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
2901. The heat dissipated by from a surface depends upon its temperature and its characteristics like colour, roughness etc?
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A. any of the above

B. convection

C. radiation

D. conduction

2902. The time taken by the machine to attain 0.632 of its final steady temperature rise is called_____________?
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A. cooling time constant

B. heating time constant

C. none of the above

D. either A. or B.

2903. Which of the following methods does not take into account the maximum temperature rise under variable load conditions ?
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A. Equivalent current method

B. Equivalent power method

C. Method of average losses

D. Equivalent torque method

2904. If the negative potential on the control grid of CRT is increased, the intensity of spot _____________?
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A. Is increased

B. Is decreased

C. None of the above

D. Remains the same

2905. _______________is universally used for windings of electrical machines because it is easily workable without any possibility of fracture?
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A. Copper

B. Aluminium

C. Steel

D. Silver

2906. The resistivity of water should not be less than_____________?
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A. 100 Q m

B. 1000 Q m

C. 2000 Q m

D. 10 Q m

2907. When a transistor is driven to saturation, ideally the output is _____________?
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A. VCC

B. 2VCC

C. VCC/2

D. 0
2908. The transconductance of a JFET ranges from ________________?
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A. 500 to 1000 mA/V

B. 100 to 500 mA/V

C. above 1000 mA/V

D. 0.5 to 30 mA/V
2909. A MOSFET can be operated with________________?
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A. negative gate voltage only

B. positive gate voltage only

C. none of the above

D. positive as well as negative gate voltage
2910. Another name for Zener diode is ______________diode?
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A. Current

B. Breakdown

C. Voltage

D. Power

2911. A common base configuration of a pnp transistor is analogous to _____________?of a JFET
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A. common drain configuration

B. common source configuration

C. none of the above

D. common gate configuration
2912. A current density of __________ is ilsed for large power transformers with forced circulation of oil or with water cooling coils?
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A. 3.5 to 4.5 A/mm2

B. 1.5 to 2.5 A/mm2

C. 4.0 to 5.0 A/mm2

D. 5.4 to 6.2 A/mm2
2913. A certain p-channel E-MOSFET has VGS(th) = -2V. If VGS= 0V, the drain current is ____________?
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A. maximum

B. IDSS

C. ID(on)

D. 0 mA
2914. When load current is zero, the Zener current will be_____________?
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A. Zero

B. Maximum

C. Minimum

D. None of the above

2915. In direct cooled system using hydrogen both stator and rotor conductors are made____________?
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A. perforated

B. hollow

C. any ofthe above

D. solid

2916. _________________cannot be fabricated on an IC?
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A. Transistors

B. Resistors

C. Large inductors and transformers

D. Diodes

2917. The voltage control in electric supply networks in required on account of which of the following reasons ?
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A. All of the above

B. Control of active and reactive power

C. Adjustment of short period daily and seasonal voltage variations in accordance with variations of load

D. Adjustment of voltage at consumers premises within statutory limits

2918. By which of the following methods the temperature rise of windings and other parts may be determined ?
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A. Thermometer method

B. Embedded temperature detector method

C. Resistance method

D. Any of the above
2919. Which of the following is an advantage of hydrogen cooling ?
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A. Increase in ratings

B. Smaller size of coolers

C. All of the above

D. Increase in efficiency

E. Increase in life

2920. In a loaded Zener regulator, which is the largest Zener current ?
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A. Zener current

B. Load current

C. Series current

D. None of the above

2921. For 275 kV transformers, using cold rolled grain oriented steel, which of the following values of flux density may be used?
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A. 1.6 Wb/m2

B. 1.3 Wb/m2

C. None of the above

D. 1.0 Wb/m2

E. 1.1 Wb/m2

2922. As the junction temperature increases, the voltage breakdown point for avalanche mechanism______________?
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A. Increases

B. Remains the same

C. None of the above

D. Decrease

2923. The forced oil and air circulation method is usual one for transformers of capacities____________?
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A. upto 5 MVA

B. upto 10 MVA

C. upto 20 MVA

D. 30 MVA upwards
2924. In a JFET, IDSS is known as ________________?
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A. drain to source current

