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
1951. In a mercury arc rectifier positive ions are attracted towards______________?
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A. anode

B. shell bottom

C. cathode

D. mercury pool

1952. Protective relays are devices that detect abnormal conditions in electrical circuits by measuring_____________?
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A. voltage during abnormal condition

B. constantly the electrical quantities which differ during normal and abnormal conditions

C. current during abnormal condition

D. none of the above

1953. A 300 mm long conductor is carrying a current of 10 A and is situated at right angles to a magnetic field having a flux density of 0.8 T ; the force on the conductor will be____________?
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A. 240 N

B. 24 N

C. 0.24 N

D. 2.4 N
1954. Hysteresis loop in case of magnetically hard materials is more in shape as compared to magnetically soft materials
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A. rectangular

B. none of the above

C. circular

D. triangular

1955. A balanced 3-phase system consists of_______________?
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A. zero, negative and positive sequence currents

B. positive sequence currents only

C. negative and zero sequence currents

D. zero sequence currents only

1956. How does the magnetic compass needle behave in a magnetic field ?
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A. None of the above

B. It assures a position which follows a line of magnetic flux

C. It starts rotating

D. It assures a position right angle to magnetic field

1957. Short-circuit currents are due to_______________?
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A. single phase to ground faults

B. phase to phase faults

C. any of these

D. three phase faults

E. two phase to ground faults

1958. The potential drop in the arc, in a mercury arc rectifier, varies_____________?
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A. 0.5 V to 1.5 V per cm length of the arc

B. 0.05 V to 0.2 V per cm length of the arc

C. none of the above

D. 2 V to 3.5 V per cm length of the arc
1959. Which of the following statements is correct ?
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A. The conductivity of ferrites is better than ferromagnetic materials

B. The conductivity of ferromagnetic materials is better than ferrites

C. The conductivity of ferrites is same as that of ferromagnetic materials

D. The conductivity of ferrites is very high

1960. Large internal faults are protected by_______________?
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A. merz price percentage differential protection

B. earth fault and positive sequence relays

C. mho and ohm relays

D. horn gaps and temperature relays

1961. Arc in a circuit breaker is interrupted at___________?
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A. maximum current

B. zero current

C. minimum voltage

D. maximum voltage

1962. Series capacitors are used to_________________?
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A. compensate for line capacitive reactance

B. none of the above

C. compensate for line inductive reactance

D. improve line voltage

1963. Overheating of relay contacts or contact born out is due to_______________?
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A. foreign matter on the contact surface

B. too low contact pressure

C. all of the above

D. slow making and breaking of load circuit contacts

1964. A mercury arc rectifier possesses __________ regulation characteristics
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A. exponential

B. none of the above

C. curved line

D. straight line

1965. relays are used for phase faults on long line?
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A. Reactance

B. None of the above

C. Either of the above

D. Impedance
1966. A fuse in a motor circuit provides protection against__________?
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A. overload

B. short-circuit and overload

C. none of the above

D. open circuit, short-circuit and overload

1967. Circuit breakers usually operate under______________?
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A. transient state of short-circuit current

B. sub-transient state of short-circuit current

C. after D.C. component has ceased

D. steady state of short-circuit current

1968. Which of the following is the unit of magnetic flux density ?
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A. tesla

B. lumens

C. none of the above

D. weber

1969. When a transmission line is energized, the wave that propagates on it is____________?
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A. current wave only

B. voltage wave only

C. Both (A) and (B)

D. power factor wave only

1970. The main function of a fuse is to_____________?
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A. open the circuit

B. protect the appliance

C. none of the above

D. prevent excessive currents

E. protect the line

1971. Materials subjected to rapid reversal of magnetism should have______________?
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A. high permeability and low hysteresis loss

B. high co-ercivity and low density

C. high co-ercivity and high retentivity

D. large area oiB-H loop

1972. The relay with inverse time characteristic will operate within____________?
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A. 5 to 10 sec

B. none of the above

C. 5 to 20 sec

D. 1.5 sec

E. 20 to 30 sec

1973. With which of the following, a circuit breaker must be equipped for remote operation ?
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A. All of the above

B. None of the above

C. Time-delay trip

D. Inverse time trip

E. Shunt trip
1974. In which of the following equipment direct current is needed ?
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A. All of the above

