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
1901. As per Faradays laws of electromagnetic induction, an e.m.f. is induced in a conductor whenever it_______________?
comments icon0

A. moves parallel to the direction of the magnetic field

B. cuts magnetic flux

C. lies in a magnetic field

D. lies perpendicular to the magnetic flux

1902. capacitors are used for audio frequency and radio frequency coupling and tuning ?
comments icon0

A. Plastic film

B. Air

C. Mica

D. Ceramic

1903. In selenium rectifiers efficiencies ranging from _______ to _______ percent are attainable?
comments icon0

A. 60, 70

B. 25, 35

C. 75, 85

D. 40, 50

1904. Which is the most superior dielectric out of the following ?
comments icon0

A. Glass

B. Air

C. Paper

D. Bakelite
1905. The potential gradient across the material of low permittivity is than across the material of high permittivity?
comments icon0

A. smaller

B. greater

C. both (A) and (B)

D. none of the above

1906. Reversing the field or the current will reverse the force on the conductor
comments icon0
A. Yes

B. No

1907. The property of a material which opposes the creation of magnetic flux in it is known as_____________?
comments icon0

A. reluctivity

B. permeance

C. reluctance

D. magnetomotive force

1908. Permanent magnets are normally made of_____________?
comments icon0

A. cast iron

B. aluminium

C. wrought iron

D. alnico alloys
1909. Current changing from 8 A to 12 A in one second induced 20 volts in a coil. The value of inductance is___________?
comments icon0
A. 5 H

B. 5 mH

C. 10 mH

D. 10 H

1910. If an ohmmeter reading immediately goes practically to zero and stays there, capacitor is___________?
comments icon0

A. lossy

B. charged

C. short-circuited

D. satisfactory

1911. