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
2001. The arcing contacts in a circuit breaker are made of______________?
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A. aluminium alloy

B. porcelain

C. copper tungsten alloy

D. electrolytic copper

2002. An amplifier using an opamp with slew rate SR=1v/sec has a gain of 40db.If this amplifier has to faithfully amplify sinusoidal signals from dc to 20KHz without introducing any slew-rate induced distortion, then the input signal level exceed_____________?
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A. 39.5mV

B. 395mV

C. 795mV

D. 795mV
2003. Which of the following AC. motors is usually used in large motor-generator sets?
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A. Synchronous motor

B. Any of the above

C. Slip ring induction motor

D. Squirrel cage induction motor

2004. H.R.C. fuses provide best protection against________________?
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A. short-circuits

B. overload

C. open-circuits

D. reverse current

2005. Mercury, in arc rectifiers, is chosen for cathode because________________?
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A. it remains in liquid state at ordinary temperature

B. its atomic weight is quite high

C. its ionization potential is relatively low

D. its boiling point and specific heat are low

E. all of the above
2006. The approximate input impedance of the opamp circuit which has Ri=10k, Rf=100k, RL=10k?
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A. 110k

B. ?

C. 10k

D. 120k

2007. Admittance relay is __________ relay?
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A. directional

B. impedance

C. non-directional

D. none of the above

2008. Which of the following materials are diamagnetic ?
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A. Silver

B. Silver and copper

C. Copper

D. Iron

2009. Which of the following methods may be used to convert A.C. system to D.C ?
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A. All of the above

B. Motor converters

C. Rotary converters

D. Rectifiers

E. Motor-generator sets

2010. Temporary magnets are used in______________?
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A. loud-speakers

B. all of the above

C. motors

D. generators

2011. On which of the following effects of electric current a fuse operates ?
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A. Heating effect

B. Photoelectric effect

C. Electrostatic effect

D. Magnetic effect

2012. In a circuit breaker the basic problem is to________________?
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A. extinguish the arc

B. transmit large power

C. emit the ionizing electrons

D. maintain the arc

2013. Thermal circuit breaker has____________?
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A. delayed trip action

B. instantaneous trip action

C. both of the above

D. none of the above

2014. The inverse definite mean time relays are used for over current and earth fault protection of transformer against_________________?
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A. heavy loads

B. internal short-circuits

C. all of the above

D. external short-circuits

2015. A rotary converter operates at a______________?
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A. none of the above

B. high power factor

C. low power factor

D. zero power factor

2016. Which of the following statements is correct ?
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A. The magnetic flux inside an exciting coil is lower than its outside surface

B. The magnetic flux inside the exciting coil is same as on its outside surface

C. The magnetic flux inside an exciting coil is zero

D. The magnetic flux inside the exciting coil is greater than its outside surface

2017. The use of permanent magnets is. not made in_____________?
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A. transformers

B. loud-speakers

C. magnetoes

D. energy meters

2018. On which of the following routine tests are conducted ?
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A. Minimum oil circuit breakers

B. All of the above

C. Oil circuit breakers

D. Air blast circuit breakers

2019. Magnetism of a magnet can be destroyed by_____________?
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A. heating

B. by inductive action of another magnet

C. by all above methods

D. hammering

2020. The torque produced in induction type relay (shaded pole structure) is_____________?
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A. proportional to square of the current

B. proportional to the current

C. inversely proportional to the square of the current

D. inversely proportional to the current

2021. H.R.C. fuse, as compared to a rewirable fuse, has_________________?
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A. high rupturing capacity

B. high speed of operation

C. all of the above

D. no ageing effect

2022. The delay fuses are used for the protection of ___________?
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A. light circuits

B. motors

C. power outlet circuits

D. fluorescent lamps

2023. Distance relays are generally_____________?
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A. reactance relays

B. split-phase relays

C. none of the above

D. impedance relays

2024. Which of the following are the applications of D.C. system ?
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A. Arc lamps for search lights

B. Battery charging work

C. All of the above

D. Arc welding

E. Electrolytic and electro-chemical processes

2025. Which of the following metals is generally manufactured by electrolysis process ?
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A. Load

B. Zinc

C. None of the above

D. Aluminium

E. Copper

2026. When a rectifier is loaded which of the following voltage drops take place ?
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A. Voltage drop in transformer reactance

