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
4051. Transformer coupling can be used in______________amplifiers?
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A. Only power

B. Only voltage

C. None of the above

D. Either power or voltage
4052. Class C amplifiers are used as ___________________?
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A. AF amplifiers

B. None of the above

C. amplifiers

D. Detectors

4053. Low efficiency of a power amplifier results in_________________?
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A. Less battery consumption

B. More battery consumption

C. Low forward bias

D. None of the above

4054. A class A power amplifier uses _________________?
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A. None of the above

B. Three transistors

C. Two transistors

D. One transistor
4055. Power amplifiers generally use transformer coupling because transformer permits______________?
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A. Distortionless output

B. Impedance matching

C. Cooling of the circuit

D. Good frequency response

4056. What will be the collector efficiency of a power amplifier having zero signal power dissipation of 5 watts and a.c. power output of 2 watts ?
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A. 80%

B. 40%

C. 50%

D. 20%

4057. If the gain versus frequency curve of a transistor amplifier is not flat, then there is distortion ?
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A. None of the above

B. Intermodulation

C. Frequency

D. Amplitude

4058. ________________ coupling is generally employed in power amplifiers?
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A. Impedance

B. Transformer

C. RC

D. direct

4059. A transformer coupled class A power amplifier has a load of 100 O on the secondary. If the turn ratio is 10:1, what is the value of load appearing on the primary?
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A. 20 kO

B. 100 kO

C. 10 kO

D. 5 kO

4060. If the power rating of a transistor is 1W and collector current is 100mA, then maximum allowable collector voltage is________________?
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A. 100V

B. 10V

C. 1V

D. 20V

4061. The output stage of a multistage amplifier is also called _________________-?
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A. Mixer stage

B. Power stage

C. Detector stage

D. F stage

4062. Class _____________ operation gives the maximum distortion?
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A. A

B. AB

C. B

D. C
4063. If a transistor is operated in such a way that output current flows for 60o of the input signal, then it is ______________ operation?
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A. Class B

B. None of the above

C. Class C

D. Class A

4064. The class B push-pull circuit can deliver 100 W of a.c. output power. What should be the minimum power rating of each transistor ?
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A. 40 W

B. 20 W

C. 10 W

D. 80 W

4065. The output transformer used in a power amplifier is a _____________ transformer?
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A. 1:1 ratio

B. None of the above

C. Step-down

D. Step-up

4066. The disadvantage of impedance matching is that it _______________?
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A. Gives distorted output

B. None of the above

C. Requires a transformer

D. Gives low power output

4067. The push-pull circuit must use ______________ operation?
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A. Class B

B. Class A

C. Class C

D. Class AB

4068. In class A operation, the operating point is generally located_____________of the d.c. load line?
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A. None of the above

B. At cut off point

C. At the middle

D. At saturation point

4069. For the same a.c. power output as above, what should be the minimum power rating of transistor for class B operation?
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A. 10 W

B. 8 W

C. 4 W

D. None of the above

4070. A 2-transistor class B power amplifier is commonly called ______________ amplifier?
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A. Push-pull

B. Differential

C. Symmetrical

D. Dual

4071. The most important consideration in power amplifier is __________________?
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A. To keep the transformer cool

B. None of the above

C. Collector efficiency

D. Biasing the circuit

4072. The maximum efficiency of resistance loaded class A power amplifier is _________________?
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A. 50%

B. 30%

C. 5%

D. 25%
4073. If the zero signal dissipation of a transistor is 1W, then power rating of the transistor should be at least___________________?
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A. 5 W

B. 33 W

C. 1 W

D. 75 W

4074. The output stage of a multistage amplifier usually employs _________________?
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A. Class A power amplifier

B. Preamplifier

C. None of the above

D. Push-pull amplifier
4075. The output stage of a multistage amplifier usually employs______________?
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A. Push-pull amplifier

B. None of the above

C. Preamplifier

D. Class A power amplifier

4076. A class A power amplifier is sometimes called______________amplifier?
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A. Symmetrical

B. Single-ended

C. Differential

D. Reciprocating

4077. The maximum collector efficiency of class B operation is ________________?
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A. 5%

