electrical engineering MCQs – Page 98

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 Review each marked answer and report any item that may be outdated or unclear.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

1941. Which of the following capacitor is preferred in case of single phase motor ?
0

A. Ceramic capacitor

B. Mica capacitor

C. Electrolytic capacitor

D. Paper capacitor

1942. Dielectric constant for mica is nearly_____________?
0

A. 100

B. 1 to 2

C. 3 to 8

D. 200

1943. Which of the following statement is incorrect ?
0

A. Copper oxide rectifier has a low efficiency

B. Copper oxide rectifier is not a perfect rectifier

C. Copper oxide rectifier is a linear device

D. Copper oxide rectifier finds use in control circuits

E. Copper oxide rectifier is not stable during early life

1944. A constant-voltage generator has___________?
0

A. low internal resistance

B. minimum efficiency

C. minimum current capacity

D. high internal resistance

1945. If ground is applied to the (+) terminal of an inverting op-amp, the () terminal will_____________?
0

A. Not invert the signal

B. Have high reverse current

C. Not need an input resistor

D. Be virtual ground

1946. If the fault occurs near the impedance relay, the VII ratio will be____________?
0

A. lower than that of if fault occurs away from the relay

B. higher than that of if fault occurs away from the relay

C. none of the above

D. constant for all distances

1947. Which of the following medium is employed for extinction of arc in air circuit breaker?
0

A. Air

B. SF6

C. Oil

D. Water

1948. The initial permeability of an iron rod is________________?
0

A. the highest permeability of the iron rod

B. the lowest permeability of the iron rod

C. the permeability almost in non-magnetised state

D. the permeability at the end of the iron rod

1949. Shunt capacitance is neglected while considering______________?
0

A. medium transmission line

B. long transmission line

C. medium and long transmission lines

D. short transmission line

1950. Which of the following devices will receive voltage surge first travelling on the transmission line ?
0

A. Relays

B. Lightning arresters

C. Step-down transformer

D. Switchgear

1951. In a mercury arc rectifier positive ions are attracted towards______________?
0

A. anode

B. shell bottom

C. cathode

D. mercury pool

1952. Protective relays are devices that detect abnormal conditions in electrical circuits by measuring_____________?
0

A. voltage during abnormal condition

B. constantly the electrical quantities which differ during normal and abnormal conditions

C. current during abnormal condition

D. none of the above

1953. A 300 mm long conductor is carrying a current of 10 A and is situated at right angles to a magnetic field having a flux density of 0.8 T ; the force on the conductor will be____________?
0

A. 240 N

B. 24 N

C. 0.24 N

D. 2.4 N

1954. Hysteresis loop in case of magnetically hard materials is more in shape as compared to magnetically soft materials
0

A. rectangular

B. none of the above

C. circular

D. triangular

1955. A balanced 3-phase system consists of_______________?
0

A. zero, negative and positive sequence currents

B. positive sequence currents only

C. negative and zero sequence currents

D. zero sequence currents only

1956. How does the magnetic compass needle behave in a magnetic field ?
0

A. None of the above

B. It assures a position which follows a line of magnetic flux

C. It starts rotating

D. It assures a position right angle to magnetic field

1957. Short-circuit currents are due to_______________?
0

A. single phase to ground faults

B. phase to phase faults

C. any of these

D. three phase faults

E. two phase to ground faults

1958. The potential drop in the arc, in a mercury arc rectifier, varies_____________?
0

A. 0.5 V to 1.5 V per cm length of the arc

B. 0.05 V to 0.2 V per cm length of the arc

C. none of the above

D. 2 V to 3.5 V per cm length of the arc

1959. Which of the following statements is correct ?
0

A. The conductivity of ferrites is better than ferromagnetic materials

B. The conductivity of ferromagnetic materials is better than ferrites

C. The conductivity of ferrites is same as that of ferromagnetic materials

D. The conductivity of ferrites is very high

1960. Large internal faults are protected by_______________?
0

A. merz price percentage differential protection

B. earth fault and positive sequence relays

C. mho and ohm relays

D. horn gaps and temperature relays

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