phase transformers it is necessary that they should have___________?
0

A. same efficiency

B. same polarity

C. same kVA rating

D. same number of turns on the secondary side.

5071. Primary winding of a transformer________________?
0

A. is always a low voltage winding

B. could either be a low voltage or high voltage winding

C. is always a high voltage winding

D. none of the above

5072. The maximum load that a power transformer can carry is limited by its________________?
0

A. voltage ratio

B. dielectric strength of oil

C. copper loss

D. temperature rise

5073. The secondary of a current transformer is always short-circuited under operating conditions because it____________________?
0

A. protects the primary circuit

B. is safe to human beings

C. none of the above

D. avoids core saturation and high voltage induction

5074. A transformer cannot raise or lower the voltage of a D.C. supply because_______________?
0

A. a D.C. circuit has more losses

B. none of the above

C. Faradays laws of electromagnetic induction are not valid since the rate of change of flux is zero

D. there is no need to change the D.C. voltage

5075. Auto-transformer makes effective saving on copper and copper losses, when its transformation ratio is_________________?
0

A. approximately equal to one

B. less than one

C. none of the above

D. great than one

5076. Which of the following protection is normally not provided on small distribution transformers ?
0

A. Buchholz relay

B. Overfluxing protection

C. Overcurrent protection

D. All of the above

5077. Minimum voltage regulation occurs when the power factor of the load is_____________?
0

A. leading

B. zero

C. unity

D. lagging

5078. Short circuit test on transformers is conducted to determine____________?
0

A. core losses

B. hysteresis losses

C. eddy current losses

D. copper losses

5079. Negative voltage regulation is indicative that the load is___________?
0

A. capacitive only

B. none of the above

C. inductive only

D. inductive or resistive

5080. A Transformer transforms____________?
0

A. current and voltage

B. power

C. voltage

D. current

Previous Next

Showing 5061 to 5080 of 7381 mcqs