electrical engineering MCQs – Page 158

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 Review each marked answer and report any item that may be outdated or unclear.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
3141. In a low power factor wattmeter the compensating coil is connected_______________?
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A. in series with current coil

B. in series with pressure coil

C. in parallel with current coil

D. in parallel with pressure coil

3142. ______________By which of the following the system response can be tested better ?
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A. Sinusoidal input signal

B. Ramp input signal

C. Exponentially decaying signal

D. Unit impulse input signal
3143. A moving-coil permanent-magnet instrument can be used as flux-meter_____________?
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A. by eliminating the control springs

B. by using a low resistance shunt

C. by making control springs of large moment of inertia

D. by using a high series resistance

3144. In a meggar controlling torque is provided by______________?
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A. coil

B. spring

C. gravity

D. eddy current

3145. In a 3-phase power measurement by two wattmeter method the reading of one of the wattmeter was zero. The power factor of the load must be_______________?
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A. unity

B. zero

C. 0.3

D. 0.5
3146. The effect of error damping is to______________?
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A. delay the response

B. any of the above

C. provide larger settling lime

D. reduce steady state error

E. none of the above

3147. If an inductance is connected in one arm of bridge and resistances in the remaining three arms____________?
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A. the bridge cannot be balanced

B. the bridge can be balanced if the resistances have some specific values

C. the bridge can always be balanced

3148. Static error coefficients are used as a measure of the effectiveness of closed loop systems for specified ___________ input signal?
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A. position

B. acceleration

C. velocity

D. all of the above
3149. The input offset current equals the_____________?
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A. difference between two base currents

B. average of two base currents

C. none of these

D. collector current divided by current gain

3150. The overall efficiency of steam locomotive is around_____________?
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A. 15 to 20 percent

B. 25 to 35 percent

C. 5 to 10 percent

D. 35 to 45 percent

3151. The common-mode voltage gain is________________?
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A. smaller than differentail voltage gain

B. greater than differential voltage gain

C. equal to differential voltage gain

D. none of the above

3152. The power of a n-phase circuit can be measured by using a minimum of_______________?
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A. (n 1) wattmeter elements

B. n wattmeter elements

C. 2n wattmeter elements

D. (n + 1) wattmeter elements

3153. A closed loop system is distinguished from open loop system by which of the following ?
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A. Output pattern

B. Feedback

C. Input pattern

D. Servomechanism

3154. If ADM = 3500 and ACM = 0.35, the CMRR is _______________?
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A. 80 dB

B. answers (A) and (B)

C. 10,000

D. 1225

3155. Murray loop test can be used for location of________________?
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A. ground fault on a cable

B. short circuit fault on a cable

C. both the ground fault and the short-circuit fault

D. none of the above

3156. The input stage of an Op-amp is usually a ________________?
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A. swamped amplifier

B. class B push-pull amplifier

C. differential amplifier

D. CE amplifier

3157. The use of negative feedback ________________?
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A. makes the Op-amp oscillate

B. answers (A) and (B)

C. reduces the voltage gain of an Op-amp

D. makes linear operation possible

3158. Which of the following meters are not used on D.C. circuits______________?
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A. Commutator motor meters

B. Induction meters

C. Mercury motor meters

D. None of the above

3159. An ammeter is a______________?
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A. integrating instrument

B. recording instrument

C. secondary instrument

D. absolute instrument

3160. The type 0 system has ___________ at the origin?
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A. no pole

B. none of the above

C. two poles

D. simple pole

E. net pole