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
2851. Transformers with a capacity of up to __________ have a cooling radiator system with natural cooling?
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A. 7.5 MVA

B. 10 MVA

C. 2 MVA

D. 5 MVA

2852. Which of the following is the commonly used type of electromagnets ?
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A. Flat-faced armature type

B. All of the above

C. Horse shoe type

D. Flat-faced plunger type

2853. An ideal regulated power supply is one which has voltage regulation of________________?
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A. 10%

B. 0%

C. 5%

D. 1%

2854. The output characteristics of a JFET closely resemble the output characteristics of a ___________ valve?
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A. diode

B. pentode

C. tetrode

D. triode

2855. We use _____________ ICs in computers?
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A. Digital

B. Linear

C. Both digital and linear

D. None of the above

2856. The pinch-off voltage in a JFET is analogous to _____________ voltage in a vacuum tube?
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A. cathode

B. grid cut off

C. none of the above

D. anode

2857. What is true about the breakdown voltage in a Zener diode ?
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A. It destroys the diode

B. It equals current times the resistance

C. It is approximately constant

D. It decreases when load current increases

2858. D.C. machines designed with a large value of air gap length have_____________?
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A. worst, ventilation

B. none of the above

C. better ventilation

D. poor ventilation

2859. The Zener current will be minimum when_____________?
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A. None of the above

B. Load current is zero

C. Load current is minimum

D. Load current is maximum
2860. In a FET, there are _____________pn junctions at the sides?
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A. five

B. three

C. two

D. four

2861. Power transformers have rating_______________?
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A. above 200 kVA

B. equal to 50 kVA

C. equal to 100 kVA

D. none of the above

2862. An ammeter is connected in __________ with the circuit element whose current we wish to measure?
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A. Series or parallel

B. Parallel

C. Series

D. None of the above

2863. In an unregulated power supply, if input a.c. voltage increases, the output voltage _______________?
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A. Increases

B. Remains the same

C. None of the above

D. Decreases

2864. Digital ICs process______________?
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A. Linear signals only

B. Digital signals only

C. Both digital and linear signals

D. None of the above

2865. Direct water cooling of rotor winding presents_____________?
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A. no mechanical difficulties

B. greater mechanical difficulties

C. none of the above

D. lesser mechanical difficulties

2866. Commercial power supplies have voltage regulation ______________?
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A. within 1%

B. of 15%

C. of 25%

D. of 10%

2867. At cut-off, the JFET channel is _____________?
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A. extremely narrow

B. reverse baised

C. at its widest point

D. completely closed by the depletion region
2868. The insulation between windings and grounded core and the insulation between the windings of the same phase is called__________________?
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A. major insulation

B. either of the above

C. none of the above

D. minor insulation

2869. ____________are used for construction of core of electromagnets?
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A. Either A. or B.

B. Soft magnetic materials

C. Hard magnetic materials

D. None of the above

2870. ____________ is the common method of applying brushes to the commntator?
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A. Reaction

B. Trailing

C. All of the above

D. Radial

2871. The laminations of the armature of a D.C. machine are usually ___________ thick?
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A. 0.4 to 0.5 mm

B. 0.2 to 0.3 mm

C. 0.1 to 0.2 mm

D. 0.3 to 0.4 mm

2872. If the cross-sectional area of the channel in n-channel JEFT increases, the drain current _____________?
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A. is increased

B. remains the same

C. none of the above

D. is decreased

2873. The positive clipper is that which removes the ____________half-cycles of the input voltage?
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A. Negative

B. Positive

C. Both positive and negative

D. None of the above

2874. In D.C. machines the width of the duct is usually_____________?
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A. 4 mm

B. 10 mm

C. 6 mm

D. 8 mm

2875. The flash point of transformer oil should be higher than_______________?
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A. 40C

B. 104C

C. 80C

D. 60C

2876. Which of the following methods may be adopted to reduce the effects of armature reaction ?
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A. Increasing reluctance of pole tips

B. Compensating windings

C. All of the above

D. Increase in length of air gap at pole tips

E. Interpoles

2877. The main disadvantage of a mechanical switch is that it_______________?
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A. Has high inertia