B. All of the above

C. Arc voltage drop

D. Voltage drop in resistance of transformer and smoothing chokes

2027. transmission line has reflection coefficient as one?
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A. Open circuit

B. None of the above

C. Long

D. Short-circuit

2028. Glass rectifiers are usually made into units capable of D.C. output (maximum continuous rating) of _____________?
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A. 200 A at 200 V

B. 400 A at 400 V

C. 100 A at 100 V

D. 500 A at 500 V

E. 300 A at 300 V

2029. The change of cross-sectional area of conductor in magnetic field will affect______________?
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A. reluctance of conductor

B. resistance of conductor

C. A. and B. both in the same way

D. none of the above

2030. An isolator is installed_____________?
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A. to operate the relay of circuit breaker

B. as a substitute for circuit breaker

C. always independent of the position of circuit breaker

D. generally on both sides of a circuit breaker
2031. In the above circuit the current ix is___________?
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A. 0.2A

B. 0.5A

C. 1/12A

D. 0.6A

2032. The closed-loop voltage gain of an inverting amplifier equal to______________?
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A. The input resistance

B. The open-loop voltage gain

C. The ratio of the input resistance to feedback resistance

D. The feedback resistance divided by the input resistance
2033. The voltage appearing across the contacts after opening of the circuit breaker is called__________voltage
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A. operating

B. arc

C. recovery

D. surge

E. none of the above

2034. How many op-amps are required to implement this equation Vo = V1?
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A. 4

B. 3

C. 1

D. 2

2035. When a wave propagates on a transmission line, it suffers reflection several times at_____________?
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A. tapping

B. sending end

C. all of the above

D. load end

E. sending and other end
2036. Ferrites are a sub-group of_______________?
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A. ferro-magnetic materials

B. non-magnetic materials

C. paramagnetic materials

D. ferri-magnetic materials
2037. The inductive interference between power and communication line can be minimized by__________?
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A. transposition of the power line

B. transposition of the communication line

C. both (A) and (B)

D. increasing the distance between the conductors

2038. If a copper disc is rotated rapidly below a freely suspended magnetic needle, the magnetic needle shall start rotating with a velocity?
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A. equal to that of disc and in the opposite direction

B. less than that of disc and in the same direction

C. equal to that of disc and in the same direction

D. less than that of disc but in opposite direction

2039. The ground wire should not be smaller than No _________ copper
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A. 10

B. 6

C. 2

D. 4

2040. The short circuit in any winding of the transformer is the result of_______________?
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A. insulation failure

B. mechanical vibration

C. impulse voltage

D. loose connection

2041. Ionization in circuit breaker is facilitated by___________?
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A. increasing field strength

B. increase of mean free path

C. high temperature

D. all of the above
2042. In the differential voltage gain & the common mode voltage gain of a differential amplifier are 48db & 2db respectively, then its common mode rejection ratio is________________?
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A. 25dB

B. 46dB

C. 23dB

D. 50dB

2043. A fuse is never inserted in____________?
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A. negative of D.C. circuit

B. phase dine

C. positive of D.C. circuit

D. neutral wire
2044. The material used for fuse must have_____________?
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A. low melting point and -low specific resistance

B. high melting point and low specific resistance

C. low melting point and any specific resistance

D. low melting point and high specific resistance
2045. The time of closing the cycle, in modern circuit breakers is_____________?
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A. 0.10 sec

B. none of the above

C. 0.001 sec

D. 0.01 sec

E. 0.003 sec
2046. A rotary converter is a single machine with______________?
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A. one armature and one field

B. none of the above

C. one armature and two fields

D. two armatures and one field

2047. Circuit breakers are essentially____________?
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A. current carrying contacts called electrodes

B. circuits to break the system

C. transformers to isolate the two systems

D. any of the above

E. arc extinguishers

2048. The two conductors of a transmission line carry equal current I in opposite directions. The force on each conductor is________________?
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A. proportional to distance between the conductors

B. inversely proportional to I

C. proportional to 7

D. proportional to X
2049. A material which is slightly repelled by a magnetic field is known as_____________?
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A. diamagnetic material

B. paramagnetic material

C. conducting material

D. ferromagnetic material

2050. Core of an electromagnet should have____________?
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A. low coercivity

B. high susceptibility

C. both of the above

D. none of the above