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
2951. In open loop system_____________?
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A. the control action depends on the size of the system

B. the control action depends on system variables

C. the control action depends on the input signal

D. the control action is independent of the output
2952. Phase margin of a system is used to specify which of the following ?
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A. Time response

B. Frequency response

C. Absolute stability

D. Relative stability
2953. To measure radio frequency, the suitable frequency meter is_______________?
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A. electrical resonance frequency meter

B. heterodoxy frequency meter

C. Weston frequency meter

D. reed vibrator frequency meter

2954. The tail current of a differential amplifier is_______________?
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A. equal to the difference in base currents

B. equal to either collector current

C. half of either collector current

D. two times either collector current
2955. A power factor meter has________________?
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A. two current circuits and one pressure circuit

B. one current circuit and two pressure circuits

C. none of the above

D. one current circuit and one pressure circuit

2956. The adjustment of position of shading bands, in an energy meter is done to provide______________?
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A. creep compensation

B. friction compensation

C. none of the above

D. braking torque

2957. In electrical-pneumatic system analogy the current is considered analogous to_____________?
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A. air flow

B. velocity

C. pressure

D. air flow rate
2958. The electrical power to a meggar is provided by________________?
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A. battery

B. any of the above

C. permanent magnet D.C. generator

D. AC. generator

2959. An ohmmeter is a____________?
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A. moving iron instrument

B. dynamometer instrument

C. none of the above

D. moving coil instrument
2960. signal will become zero when the feedback signal and reference signs are equal?
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A. Reference

B. Feedback

C. Actuating

D. Input

2961. The stator of phase shifting transformer for use in conjunction with an A.C. potentiometer usually has a _________________?
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A. single-phase winding

B. any of the above

C. two-phase winding

D. three-phase winding

2962. A multirangq instrument has________________?
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A. multiple shunt or series resistances inside the meter

B. multicoii arrangement

C. variable turns of coil

D. any of the above

E. multi range meters inside the measurement system

2963. A good control system has all the following features except_____________?
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A. good accuracy

B. good stability

C. slow response

D. sufficient power handling capacity

2964. Damping of the Ballistic galvanometer is made small to_______________?
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A. get minimum overshoot

B. make the system oscillatory

C. get first deflection large

D. make the system critically damped

2965. The tail current in a differential amplifier equals ______________?
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A. collector voltage divided by collector resistance

B. sum of two emitter currents

C. collector current divided by current gain

D. difference between two emitter currents

2966. The Op-amp can amplify______________?
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A. a.c. signals only

B. d.c. signals only

C. both a.c. and d.c. signals

D. neither d.c. nor a.c. signals

2967. In a Weston synchronoscope, the fixed coils are connected across_______________?
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A. bus-bars

B. none of the above

C. a lamp

D. incoming alternator
2968. The pressure coil of a wattmeter should be connected on the supply side of the current coil when______________?
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A. load impedance is low

B. load impedance is high

C. none of the above

D. supply voltage is low

2969. The second derivative input signals modify which of the following ?
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A. The time constant and suppress the oscillations

B. The time constant of the system

C. None of the above

D. Damping of the system

E. The gain of the system

2970. In a control system the output of the controller is given to_____________?
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A. none of the above

B. sensor

C. comparator

D. amplifier

E. final control element
2971. The common-mode voltage gain of a differential amplifier is equal to RC divided by _______________?
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A. re/2

B. 2RE

C. 2re

D. re

2972. Which of the following is the definition of proportional band of a controller ?
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A. None of the above

B. The range of air output as measured variable varies from maximum to minimum

C. The range of measured variables through which the air output changes from maximum to minimum

D. Any of the above

E. The range of measured variables from set value

2973. Standard resistor is made from_________________?
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A. maganin

B. nichrome

C. platinum

D. silver

2974. _______________is an open loop control system?
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A. Field controlled D.C. motor

B. Stroboscope

C. Ward Leonard control

D. Metadyne

2975. The output of a particular Op-amp increases 8V in 12s. The slew rate is_______________?
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A. none of these