B. Is operated mechanically

C. Is costly

D. None of the above

2878. In a 15 V Zener diode , the breakdown mechanism will occur by ______________?
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A. Avalanche mechanism

B. Zener mechanism

C. Both Zener and avalanche mechanism

D. None of the above

2879. The cold rolled grain oriented steel has ___________ permeability in the direction of the grain orientation?
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A. none of the above

B. nil

C. minimum

D. maximum
2880. A JFET has three terminals, namely________________?
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A. none of the above

B. source, gate, drain

C. emitter, base, collector

D. cathode, anode, grid

2881. The weight of copper of both armature and field windings decreases with __________ in number of poles?
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A. none of the above

B. decrease

C. either of the above

D. increase
2882. Two multimeters A and B have sensitivities of 10 kO/V and 30 kO/V respectively. Then ______________?
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A. Multimeter A is more sensitive

B. Multimeter B is more sensitive

C. Both are equally sensitive

D. None of the above

2883. A voltmeter should have ____________resistance?
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A. Zero

B. Very high

C. None of the above

D. Very low

2884. ICs are generally made of ________________?
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A. None of the above

B. Copper

C. Silicon

D. Germanium

2885. The slot leakage can be calculated by making which of the following assumptions ?
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A. The permanence of air paths is only considered. The reluctance of iron paths is assumed as zero

B. All of the above

C. The leakage path is straight across the slot and around the iron at the bottom

D. The current in the slot conductors is uniformly distributed over their cross-section

2886. __________is extensively used for those portions of magnetic circuit which carry steady flux and need superior mechanical properties ?
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A. High carbon steel

B. Grey cast-iron

C. Stainless steel

D. Cast steel
2887. A galvanometer of resistance G is shunted by a very small resistance S. The resistance of the resulting ammeter is ______________?
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A. None of the above

B. G+S

C. G-S

D. GS/(G+S)
2888. With direct water cooling it is possible to have ratings of about_____________?
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A. 300 MW

B. 200 MW

C. 600 MW

D. 400 MW

2889. The pinch-off voltage of a JFET is about _______________?
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A. 15 V

B. 0.6 V

C. 25 V

D. 5 V
2890. The most inexpensive switch is _____________ switch?
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A. None of the above

B. Electronic

C. Mechanical

D. Electromechanical

2891. A power supply has a voltage regulation of 1%. If the no-load voltage is 20 V, what is the full-load voltage ?
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A. 7 V

B. 8 V

C. 2 V

D. 6 V

2892. Which of the following methods is used for air cooling of turbo-alternators ?
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A. One sided axial ventilation

B. Multiple inlet system

C. Two sided axial ventilation

D. All of the above
2893. The horizontal plates of a CRO are supplied with _____________ to observe the waveform of signal?
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A. Cosine wave

B. None of the above

C. Sinusoidal wave

D. Sawtooth wave
2894. The high voltage winding is usually which of the following type ?
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A. All of the above types

B. Cylindrical winding with circular conductors

C. Continuous disc type winding with rectangular conductors

D. Cross-over winding with either circular or small rectangular conductors

2895. One would find a clamping circuit in ___________________?
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A. Receiving antenna

B. Television receiver

C. Radio transmitter

D. Radio receiver

2896. Helical windings are used in________________?
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A. none of the above

B. shell type transformers

C. power transformers

D. distribution transformers

2897. A Zener diode that has very narrow depletion layer will breakdown by____________ mechanism?
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A. Avalanche

B. Zener

C. Both avalanche and Zener

D. None of the above

2898. Hot rolled sheets have ___________ value of permeability?
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A. zero

B. high

C. low

D. none of the above

2899. The usual values of maximum flux densities for distribution transformers using hot rolled silicon steel are______________?
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A. 0.5 to 0.8 Wb/m2

B. 0.8 to 1.0 Wb/m2

C. 1.4 to 1.8 Wb/m2

D. 1.1 to 1.35 Wb/m2
2900. The source terminal of a JEFT corresponds to _____________ of a vacuum tube?
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A. plate

B. cathode

C. grid

D. none of the above