electrical engineering MCQs – Page 86

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 Review each marked answer and report any item that may be outdated or unclear.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

1701. The value of E within the field due to a point charge can be found with the help of___________?
0

A. Kirchhoff s laws

B. none of the above

C. Faradays laws

D. Coulombs laws

1702. A conductor carries 125 amperes of current under 60 to a magnetic field of 1.1 tesla. The force on the conductor will be nearly______________?
0

A. 120 N

B. 240 N

C. 480 N

D. 50 N

1703. In a magnetic material hysteresis loss takes place primarily due to___________?
0

A. flux density lagging behind magnetising force

B. it high retentivity

C. rapid reversals of its magnetisation

D. molecular friction

1704. Voltage applied across a ceramic dielectric produces an electrolytic field 100 times greater than air. What will be the value of dielectric constant ________?
0

A. 50

B. 100

C. 150

D. 200

1705. Air capacitors are generally available in the range_________?
0

A. 10 to 400 pF

B. 20 to 100 pF

C. 1 to 20 pF

D. 100 to 900 pF

1706. A capacitance of 100 fiF is connected in series with a resistance of 8000 2. The time constant of the circuit is______________?
0

A. 0.4 s

B. 0.6 s

C. 0.8 s

D. 0.2 s

1707. For a purely inductive circuit which of the following is true ?
0

A. Actual power of the circuit is zero

B. Apparent power is zero

C. Any capacitance even if present in the circuit will not be charged

D. Relative power is.zero

1708. Dielectric strength _________ with increasing thickness
0

A. remains unaltered

B. increases

C. decreases

D. none of the above

1709. A capacitor having capacitance of 5 uF is charged to a potential difference of 10,000 V. The energy stored in the capacitor is__________?
0

A. 150 joules

B. 200 joules

C. 250 joules

D. 50 joules

1710. at a point may be defined as equal to the lines of force passing normally through a unit cross section at that point ?
0

A. Electric flux

B. Electric intensity

C. None of the above

D. Magnetic flux density

1711. Which of the following is not a unit of inductance ?
0

A. Volt second per ampere

B. All of the above

C. Henry

D. Coulomb/volt ampere

1712. A field line and an equipotential surface are____________?
0

A. always parallel

B. always at 90

C. inclined at any angle 0

D. none of the above

1713. Which of the following capacitors will have the least variation ____________?
0

A. Paper capacitor

B. None of the above

C. Ceramic capacitor

D. Silver plated mica capacitor

1714. The self-inductance of the coil may be defined as equal to the e.m.f. induced in volts when the current in the circuit changes at the rate of unit Weber turns
0

A. No

B. Yes

1715. Copper oxide rectifier is usually designed not to operate above___________?
0

A. 20C

B. 30C

C. 10C

D. 45C

1716. A capacitor consists of two____________?
0

A. conductors separated by an insulator

B. insulators separated by a dielectric

C. silver-coated insulators

D. ceramic plates and one mica disc

1717. Which of the following is the loss within the mercury arc rectifier chamber ?
0

A. Voltage drop at the anode

B. All of the above

C. Voltage drop in arc

D. Voltage drop at the cathode

1718. Two coils have self-inductances of 10 H and 2 H, the mutual inductance being zero. If the two coils are connected in series, the total inductance will be_____________?
0

A. 6 H

B. 24 H

C. 8 H

D. 12 H

1719. In a battery cover is placed over the element and sealed to the top of the battery container. This is done____________?
0

A. to reduce evaporation of water from electrolyte

B. to exclude dirt and foreign matter from the electrolyte

C. to discharge both of the above functions

D. to discharge none of the above functions

1720. is that property of a capacitor which delays any change of voltage across it ?
0

A. Potential gradient

B. Inductance

C. None of the above

D. Capacitance

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