B. 90 V/s

C. 1.5 V/s

D. 0.67 V/s
2976. Commonly used instruments in power system measurement are_______________?
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A. moving coil or iron

B. electrostatic

C. rectifier

D. induction
2977. The viscous friction co-efficient, in force-voltage analogy, is analogous to______________?
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A. reciprocal of conductance

B. none of the above

C. charge

D. reciprocal of inductance

E. resistance
2978. Which of the following essential features is possessed by an indicating instrument?
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A. Deflecting device

B. Damping device

C. All of the above

D. Controlling device

2979. Zero initial condition for a system means_______________?
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A. system is at rest and no energy is stored in any of its components

B. input reference signal is zero

C. zero stored energy

D. ne initial movement of moving parts

2980. Which of the following devices should be used for accurate measurement of low D.C. voltage ?
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A. None of the above

B. Small range thermocouple voltmeter

C. D.C. potentiometer

D. Small range moving coil voltmeter

2981. If a step function is applied to the input of a system and the output remains below a certain level for all the time, the system is_____________?
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A. stable

B. always unstable

C. any of the above

D. unstable

E. not necessarily stable
2982. In closed loop control system, with positive value of feedback gain the overall gain of the system will______________?
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A. increase

B. any of the above

C. decrease

D. be unaffected

2983. To avoid the effect of stray magnetic field in A.C. bridges we can use_______________?
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A. magnetic screening

B. Wagner earthing device

C. any of the above

D. wave filters

2984. In Weston synchronoscope the moving coil is connected across______________?
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A. bus-bars

B. fixed coils

C. any of the above

D. incoming alternator

2985. The two pressure coils of a single phase power factor meter have_________________?
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A. the same number of turns but different dimensions

B. the same dimensions and the same number of turns

C. the same dimension but different number of turns

D. none of the above

2986. increases the steady state accuracy?
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A. Phase lag compensator

B. Integrator

C. Differentiator

D. Phase lead compensator

2987. A differential amplifier______________?
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A. has one input and one output

B. has two outputs

C. is a part of an Op-amp

D. answers (A) and (B)
2988. If an instrument has cramped scale for larger values, then it follows________________?
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A. uniform law

B. logarithmic law

C. none of the above

D. square law

2989. 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. 1.5 Hz

D. 0.25 Hz

2990. The use of _________ instruments is merely confined within laboratories as standardizing instruments?
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A. none of the above

B. recording

C. indicating

D. integrating

E. absolute
2991. Which of the following devices may be used for extending the range of instruments ?
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A. Potential transformers

B. Current transformers

C. All of the above

D. Multipliers

E. Shunts

2992. The transfer function technique is considered as inadequate under which of the following conditions ?
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A. Systems having multiple input disturbances

B. Systems having stability problems

C. Systems having complexities and non-linearities

D. All of the above
2993. The multiplier and the meter coil in a voltmeter are in________________?
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A. parallel

B. series

C. none of the above

D. series-parallel

2994. Which of the following essential features is possessed by an indicating instrument ?
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A. All of the above

B. Deflecting device

C. Controlling device

D. Damping device

2995. In order to increase the damping of a badly underdamped system which of following compensators may be used ?
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A. Phase-lead

B. Phase-lag

C. Both A. and B.

D. Either A. and B.

E. None of the above

2996. Which of the following devices is used for conversion of co-ordinates ?
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A. Synchro-resolver

B. Microsyn

C. Synchro-transformer

D. Selsyn

2997. A certain noninverting amplifier has Ri of 1 kO and Rf of 100 kO. The closed-loop voltage gain is_____________?
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A. 100

B. 1000

C. 100,000

D. 101
2998. The horsepower of steam locomotives is______________?
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A. up to 1500

B. 3000 to 4000

C. 1500 to 2000

D. 2000 to 3000

2999. ___________From which of the following transfer function can be obtained ?
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A. None of the above

B. Signal flow graph

C. Standard block system

D. Output-input ratio

E. Analogous table

3000. Spring constant in force-voltage analogy is analogous to_____________?
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A. reciprocal of capacitance

B. resistance

C. current

D. capacitance