electrical engineering MCQs – Page 10

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 Review each marked answer and report any item that may be outdated or unclear.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 generation2. analog electronics3. solid state switching circuits4. parallel circuits5. switchgear and protection6. op amp circuits7. transistor audio power amplifiers8. electrostatics9. heating and welding10. multi stage transistor amplifiers11. passive filters12. network theorems13. regulated d c power supply14. a c fundamentals circuits and circuit theory15. electromagnetic induction16. power electronics17. magnetism and electromagnetism18. transformers19. modulation and demodulation20. d c generators21. semiconductor theory22. single phase induction motors23. semiconductor diode24. hybrid parameters25. digital electronics26. oscillators27. earthing or grounding28. single stage transistor amplifiers29. d c motors30. transistor biasing31. amplifiers with negative feedback32. basic electrical33. electronic instruments34. synchronous motors35. field effect transistors fet36. magnetic circuit37. control systems38. industrial drives39. power generation40. series parallel circuits41. transistor tuned amplifiers42. electrical engineering materials43. rectifiers and converters44. integrated circuits45. scr silicon controlled rectifiers46. cables47. polyphase induction motors48. measurement and instrumentation49. transistors50. electrical machine design51. electrolysis and storage of batteries52. electric traction53. transmission and distribution
181. The output power of the cascaded amplifier / attenuator system can be determined using___________?
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A. Gain in dB of amplifier and attenuator

B. Actual gain of attenuator

C. Actual gain of amplifier

D. Actual gain of amplifier and attenuator
182. Thyristor can be protected from over voltages by using
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A. 10 mA.

B. 60 mA.

C. 40 mA.

D. 23 mA.

183. The resistivity of the conductor depends on
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A. length of the conductor.

B. area of the conductor.

C. type of material.

D. none of these.

184. If holding current of a thyristor is 2 mA then latching current should be_____?
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A. 0.009 A.

B. 0.01 A.

C. 0.002 A.

D. 0.004 A.
185. Number of PN junction in an SCR is____________?
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A. Four

B. Five

C. Three

D. Two

186. The most suited gate pulses given to the AC regulator with R L load can be in the form of____________?
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A. A train of pulses

B. Continuous signal

C. Large isolating pulse transformer

D. None of these

187. BCT is used for____________?
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A. Low power phase control

B. Low power current control

C. High power current control

D. High power phase control
188. The output current in PWM DC DC converters is equal to___________?
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A. Product of an average inductor current and a function of duty ratio

B. Either A. or B.

C. Average value of the output inductor current

D. None of these

189. In constant frequency PWM, at perturbation the amplitude of the sinusoidal component is a___________?
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A. None of these

B. Linear function

C. Constant function

D. Non linear function

190. Voltage dependent resistors are usually made from________________?
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A. Silicon Carbide

B. Nichrome

C. Graphite

D. Charcoal

191. When electric current passes through a bucket full of water, lot of bubbling is observeD. This suggests that the type of supply is____________?
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A. none of the above

B. D. C.

C. A. C.

D. any of above two

192. No-load on a transformer is carried out to determine______________?
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A. magnetising current and loss

B. copper loss

C. efficiency of the transformer

D. magnetising current

193. The condition for the validity under Ohms law is that_______________?
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A. current should be proportional to the size of the resistance

B. resistance must be wire wound type

C. resistance must be uniform

D. temperature at positive end should be more than the temperature at negative end

194. All good conductors have high____________?
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A. thermal conductivity

B. reluctance

C. conductance

D. resistance

195. The curve between V and I of SCR when anode is positive w.r.t cathode and when anode is negative w.r.t cathode are known as_____________________?
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A. both as forward characteristics

B. both as reverse characteristics

C. former as forward characteristics and later as reverse characteristics

D. former as reverse characteristics and later as forward characteristics

196. A rheostat differs from potentiometer in the respect that it_____________?
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A. has lower wattage rating

B. has higher wattage rating

C. has large number of turns

D. offers large number of tapping

197. It becomes more difficult to remove_________________?
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A. third electron from the orbit

B. any electron from the orbit

C. first electron from the orbit

D. second electron from the orbit

198. The Graetz bridge makes excellent use of ______________?
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A. Potential transformer

B. Power transformer

C. Current transformer

D. SCR

199. Two bulbs of 500 W and 200 W rated at 250 V will have resistance ratio as________?
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A. 5:02

B. 25:04:00

C. 2 : 5

D. 4:25

200. The filament of an electric bulb is made of______________?
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A. tungsten

B. aluminium

C. carbon

D. nickel