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
2801. In a D.C. machine the number of brush arms is _________ the number of poles?
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A. equal to

B. less than

C. greater than

D. none of the above

2802. A monostable vibrator has_____________
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A. Two stable states

B. One stable state

C. No stable state

D. None of the above

2803. To send 10% of the main current through a moving coil galvanometer of resistance 99 O the shunt required is______________?
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A. 11 O

B. 100 O

C. 9 O

D. 9 O

2804. In a certain common-source D-MOSFET amplifier, Vds =3.2 V r.m. and Vgs = 280 mV r.m.s. The voltage gain is_______________?
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A. 1

B. 11.4

C. 3.2

D. 8.75

2805. A n-channel D-MOSFET with a positive VGS is operating in _______________?
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A. cut off

B. saturation

C. the enhancement-mode

D. the depletion-mode

2806. The cylindrical windings using circular conductors are used for current rating of____________?
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A. upto 40 A

B. upto 60 A

C. upto 80 A

D. upto 20 A

2807. Power transformers should be designed to have maximum efficiency________________?
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A. any of the above

B. at one-half load

C. at or near full load

D. at one-fourth load

2808. A switch has ______________?
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A. Two states

B. One state

C. None of the above

D. Three states

2809. When the two coil sides forming a coil are spaced exactly one pole pitch apart they are said to be of_____________?
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A. short pitch

B. either of the above

C. full pitch

D. none of the above

2810. The heated parts of an electrical machine dissipate heat into their surroundings by which of the following modes of heat dissipation ?
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A. Conduction

B. Radiation

C. All of the above

D. Convection

2811. When the transistor (CE arrangement) is in the cut off region, the collector current is ______________?
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A. ICBO

B. ICEO

C. IC(sat)

D. ( + 1) ICEO

2812. The sensitivity of a voltmeter which uses a 100 A meter movement is ____________?
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A. Data insufficient

B. 10 kO/V

C. 1 kO/V

D. 5 kO/V

2813. Which of the following in an application of D.C. motors?
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A. Automatic control

B. Drives for process industry

C. All of the above

D. Traction

E. Battery driven vehicles

2814. The distance between the starts of two consecutive coils measured in terms of coil sides is called_____________?
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A. commutator pitch

B. back pitch

C. front pitch

D. winding pitch
2815. The input impedance of a MOSFET is of the order of______________?
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A. kO

B. O

C. several MO

D. a few hundred O

2816. A JFET is a__________ driven device?
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A. current

B. voltage

C. both current and voltage

D. none of the above

2817. Which of the following brushes can be used for high values of current density ?
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A. Hard carbon brushes

B. Natural graphite brushes

C. Electro-graphitic brushes

D. Metal graphite brushes
2818. The design of electromagnets is based upon which of the following fundamental equations ?
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A. Force equation

B. Voltage equation

C. Magnetic circuit equation

D. All of the above

E. Heating equation

2819. A Zener regulator _____________ in the power supply?
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A. Increases the ripple

B. Decreases the ripple

C. Neither increases nor decreases the ripple

D. Data insufficient

2820. An ideal ammeter has ______________ resistance?
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A. High

B. Infinite

C. Low

D. Zero
2821. The thermal conductivity of hydrogen is _____________ times that of air?
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A. 2

B. 5

C. 3

D. 7
2822. The most accurate device for measuring voltage is ____________?
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A. Multimeter

B. VTVM

C. CRO

D. Voltmeter

2823. With conventional hydrogen cooling it is possible to increase the rating of a single unit to___________?
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A. 200 MW

B. none of the above

C. 50 MW

D. 100 MW

2824. A JFET has high input impedance because _________________?
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A. none of the above

B. of impurity atoms

C. it is made of semiconductor material

D. input is reverse biased
2825. For VGS = 0 V, the drain current becomes constant when VDS exceeds ________________?
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A. VDD

B. V

C. VP

D. cut off

2826. If the load current drawn by unregulated power supply increases, the d.c. output voltage _____________?
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A. Stays the same