B. Time switches

C. Relays

D. Telephones

1975. For which of the following protection from negative sequence currents is provided ?
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A. Transformers

B. Transmission line

C. Generators

D. Motors

1976. The magnetism left in the iron after exciting field has been removed is known as____________?
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A. residual magnetism

B. permeance

C. susceptance

D. reluctance

1977. The short circuit in any winding of the transformer is the result of______________?
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A. impulse voltage

B. mechanical vibration

C. loose connection

D. insulation failure

1978. Hysteresis is desirable in Schmitt-trigger, because______________?
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A. Devices in the circuit should be allowed time for saturation and desaturation

B. Effects of temperature would be compensated

C. Energy is to be stored/discharged in parasitic capacitances

D. It would prevent noise from causing false triggering

1979. The materials are a bit inferior conductors of magnetic flux than air
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A. dielectric

B. ferromagnetic

C. diamagnetic

D. paramagnetic

1980. Magnetic moment is a_____________?
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A. vector quantity

B. pole strength

C. scalar quantity

D. universal constant

1981. How many op-amps are required to implement this equationop-amps?
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A. 2

B. 1

C. 3

D. 4

1982. The arc voltage produced in A.C. circuit breaker is always_____________?
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A. leading the arc current by 90

B. none of the above

C. in phase with the arc current

D. lagging the arc current by 90?

1983. he retentivity (a property) of material is useful for the construction of_______________?
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A. permanent magnets

B. electromagnets

C. non-magnetic substances

D. transformers

1984. Which of the following is the least expensive protection for overcurrent is low voltage system ?
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A. None of the above

B. Rewireable fuse

C. Air break circuit breaker

D. Isolator

E. Oil circuit breaker

1985. Series reactors should have________________?
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A. low impedance

B. high impedance

C. low resistance

D. high resistance

1986. If cathode and anode connections in a mercury arc rectifier are inter changed_____________?
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A. the rectifier will not operate

B. internal losses will be reduced

C. both ion and electron streams will move in the same direction

D. the rectifier will operate at reduced efficiency

1987. An ideal OP-AMP is an ideal__________?
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A. Voltage controlled Current source

B. Current controlled Voltage source

C. Current controlled Current source

D. Voltage controlled Voltage source
1988. SF6 gas______________?
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A. has pungent small

B. is yellow in colour

C. is nontoxic

D. none of the above

E. is lighter than air

1989. Which of the following type of materials are not very important for engineering applications ?
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A. Ferromagnetic

B. Diamagnetic

C. Paramagnetic

D. None of the above

1990. To protect most of the electrical equipment handling low power, the types of relays used are______________?
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A. thermocouple

B. electronic and bimetallic

C. both (A) and (B)

D. none of the above

1991. he retentivity (a property) of material is useful for the construction of__________?
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A. transformers

B. electromagnets

C. non-magnetic substances

D. permanent magnets
1992. Differential amplifiers are used in______________?
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A. Buffers

B. Voltage followers

C. Voltage regulators

D. Instrumentation amplifiers
1993. For which of the following materials the net magnetic moment should be zero ?
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A. Diamagnetic materials

B. Antiferrimagnetic materials

C. Antiferromagnetic materials

D. Ferrimagnetic materials

1994. Bus coupler is very essential in arrangement______________?
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A. single bus

B. double bus, double breaker

C. main and transfer bus

D. all of the above

1995. Which of the following parameter can be neglected for a short line ?
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A. Resistance

B. Inductance

C. Reactance

D. Capacitance
1996. Air gap has_________eluctance as compared to iron or steel path?
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A. higher

B. zero

C. little

D. lower
1997. To limit short-circuit current in a power system are used______________?
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A. earth wires

B. H.R.C. fuses

C. isolators

D. reactors
1998. A keeper is used to_____________?
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A. restore lost flux

B. provide a closed path for flux

C. amplify flux

D. change the direction of magnetic lines

1999. The fuse wire, in D.C. circuits, is inserted in____________?
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A. negative circuit only

B. positive circuit only

C. both (A) and (B)

D. either (A) or (B)

2000. The advantage of mercury arc rectifier is that________________?
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A. it is comparatively noiseless

B. it has high overload capacity

C. it is light in weight and occupies small floor space

D. it has high efficiency

E. all of the above