electrical engineering MCQs – Page 96

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 Review each marked answer and report any item that may be outdated or unclear.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

1901. As per Faradays laws of electromagnetic induction, an e.m.f. is induced in a conductor whenever it_______________?
0

A. moves parallel to the direction of the magnetic field

B. cuts magnetic flux

C. lies in a magnetic field

D. lies perpendicular to the magnetic flux

1902. capacitors are used for audio frequency and radio frequency coupling and tuning ?
0

A. Plastic film

B. Air

C. Mica

D. Ceramic

1903. In selenium rectifiers efficiencies ranging from _______ to _______ percent are attainable?
0

A. 60, 70

B. 25, 35

C. 75, 85

D. 40, 50

1904. Which is the most superior dielectric out of the following ?
0

A. Glass

B. Air

C. Paper

D. Bakelite

1905. The potential gradient across the material of low permittivity is than across the material of high permittivity?
0

A. smaller

B. greater

C. both (A) and (B)

D. none of the above

1906. Reversing the field or the current will reverse the force on the conductor
0

A. Yes

B. No

1907. The property of a material which opposes the creation of magnetic flux in it is known as_____________?
0

A. reluctivity

B. permeance

C. reluctance

D. magnetomotive force

1908. Permanent magnets are normally made of_____________?
0

A. cast iron

B. aluminium

C. wrought iron

D. alnico alloys

1909. Current changing from 8 A to 12 A in one second induced 20 volts in a coil. The value of inductance is___________?
0

A. 5 H

B. 5 mH

C. 10 mH

D. 10 H

1910. If an ohmmeter reading immediately goes practically to zero and stays there, capacitor is___________?
0

A. lossy

B. charged

C. short-circuited

D. satisfactory

1911. Higher the self-inductance of a coil_____________?
0

A. lower the e.m.f. induced

B. longer the delay in establishing steady current through it

C. greater the flux produced by it

D. lesser its weber-turns

1912. Two plates of a parallel plate capacitor after being charged from a constant voltage source are separated apart by means of insulated handles, then the____________?
0

A. voltage across the plates decreases

B. charge on the capacitor decreases

C. Voltage across the plates increases

D. charge on the capacitor increases

1913. A capacitor in a circuit became hot and ultimately exploded due to wrong connections, which type of capacitor it could be ?
0

A. Ceramic capacitor

B. Electrolytic capacitor

C. Any-of the above

D. Paper capacitor

1914. Which of the following circuit elements will oppose the change in circuit current ?
0

A. Resistance

B. Inductance

C. All of the above

D. Capacitance

1915. In an iron cored coil the iron core is removed so that the coil becomes an air cored coil. The inductance of the coil will_____________?
0

A. increase

B. remain the same

C. decrease

D. initially increase and then decrease

1916. While preparing electrolyte for a lead-acid battery___________?
0

A. anyone of the two can be added to other chemical

B. acid is poured into water

C. water is poured into acid

1917. Which of the following material has least value of dielectric constant ?
0

A. Ceramics

B. Glass

C. Oil

D. Paper

1918. A single core cable used on 33000 V has conductor diameter 10 mm and the internal diameter of sheath 25 mm. The maximum electrostatic stress in the cable is____________?
0

A. 72 x 105 V/m

B. 62 x 105 V/m

C. 92 x 105 V/m

D. 82 x 105 V/m

1919. While testing a capacitor with ohm meter, if the capacitor shows charging, but the final resistance reading is appreciably less than normal, it can be concluded that the capacitor is____________?
0

A. short-circuited

B. alright

C. open circuited

D. leaky

1920. Paper condenser is___________?
0

A. electrolytic condenser

B. always polarised

C. a variable condenser

D. usually of fixed value

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