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
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

3161. Regenerative feedback implies feedback with_______________?
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A. oscillations

B. step input

C. positive sign

D. negative sign

3162. A signal other than the reference input that tends to affect the value of controlled variable is known as_________________?
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A. command

B. disturbance

C. control element

D. reference input

3163. E.m.f. of a Weston cell is accurately measured by________________?
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A. electrodynamic voltmeter

B. isothermal voltmeter

C. electrostatic voltmeter

D. hot wire voltmeter

3164. The phase lag produced by transportation relays_____________?
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A. is independent of frequency

B. decreases linearly with frequency

C. increases linearly with frequency

D. is inversehproportional to frequency

3165. Instrument transformers are_______________?
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A. potential transformers

B. current transformers

C. both A. and B.

D. power transformers

3166. The rectifier instrument is not free from_______________?
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A. wave shape error

B. all of the above

C. temperature error

D. frequency error
3167. An automatic toaster is a ___________ loop control system?
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A. closed

B. any of the above

C. partially closed

D. open
3168. In a control system integral error compensation _________________ steady state error?
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A. increases

B. any of the above

C. minimizes

D. does not have any effect on

3169. Wattmeter cannot be designed on the principle of_________________?
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A. electrostatic instrument

B. moving iron instrument

C. electrodynamic instrument

D. thermocouple instrument

3170. Alternating current is measured by_______________?
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A. induction ammeter

B. permanent magnet type ammeter

C. moving iron repulsion type voltmeter

D. electrostatic ammeter

3171. A control system working under unknown random actions is called______________?
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A. adaptive control system

B. digital data system

C. stochastic control system

D. computer control system

3172. In a system zero initial condition means that______________?
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A. The system is at rest and no energy is stored in any of its components

B. The system is working with zero reference signal

C. The system is working with zero stored energy

3173. For measurement of mutual inductance we can use________________?
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A. Heaviside bridge

B. Anderson bridge

C. Maxwells bridge

D. Any of the above

3174. For handling greater currents induction wattmeters are used in conjunction with______________?
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A. none of the above

B. potential transformers

C. power transformers

D. either of the above

E. current transformers
3175. For measuring current at high frequency we should use_______________?
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A. thermocouple instrument

B. electrostatic instrument

C. moving iron instrument

D. none of the above

3176. Transfer function of a system is used to calculate which of the following ?
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A. The order of the system

B. The time constant

C. The output for any given input

D. The steady state gain

3177. A conditionally stable system exhibits poor stability at______________?
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A. low frequencies

B. increased values of open loop gain

C. none of the above

D. reduced values of open loop gain
3178. Various adjustments in an energy meter include_______________?
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A. overload and voltage compensation

B. temperature compensation

C. light load or friction

D. lag and creep

E. all of the above
3179. Which of the following should be done to make an unstable system stable ?
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A. The number of zeros to the loop transfer function should be increased

B. The number of poles to the loop transfer function should be increased

C. The gain of the system should be increased

D. The gain of the system should be decreased

3180. Which of the following statements is not necessarily correct for open control system ?
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A. Input command is the sole factor responsible for providing the control action

B. Presence of non-linearities causes malfunctioning

C. Less expensive

D. Generally free from problems of non-linearities

3181. _____________is the reference input minus the primary feedback?
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A. Zero sequence

B. Manipulated variable

C. Primary feedback

D. Actuating signal
3182. As a result of introduction of negative feedback which of the following will not decrease ?
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A. Band width

B. Distortion

C. Overall gain

D. Instability

3183. Main traction systems used in India are, those using______________?
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A. all of the above

B. steam engine locomotives

C. diesel engine locomotives

D. diesel electric locomotives

E. electric locomotives

3184. If the feedback resistor in Q15 (above question) is open, the voltage gain ____________?
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A. depends on Ri

B. increases

C. is not affected

D. decreases

3185. The resistance in the circuit of the moving coil of a dynamometer wattmeter should be_____________?
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A. low

B. almost zero

C. high

D. none of the above

3186. In a 3-phase power measurement by two wattmeter method, both the watt meters had identical readings. The power factor of the load was___________?
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A. unity

B. zero

C. 0.8 lagging

D. 0.8 leading

3187. The disc of an instrument using eddy current damping should be of________________?
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A. conducting and non-magnetic material

B. none of the above

C. non-conducting and magnetic material

D. conducting and magnetic material

3188. According to application, instruments are classified as_____________?
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A. switch board

B. portable

C. both A. and B.

D. moving coil

E. moving iron

F. both D. and E.

3189. In an energy meter braking torque is produced to________________?
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A. bring energy meter to stand still

B. safe guard it against creep

C. maintain steady speed and equal to driving torque

D. brake the instrument

3190. The transfer function is applicable to which of the following ?
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A. Linear and time-in variant systems

B. Non-linear systems

C. None of the above

D. Linear and time-variant systems

E. Linear systems

3191. Which of the following is the non-linearity caused by servomotor ?
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A. Backlash

B. None of the above

C. Static friction

D. Saturation
3192. Which of the following is the output of a thermocouple ?
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A. None of the above

B. Alternating current

C. A.C. voltage

D. D.C. voltage

E. Direct current

3193. Most common form of A.C. meters met with in every day domestic and industrial installations are______________?
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A. all of the above

B. commutator motor meters

C. induction type single phase energy meters

D. mercury motor meters

3194. In thermal-electrical analogy charge is considered analogous to_______________?
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A. none of the above

B. heat flow

C. reciprocal of temperature

D. temperature

E. reciprocal of heat flow

3195. The node voltage at the top of the til resistor is closes to________________?
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A. emitter supply voltage

B. collector supply voltage

C. tail current times base resistance

D. zero
3196. The pointer of an indicating instrument should be______________?
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A. neither A. nor B.

B. very light

C. either A. or B.

D. very heavy

3197. Due to which of the following reasons excessive bond width in control systems should be avoided ?
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A. It leads to low relative stability

B. It leads to slow speed of response

C. Noise is proportional to band width

D. None of the above

3198. has tendency to oscillate______________?
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A. Open loop system

B. Closed loop system

C. Both A. and B.

D. Neither A. nor B.

3199. Commonly used standard capacitor is______________?
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A. multilayer parallel plate type

B. concentric cylindrical type

C. electrostatic type

D. spherical type

3200. The NOR gate is OR gate followed by____________________?
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A. NAND gate

B. None of the above

C. NOT gate

D. AND gate