B. Increases

C. Decreases

D. None of the above

2827. A CS JFET amplifier has a load resistance of 10 kO , RD= 820O . If gm= 5mS and Vin= 500 mV, the output signal voltage is__________________?
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A. 2.05 V

B. 1.89 V

C. 25 V

D. 0.5 V

2828. A VTVM has_____________input resistance than that of a multi meter?
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A. Less

B. More

C. None of the above

D. Same

2829. The stator of a D.C. machine comprises of_____________?
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A. all of the above

B. main poles

C. interpoles

D. frame

2830. A certain common-source JFET has a voltage gain of 10. If the source bypass capacitor is removed, ______________?
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A. the voltage gain will increase

B. the voltage gain will decrease

C. the Q-point will shift

D. the transconductance will increase

2831. If the input to a differentiating circuit is a saw-tooth wave, then output will be _____________?
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A. Square

B. Sine

C. Rectangular

D. Triangular

2832. The value of exciting or magnetizing current depends upon which of the following factors ?
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A. All of the above

B. The number of turns in the exciting winding

C. Total m.m.f. required

D. The way in which the winding is distributed

2833. In D.C. machines, the ________ in field mmf results in increase in size and cost of machines?
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A. either of the above

B. decrease

C. increase

D. none of the above

2834. For increasing the voltage rating, zeners are connected in_____________?
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A. Series

B. None of the above

C. Parallel

D. Series-parallel

2835. A certain D-MOSFET is biased at VGS = 0 V. Its data sheet specifies IDSS = 20mA and VGS(off) = -5 V. The value of the drain current is _____________?
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A. 20 mA

B. 0 mA

C. 40 mA

D. 10 mA

2836. D.C. windings are____________?
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A. sometimes 2-layer type

B. always 2-layer type

C. never 2-layer type

D. none of the above

2837. If the doping level is increased, the breakdown voltage of the Zener_______________?
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A. Is increased

B. Remains the same

C. None of the above

D. Is decreased
2838. Which of these is the best description for a Zener diode ?
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A. It works in the forward region

B. It is a diode

C. It is a constant-voltage device

D. It is a constant current device

2839. A differentiating circuit is a simple RC circuit with output taken across ____________?
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A. R

B. C

C. Both R and C

D. None of the above

2840. Operational amplifiers use ________________?
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A. Linear ICs

B. Digital ICs

C. Both linear and digital ICs

D. None of the above

2841. The materil used to coat inside the face of CRT is ______________?
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A. Phosphorous

B. Carbon

C. Silicon

D. Sulphur

2842. A MOSFET differs from a JFET mainly because _________________?
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A. of power rating

B. the JFET has a pn junction

C. the MOSFET has two gates

D. none of the above

2843. A 30 V Zener will have depletion layer width_______________ that of 10 V Zener?
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A. Equal to

B. More than

C. None of the above

D. Less than

2844. ____________are always double layer type?
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A. Open windings

B. Closed windings

C. Either of the above

D. None of the above

2845. The surge phenomenon is particularly important in case of_______________?
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A. low voltage transformers

B. high voltage transformers

C. medium voltage transformers

D. any of the above

2846. If a square wave is fed to a differentiating circuit, the output will be _____________?
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A. Triangular wave

B. Sine wave

C. Sharp narrow pulses

D. Rectangular wave

2847. Tractive magnets are operated from____________?
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A. either a.c. or d.c. supply

B. a.c. supply

C. none of the above</strong>

D. d.c. supply

2848. The mcrease in heat dissipation by air blasts is due to increase in______________?
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A. conduction

B. any ofthe above

C. convection

D. radiation

2849. For display of signal pattern _____________voltage is applied to the horizontal plates of a CRO?
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A. Rectangular

B. Sinusoidal

C. Sawtooth

D. None of the above

2850. Two similar 15 V Zeners are connected in series. What is the regulated output voltage ?
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A. 30 V

B. 5 V

C. 45 V

D. 15 V