B. drain to source current with gate open

C. none of the above

D. drain to source current with gate shorted
2925. A negative clipper 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

2926. Materials exhibiting zero value of resistivity are known as ____________ ?
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A. conductors

B. insulators

C. semiconductors

D. superconductors
2927. A relay is ___________switch?
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A. None of the above

B. An electronic

C. A mechanical

D. An electromechanical
2928. As the junction temperature increases, the voltage breakdown point for Zener mechanism _______________?
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A. Is decreased

B. Is increased

C. Remains the same

D. None of the above

2929. If the load resistance decreases in a Zener regulator, then Zener current ______________?
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A. Stays the same

B. Increases

C. Decreases

D. None of the above

2930. A VTVM is never used to measure ______________?
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A. None of the above

B. Resistance

C. Voltage

D. Current
2931. A 5 mA changes in Zener current produces a 50 mA change in Zener voltage. What is the Zener impedance ?
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A. 10 O

B. 1 O

C. 100 O

D. 1 O

2932. A galvanometer in series with a high resistance is called_______________?
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A. None of the above

B. A wattmeter

C. A voltmeter

D. An ammeter

2933. In a D.C. machine the current per brush arm should not be more than_____________?
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A. 100 A

B. 200 A

C. 300 A

D. 400 A
2934. Commercial available medium size machines have a speed range of __________ ?
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A. 200 to 400 r.p.m

B. 2000 to 2500 r.p.m

C. 1000 to 1500 r.p.m

D. 600 to 1000 r.p.m

2935. In a multivibrator, we have___________ feedback?
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A. Negative

B. 100 % positive

C. Both positive and negative

D. None of the above

2936. Multiple inlet system of air cooling of turbo-alternators can be used for machines of rating upto_______________?
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A. 30 MW

B. 150 MW

C. 10 MW

D. 60 MW
2937. The maximum speed of electronic switch can be _____________operations per second?
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A. 109

B. 10

C. 104

D. 1000

2938. If 2% of the main current is to be passed through a galvanometer of resistance G, then resistance of the shunt required is ________________?
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A. 50 G

B. G/49

C. 49 G

D. G/50

2939. A JFET is also called____________ transistor?
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A. bipolar

B. unipolar

C. unijunction

D. none of the above

2940. In self cooled motors the cooling time constant is about ___________ than the heating time constant because cooling conditions are worse at standstill?
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A. 3 to 4 times greater

B. 4 to 5 times greater

C. 2 to 3 times greater

D. none of the above

2941. Zener diode are generally made of _____________?
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A. None of the above

B. Germanium

C. Carbon

D. Silicon
2942. A power supply can deliver a maximum rated current of 0.5 A at full-load output voltage of 20 V. What is the minimum load resistance that you can connect across the supply?
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A. 20 O

B. 40 O

C. 15 O

D. 10 O

2943. cooling is the process of dissipating the armature and field winding losses to a cooling medium circulating within the winding insulation wall______________?
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A. Direct

B. Conventional

C. Indirect

D. Any of the above

2944. If a multimeter has a sensitivity of 1000 O per volt and reads 50 V full scale, its internal resistance is _____________?
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A. 20 kO

B. 50 kO

C. 10 kO

D. None of the above

2945. A JFET has ____________ power gain?
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A. small

B. very high

C. very small

D. none of the above

2946. For a differentiating circuit to be effective, the RC product should be ___________ the time period of the input wave?
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A. 5 times greater than

B. At least 10 times greater than

C. Equal to

D. 5 times smaller than

2947. In a D.C. machine, the value of peripheral speed should not, normally, exceed___________?
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A. 20 m/s

B. 30 m/s

C. 40 m/s

D. 10 m/s

2948. On which of the following variables heat convected depends ?
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A. Thermal resistivity, density, specific heat

B. Temperature difference between heated surface and coolant

C. Gravitational constant

D. Power density

E. All of the above
2949. In a portable instrument, the controlling torque is provided by_____________?
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A. eddy currents

B. all of the above

C. gravity

D. spring
2950. The transient response, with feedback system_____________?
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A. rises quickly

B. decays quickly

C. decays slowly

D. rises slowly