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
3051. Of the values listed, the most realistic value for open-loop voltage gain of an OP-amp is________________?
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A. 1

B. 100,000

C. 2000

D. 80 dB

3052. A certain OP-amp has bias currents of 50 A. The input offset current is_________________?
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A. 99.3 A

B. 49.7 A

C. none of these

D. 700 nA
3053. In a dynamometer 3-phase power factor meter, the planes of the two moving coils are at_____________?
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A. 0

B. 60

C. 90

D. 120
3054. The band width, in a feedback amplifier_______________?
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A. increases by the sane saaaajajt as the gain decrease

B. decreases by the same amount as the gain increase

C. remains unaffected

D. decreases by the same amount as the gain decrease

3055. Which of the following is the best method for determining the stability and transient response ?
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A. Nyquist plot

B. None of the above

C. Root locus

D. Bode plot

3056. A control system in which the control action is somehow dependent on the output is known as____________?
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A. Open system

B. Semiclosed loop system

C. None of the above

D. Closed loop system
3057. A direct current can be measured by________________?
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A. none of the above

B. a D.C. potentiometer in conjunction with a standard resistance

C. a D.C. potentiometer directly

D. a D.C. potentiometer in conjunction with a volt ratio box

3058. For measurements on high voltage capacitors, the suitable bridge is_______________?
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A. Schering bridge

B. None of the above

C. Any of the above

D. Wein bridge

E. Modified De Santys bridge

3059. A phase shifting transformer is used in conjunction with_______________?
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A. A.C. co-ordinate potentiometer

B. Drysdale potentiometer

C. Crompton potentiometer

D. D.C. potentiometer

3060. The switch board instruments________________?
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A. should be mounted in vertical position

B. either A. or B.

C. neither A. nor B.

D. should be mounted in horizontal position

3061. A voltage of about 200 V can be measured__________________?
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A. none of the above

B. a D.C. potentiometer in conjunction with a known resistance

C. directly by a D.C. potentiometer

D. a D.C. potentiometer in conjunction with a volt ratio box
3062. With feedback __________ increases?
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A. sensitivity

B. effects of disturbing signals

C. system stability

D. gain

3063. Resistances can be measured with the help of_______________?
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A. wattmeters

B. voltmeters

C. ohmmeters and resistance bridges

D. ammeters

E. all of the above

3064. A moving-coil permanent-magnet instrument can be used as ____________by using a low resistance shunt?
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A. flux-meter

B. ammeter

C. voltmeter

D. ballistic galvanometer

3065. Mass, in force-voltage analogy, is analogous to________________?
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A. resistance

B. inductance

C. charge

D. current

3066. Velocity error constant of a system is measured when the input to the system is unit ___________ function?
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A. impulse

B. ramp

C. parabolic

D. step

3067. In liquid level and electrical system analogy, voltage is considered analogous to_____________?
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A. liquid flow

B. none of the above

C. head

D. liquid flow rate

3068. If the current in a capacitor leads the voltage by 80, the loss angle of the capacitor is_________________?
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A. 120

B. 10

C. 80

D. 170

3069. A.C. servomotor resembles_____________?
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A. direct current series motor

B. universal motor

C. Three phase induction motor

D. two phase induction motor
3070. Negative feedback_______________?
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A. increases the input and output impedances

B. increases the input impedance and bandwidth

C. decreases the output impedance and bandwidth

D. does not affect impedance or bandwidth

3071. For diesel locomotives the range of horsepower is_______________?
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A. 1500 to 2500

B. 500 to 1000

C. 50 to 200

D. 3000 to 5000

3072. In a vibrating reed frequency meter the natural frequencies of two adjacent reeds have a difference of___________?
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A. 0.1 Hz

B. 0.5 Hz

C. 0.25 Hz

D. 1.5 Hz

3073. ____________is a part of the human temperature control system?
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A. Digestive system

B. Perspiration system

C. Leg movement

D. Ear

3074. A common-mode signal is applied to ________________?
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A. the noninverting input

B. the inverting input

C. both iputs

D. top of the tail resistor

3075. A Weston frequency meter is_____________?
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A. dynamometer instrument

B. moving coil instrument

C. none of the above

D. moving iron instrument
3076. With feed back __________ reduces?
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A. system stability and gain

B. system stability

C. system gain

D. none of the above

3077. The speed of a locomotive is controlled by_______________?
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A. regulating steam flow to engine

B. gear box

C. applying brakes 11.

D. flywheel

3078. The scale of a rectifier instrument is_________________?
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A. neither A. nor B.