B. 5%

C. 50%

D. 90%

4078. An AF amplifier is shielded to ________________?
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A. Keep the amplifier cool

B. Prevent induction due to stray magnetic fields

C. Protect from rusting

D. None of the above

4079. The maximum a.c. power output from a class A power amplifier is 10 W. What should be the minimum power rating of the transistor used ?
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A. 5 W

B. 10 W

C. 20 W

D. 15 W

4080. The maximum efficiency of transformer coupled class A power amplifier is _______________?
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A. 80%

B. 50%

C. 45%

D. 30%

4081. The pulsating d.c. applied to power amplifier causes________________?
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A. Hum in the circuit

B. Excessive forward voltage

C. Burning of transistor

D. None of the above

4082. A charge of 0.10C accelerated through a potential difference of 1000V acquires kinetic energy_______________?
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A. 1000J

B. 200J

C. 100 eV

D. 100J
4083. Which one of the following can be taken as the measure of electric intensity ?
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A. VF/A

B. F/A

C. q/VA

D. V/A
4084. A capacitor having capacitance of 5 uF is charged to a potential difference of 10,000 V. The energy stored in the capacitor is__________?
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A. 200 joules

B. 150 joules

C. 250 joules

D. 50 joules

4085. The lines of force due to charged particles are_________?
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A. sometimes curved

B. always curved

C. always straight

D. none of the above

4086. The electrostatic force between two charges of one coulomb each and placed at a distance of 0.5 m will be____________?
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A. 36 x 108 N

B. 36 x 107 N

C. 36 x 10fa

D. 36 x 109 N
4087. A capacitor charged to 200 V has 2000 (iC of charge. The value of capacitance will be_____________?
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A. 100 nF

B. 10 F

C. 10 uF

D. 1000 uF

4088. A condenser suitable for D.C. only is________?
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A. poled aluminium electrolytic condenser

B. metallic plate variable gang condenser

C. oil impregrated paper condenser

D. metallic paper capacitor

4089. If three 10 uF capacitors are connected in parallel, the net cararitance is___________?
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A. 50 uF

B. 40 uF

C. 20 uF

D. 30 uE
4090. Which of the following statements is incorrect _________________?
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A. A wire cable has distributed capacitance between the conductors

B. The stored energy in a capacitor increases with applied voltage

C. The leakage resistance of ceramic capacitors is generally high

D. The stored energy in a capacitor decreases with reduction in value of capacitance
4091. The electric field at a point situated at a distance d from straight charged conductor is____________?
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A. inversely proportional to d

B. proportional to d

C. none of the above

D. inversely proportional to d

4092. The relative permittivity has the following units__________?
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A. Wb/m

B. F/m

C. no units

D. m/F

4093. A mica capacitor and a ceramic capacitor both have the same physical dimensions. Which will have more value of capacitance _______?
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A. Ceramic capacitor

B. Mica capacitor

C. Both will have identical value of capacitance

D. It depends on applied voltage

4094. Which of the following expression is correct for electric field strength___________?
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A. E = D/E

B. E= nD2

C. E = jtD

D. E = D2/t

4095. Acharge which when placed in vacuum from an equal and similar charge repels with a force of 9 x 10 N, is known as_____________?
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A. milli-coulomb

B. coulomb

C. pico-coulomb

D. micro-coulomb
4096. The relative permittivity of free space is given by__________?
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A. 10

B. 1000

C. 100

D. 1
4097. ____________field is associated with the capacitor?
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A. Electric

B. Magnetic

C. Both (A) and (B)

D. None of the above

4098. The metallic spheres A and B of radii 2m and 4m respectively carry the same charge 4 x 10 8C. If the spheres are connected by a copper wire_______________?
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A. charge will flow from A to B

B. charge will flow from B to A

C. no flow of charge will occur

D. both a and b are possible

4099. The total deficiency or excess of electrons in a body is known as____________?
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A. voltage

B. potential gradient

C. charge

D. current

4100. Paper capacitors usually have a tolerance of___________?
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A. 5%

B. 20%

C. 15%

D. 10%