electrical engineering MCQs – Page 107

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 Review each marked answer and report any item that may be outdated or unclear.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

2121. A non inverting closed loop op amp circuit generally has a gain factor______________?
0

A. Equal to one

B. Greater than one

C. Of zero

D. Less than one

2122. What will be the reflection co-efficient of the wave of load connected to transmission line if surge impedance of the line is equal to load ?
0

A. None of the above

B. Zero

C. Infinity

D. Unity

2123. Normally, which of the following is used, when a large-scale conversion from AC. to D.C. power is required ?
0

A. Motor converter

B. Motor-generator set

C. Mercury arc rectifier

D. Rotary converter

2124. To produce cathode spot in a mercury arc rectifier______________?
0

A. anode is heated

B. low mercury vapour pressures are used

C. an auxiliary electrode is used

D. tube is evacuated

2125. The susceptibility of paramagnetic materials generally lies between____________?
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A. KT3 and 1CT6

B. 10?2 and KT5

C. KT4 and KT8

D. 1CT3 and 1CT7

2126. The magnetic reluctance of a material______________?
0

A. increases with increasing cross-sec-tional area of material

B. any of the above

C. decreases with increasing cross sectional area of material

D. does not vary with increasing cross-sectional area of material

2127. Paramagnetic materials have relative permeability________________?
0

A. equal to unity

B. slightly less than unity

C. slightly more than unity

D. equal to that ferromagnetic mate rials

2128. The working of a meter is based on the use of a permanent magnet. In order to protect the meter functioning from stray magnetic fields______________?
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A. a soft iron shielding is used

B. a shielding of anon-magnetic material is used

C. a plastic shielding is provided

D. meter is surrounded by strong magnetic fields

2129. For an op-amp having differential gain Av and common-mode gain Ac the CMRR is given by___________?
0

A. Av / Ac

B. 1 + Av / AC.

C. Ac / Av

D. Av + Ac

2130. Which of the following mercury arc rectifier will deliver least undulating current?
0

A. Six-phase

B. Three-phase

C. Single-phase

D. Two-phase

2131. A permeable substance is one_____________?
0

A. which is a strong magnet

B. which is a good conductor

C. through which the magnetic lines of force can pass very easily

D. which is a bad conductor

2132. For cost and safety, the outdoor substations are installed for voltages above_________________?
0

A. 33 kV

B. 60kV

C. 110kV

D. 11 kV

2133. The reflection co-efficient at the open circuited end of a transmission line___________?
0

A. zero

B. unity

C. none of the above

D. infinity

2134. In which of the following appUcations, direct current is absolutely essential ?
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A. Illumination

B. Traction

C. Electrolysis

D. Variable speed operation

2135. Reciprocal of permeability is____________?
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A. conductance

B. permittivity

C. reluctivity

D. susceptibility

2136. Out of the following statements, concerning an electric field, which statement is not true ?
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A. The electric field intensity at a point is numerically equal to the force exerted upon a charge placed at that point

B. An electric field is defined as a point in space at which an electric charge would experience a force

C. Unit field intensity in the exertion of a force of one newton on a charge of one coulomb

D. The electric intensity is a vector quantity

2137. One maxwell is equal to____________?
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A. 10 webers

B. 10 webers

C. 10 webers

D. 10 webers

2138. An efficient and a well designed protective relaying should have_____________?
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A. all of the above

B. economy and simplicity

C. good selectivity and reliability

D. high speed and selectivity

2139. Which of the following is not a unit of flux?
0

A. Weber

B. All of the above

C. Maxwell

D. Telsa

2140. The Biot-savarts law is a general modification of_______________?
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A. Lenzs law

B. Amperes law

C. Kirchhoffs law

D. Faradays laws

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