electrical engineering MCQs – Page 249

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 Review each marked answer and report any item that may be outdated or unclear.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

4961. 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. 0.24 N

C. 2.4 N

D. 24 N

4962. Which of the following is a ferromagnetic material ?
0

A. Tungsten

B. Copper

C. Aluminium

D. Nickel

4963. The susceptibility of paramagnetic materials generally lies between____________?
0

A. 1CT3 and 1CT7

B. 10?2 and KT5

C. KT4 and KT8

D. KT3 and 1CT6

4964. Ferrites are a sub-group of_______________?
0

A. ferro-magnetic materials

B. paramagnetic materials

C. ferri-magnetic materials

D. non-magnetic materials

4965. The unit of flux is the same as that of_______________?
0

A. resistance

B. reluctance

C. pole strength

D. permeance

4966. Flemings left hand rule is used to find_________________?
0

A. direction of flux in a solenoid

B. direction of magnetic field due to current carrying conductor

C. polarity of a magnetic pole

D. direction of force on a current carrying conductor in a magnetic field

4967. Main causes of noisy solenoid are______________?
0

A. strong tendency of fan out of laminations at the end caused by repulsion among magnetic lines of force

B. uneven bearing surface, caused by dirt or uneven wear between moving and stationary parts

C. both of above

D. none of the above

4968. When a magnet is in motion relative to a coil the induced e.m.f. does not depend upon____________?
0

A. number of turns of the coil

B. motion of the magnet

C. resistance of the coil

D. pole strength of the magnet

4969. Hysteresis loop in case of magnetically hard materials is more in shape as compared to magnetically soft materials
0

A. triangular

B. circular

C. rectangular

D. none of the above

4970. What will be the magnetic potential difference across the air gap of 2 cm length in magnetic field of 200 AT/m ?
0

A. 6 AT

B. 4 AT

C. 2 AT

D. 10 AT

4971. Paramagnetic materials have relative permeability________________?
0

A. equal to unity

B. slightly more than unity

C. slightly less than unity

D. equal to that ferromagnetic mate rials

4972. For which of the following materials the net magnetic moment should be zero ?
0

A. Ferrimagnetic materials

B. Diamagnetic materials

C. Antiferromagnetic materials

D. Antiferrimagnetic materials

4973. A transformer core is laminated to__________?
0

A. reduce copper losses

B. reduce hysteresis loss

C. reduce eddy current losses

D. reduce all above losses

4974. The no load current in a transformer lags behind the applied voltage by an angle of about_____________?
0

A. 90

B. 120?

C. 75

D. 180

4975. Which type of winding is used in 3 phase shell-type transformer?
0

A. Circular type

B. Sandwich type

C. Rectangular type

D. Cylindrical type

4976. No-load current of a transformer has_____________?
0

A. has small magnitude and low power factor

B. has small magnitude and high power factor

C. has high magnitude and high power factor

D. has high magnitude and low power factor

4977. Spacers are provided between adjacent coils?
0

A. to provide free passage to the cooling oil

B. to insulate the coils from each other

C. both A. and (b)

D. none of the above

4978. A common method of cooling a power transformer is_______________?
0

A. any of the above

B. natural air cooling

C. oil cooling

D. air blast cooling

4979. The noise resulting from vibrations of laminations set by magnetic forces, is termed as_________________?
0

A. zoom

B. magnetostrication

C. hum

D. boo

4980. Delta/star transformer works satisfactorily when______________?
0

A. on balanced as well as unbalanced loads

B. none of the above

C. load is balanced only

D. load is unbalanced only

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