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
2051. relay is preferred for phase fault on short transmission line?
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A. Induction type

B. None of the above

C. Impedance

D. Reactance
2052. In the left hand rule, forefinger always represents______________?
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A. magnetic field

B. current

C. voltage

D. direction of force on the conductor

2053. For which of the following materials the saturation value is the highest ?
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A. Ferromagnetic materials

B. Paramagnetic materials

C. Diamagnetic materials

D. Ferrites
2054. A short-circuit is identified by_____________?
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A. heavy current flow

B. no current flow

C. voltage drop

D. voltage rise

2055. The cathdde voltage drop, in a mercury arc rectifier, is due to_____________?
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A. expenditure of energy in overcoming the electrostatic field

B. expenditure of energy in liberating electrons from the mercury

C. expenditure of energy in ionization

D. surface resistance

2056. D.C. shunt relays are made of_____________?
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A. few turns of thin wire

B. many turns of thin wire

C. few turns of thick wire

D. many turns of thick wire

2057. What will be the current passing through the ring shaped air cored coil when number of turns is 800 and ampere turns are 3200 ?
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A. 4

B. 8

C. 6

D. 2

2058. When two ends of a circular uniform wire are joined to the terminals of a battery, the field at the center of the circle?
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A. will depend on the radius of the circle

B. will be zero

C. will depend on the amount of e.m.f. applied

D. will be infinite

2059. A thermal protection switch can protect against_____________?
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A. temperature

B. short-circuit

C. overload

D. over voltage

2060. A 200 turn coil having an axial length of 30 mm and a radius of 10 mm is pivoted in a magnetic field having a flux density of 0.8 T. If the coil carries a current of 0.5 A, the torque acting on the coil will be_____________?
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A. 0.48 N-m

B. 0.0048 N-m

C. 8 N-m

D. 0.048 N-m
2061. The left hand rule correlates to______________?
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A. current, induced e.m.f. and direction of force on a conductor

B. self induction, mutual induction and direction of force on a conductor

C. magnetic field, electric field and direction of force on a conductor

D. current, magnetic field and direction of force on a conductor
2062. Directional relays are based on flow of____________?
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A. voltage wave

B. power

C. current

D. all of the above

2063. A fuse is connected_______________?
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A. none of the above

B. either in series or in parallel with circuit

C. in parallel with circuit

D. in series with circuit
2064. Burden of a protective relay is the power______________?
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A. required to operate the circuit breaker

B. none of the above

C. developed by the relay circuit

D. absorbed by the circuit of relay
2065. Gilbert is a unit of_______________?
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A. permittivity

B. electromotive force

C. magnetomotive force

D. conductance

2066. One telsa is equal to___________?
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A. 1 Wb/m2

B. 1 mWb/m2

C. 1 Wb/m

D. 1 Wb/mm2

2067. The unit of relative permeability is_____________?
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A. it is dimensionless

B. henry/sq. m

C. henry/metre

D. henry

2068. Which of the following is reversible in action ?
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A. None of the above

B. Any of the above

C. Rotary converter

D. Motor generator set

E. Motor converter

2069. A rotary converter combines the function of____________?
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A. an induction motor and a D.C. generator

B. a D.C. series motor and a D.C. generator

C. none of the above

D. a synchronous motor and a D.C. generator
2070. Tesla is a unit of_____________?
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A. inductance

B. flux density

C. flux

D. field strength

2071. The electromagnet has 50 turns and a current of 1A flows through the coil. If the length of the magnet circuit is 200 mm, what is the magnetic field strength ?
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A. 250 AT/m

B. 2.5 AT/m

C. 2500 AT/m

D. 25 AT/m

2072. A rectangular magnet of magnetic moment M is cut into two piece of same length, the magnetic moment of each piece will be______________?
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A. M

B. M/2

C. M/4

D. 2 M

2073. The two input terminals of an opamp are labeled as______________?
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A. Positive and negative

B. Inverting and non inverting

C. High and low

D. Differential ans non differential

2074. Oil switches are employed for_____________?
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A. low currents circuits

B. high voltages and large currents circuits

C. all circuits

D. low voltages circuits

2075. In a rotary converter armature currents are______________?
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A. partly a.c. and partly d.c.

