electrical engineering MCQs – Page 81

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 Review each marked answer and report any item that may be outdated or unclear.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

1601. Capacitance grading of cable implies__________?
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A. cables using single dielectric in different concentrations

B. none of the above

C. grading according to capacitance of cables per km length

D. use of dielectrics of different permeabilities

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

1602. It is noticed that durum charging___________?
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A. specific gravity of H2SO4 is increased

B. the anode becomes chocolate brown in colour (PbCfe) and cathode becomes grey metallic lead (Pb)

C. energy is absorbed by the cell

D. there is a rise in voltage

E. all of the above

1603. During the idle period of the battery, strong electrolyte tends to change the active material of the cell into____________?
0

A. Pb02

B. PbSC-4

C. Pb

D. PbO

1604. Lead-acid cell has a life of nearly charges and discharges______________?
0

A. 500

B. 1250

C. 1000

D. 700

1605. The best indication about the state of charge on a lead-acid battery is given by____________?
0

A. specific gravity of electrolyte

B. output voltage

C. none of the above

D. temperature of electrolyte

1606. The input of an A.C. circuit having power factor of 0.8 lagging is 40 kVA The power drawn by the circuit is__________?
0

A. 22 kW

B. 64 kW

C. 32 kW

D. 12 kW

1607. Over charging______________?
0

A. produces excessive gassing

B. increases the temperature resulting in buckling of plates

C. loosens the active material

D. all above

1608. At very low frequencies a series R-C circuit behaves as almost purely___________?
0

A. resistive

B. none of the above

C. capacitive

D. inductive

1609. Pure inductive circuit takes power from the A.C. line when_________?
0

A. applied voltage decreases but current increases

B. applied voltage increases but current decreases

C. both applied voltage and current increase

D. both applied voltage and current decrease

1610. For the same peak value, which of the following wave has the least mean value ?
0

A. square wave

B. half wave rectified sine wave

C. sine wave

D. triangular wave

1611. The r.m.s. value and mean value is the same in the case of___________?
0

A. sine wave

B. square wave

C. triangular wave

D. half wave rectified sine wave

1612. In an AC. circuit, a low value of kVAR compared with kW indicates_________?
0

A. low efficiency

B. maximum load current

C. unity power factor

D. high power factor

1613. Dielectric strength of rubber is around____________?
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A. 15 kV/mm

B. 5 kV/mm

C. 30 kV/mm

D. 200 kV/mm

1614. If a cable of homogeneous insulation has a maximum stress of 10 kV/mm, then the dielectric strength of insulation should be_______________?
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A. 5 kV/mm

B. 30 kV/mm

C. 15 kV/mm

D. 10 kV/mm

1615. In R-L-C series resonant circuit magnitude of resonance frequency can be changed by changing the value of__________?
0

A. R only

B. R,LorC

C. L only

D. C only

E. LorC

1616. Battery container should be acid resistance, therefore it is made up of___________?
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A. all above

B. wood

C. plastic

D. glass

1617. The internal resistance of an alkali cell is nearly _________ times that of the lead-acid cell
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A. five

B. two

C. four

D. three

1618. Those substances of the cell which take active part in chemical combination and hence produce electricity during charging or discharging are known as________materials
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A. active

B. inert

C. passive

D. redundant

1619. Which of the following circuit component opposes the change in the circuit voltage ?
0

A. Conductance

B. Resistance

C. Inductance

D. Capacitance

1620. Which of the following waves has the highest value of peak factor ___________?
0

A. Triangular wave

B. Half wave rectified sine wave

C. Square wave

D. Sine wave

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