B. either A. or B.

C. non-linear

D. linear
3079. A potentiometer may be used for_________________?
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A. all of the above

B. calibration of ammeter

C. measurement of resistance

D. calibration of voltmeter

E. measurement of current

3080. The operating voltage of a meggar is about_______________?
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A. 6 V

B. 100 V

C. 40 V

D. 12 V

3081. _______________is a closed loop system?
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A. Car starter

B. Electric switch

C. Direct current generator

D. Auto-pilot for an aircraft
3082. Pressure error can be measured by which of the following ?
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A. Differential bellows and straingauge

B. Strain gauge

C. Strain gauge and potentiometer

D. Selsyn

3083. The desirable static characteristics of a measuring system are______________?
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A. accuracy and reproducibility

B. static error

C. drift and dead zone

D. accuracy, sensitivity and reproducibility
3084. Which of the following statements is correct for a system with gain margin close to unity or a phase margin close to zero ?
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A. None of the above

B. The system is highly oscillatory

C. The system is highly stable

D. The system is relatively stable

3085. The function of shunt in an ammeter is to______________?
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A. increase the resistance of ammeter

B. by pass the current

C. none of the above

D. increase the sensitivity of the ammeter

3086. In a Schering bridge the potential of the detector above earth potential is______________?
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A. 10 kV

B. a few volts only

C. 5 kV

D. 1 kV

3087. _____________is not a final control element?
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A. Control valve

B. Electropneumatic converter

C. Servomotor

D. Potentiometer
3088. Which of the following statements is correct for any closed loop system ?
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A. Only one of the static error co-efficients has a finite non-zero value

B. None of the above

C. All the co-efficients can have zero value

D. All the co-efficients are always non-zero

3089. __________ instruments are those which measure the total quantity of electricity delivered in a particular time ?
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A. Integrating

B. Absolute

C. Recording

D. Indicating

3090. technique gives quick transient and stability response______________?
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A. Bode

B. Root locus

C. Nichols

D. Nyquist

3091. Which of the following properties a damping oil must possess ?
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A. Should not have corrosive action upon the metal of the vane

B. Should be non-evaporating

C. All of the above

D. The viscosity of the oil should not change with the temperature

E. Must be a good insulator

3092. A differentiator is usually not a part of a control system because it______________?
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A. reduces the gain margin

B. reduces damping

C. increases error

D. increases input noise
3093. To measure a resistance with the help of a potentiometer it is_________________?
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A. necessary to use a volt ratio box in conjunction with the potentiometer

B. none of the above

C. not necessary to standardise the potentiometer

D. necessary to standardise the potentiometer

3094. A __________ device prevents the oscillation of the moving system and enables the latter to reach its final position quickly___________?
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A. deflecting

B. damping

C. any of the above

D. controlling

3095. In a stable control system backlash can cause which of the following ?
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A. Underdamping

B. Low-level oscillations

C. Poor stability at reduced values of open loop gain

D. Overdamping

3096. The differential gain is _____________?
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A. about 100

B. very low

C. dependent on input voltage

D. very high
3097. The output of a feedback control system must be a function of_________________?
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A. reference and output

B. input and feedback signal

C. output and feedback signal

D. reference and input

3098. The principle on which vector voltmeter is based is_____________?
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A. that it measures the response of linear ramp voltage

B. that it works on the principle of complex variation

C. that it measures the amplitude of a single at two points and at the same time measures their phase difference

D. same as digital meter

3099. The gravity controlled instrument has crowded scale because current is proportional to________________?
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A. balancing weight

B. deflection angle

C. sine of deflection angle
3100. When the initial conditions of a system are specified to be zero it implies that the system is______________?
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A. working normally with zero reference input

B. at rest without any energy stored in it

C. at rest but stores energy

D. working normally with reference input