B. d.c. only

C. a.c. only

2076. The voltage drop between the anode and cathode, of a mercury arc rectifier comprises of the following_____________?
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A. cathode drop and arc drop

B. anode drop and arc drop

C. anode drop, cathode drop and arc drop

D. anode drop and cathode drop

2077. The ideal OP-AMP has the following characteristics
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A. Ri=? ,A=? ,R0=0

B. Ri=? ,A=? ,R0=?

C. Ri=0 ,A=? ,R0=0

D. Ri=0 ,A=? ,R0=?

2078. The information to the circuit breaker under fault conditions is provided by____________?
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A. H.R.C. only

B. rewirable fuse

C. all of the above

D. relay
2079. In a mercury arc rectifier________ flow from anode to cathode
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A. ions

B. any of the above

C. ions and electrons

D. electrons

2080. Two long parallel conductors carry 100 A. If the conductors are separated by 20 mm, the force per meter of length of each conductor will be_____________?
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A. 100 N

B. 0.1 N

C. 10 N

D. 1 N

2081. Thermal overload relays are used to protect the motor against over current due to____________?
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A. short-circuits

B. heavy loads

C. grounds

D. all of the above

2082. The voltage drop at anode, in a mercury arc rectifier is due to_____________?
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A. self restoring property of mercury

B. energy spent in overcoming the electrostatic field

C. high ionization potential

D. high temperature inside the rectifier

2083. Which of the following is expected to have the maximum permeability ?
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A. Brass

B. Ebonite

C. Zinc

D. Copper

2084. Over voltage protection is recommended for______________?
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A. hydro-electric generators

B. none of the above

C. steam turbine generators

D. all of the above

E. gas turbine generators

2085. Circuit breakers are essentially______________?
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A. circuits to break the system

B. any of the above

C. current carrying contacts called electrodes

D. transformers to isolate the two systems

E. arc extinguishers

2086. Overfluxing protection is recommended for_____________?
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A. auto-transformer of the power plant

B. station transformer of the power plant

C. generator transformer of the power plant

D. distribution transformer

2087. The force between two long parallel conductors is inversely proportional to_____________?
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A. current in one conductor

B. distance between the conductors

C. product of current in two conductors

D. radius of conductors

2088. Unit for quantity of electricity is_____________?
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A. ampere-hour

B. watt

C. joule

D. coulomb
2089. Calculate the cutoff frequency of a first-order low-pass filter for R1 = 2.5k? and C1 = 0.05?F___________?
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A. 127.3 kHz

B. 1.273kHz

C. 127.3 Hz

D. 12.73kHz

2090. A transmission line is protected by_____________?
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A. inrush protection

B. distance protection

C. time graded and current graded over current protection

D. both (B) and (C)

E. none of the above

2091. An ideal OP-AMP is an ideal______________?
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A. Voltage controlled voltage source

B. voltage controlled current source

C. Current controlled voltage source

D. Current controlled Current source

2092. In a single phase rotary converter the number of slip rings will be_____________?
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A. three

B. four

C. two

D. none

E. six

2093. Induction cup relay is operated due to changes in________________?
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A. voltage

B. all of the above

C. impedance

D. current

2094. For the protection of power station buildings against direct strokes the requirements are___________?
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A. interception, conduction and dissipation

B. interception

C. interception and conduction

D. interception, conduction, dissipation and reflection

E. none of the above

2095. Which of the following is a vector quantity ?
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A. Magnetic field intensity

B. Relative permeability

C. Magnetic potential

D. Flux density

2096. A certain amount of current flows through a ring-shaped coil with fixed number of turns. How does the magnetic induction B varies inside the coil if an iron core is threaded into coil without dimensional change of coil ?
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A. Decreases

B. First increases and then decreases depending on the depth of iron insertion

C. Remains same

D. Increases
2097. The magneto-motive force is______________?
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A. the passage of magnetic field through an exciting coil

B. the voltage across the two ends of exciting coil

C. the flow of an electric current

D. the sum of all currents embraced by one line of magnetic field
2098. Arc in a circuit behaves as_______________?
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A. a resistance increasing with voltage rise across the arc

B. an inductive reactance

C. a capackive reactance

D. a resistance decreasing with voltage rise across the arc
2099. The fuse blows off by___________?
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A. none of the above

B. burning

C. melting

D. arcing

2100. Main causes of noisy solenoid are______________?
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A. strong tendency of fan out of laminations at the end caused by repulsion among magnetic lines of force

B. uneven bearing surface, caused by dirt or uneven wear between moving and stationary parts

C. both of above

D. none of the above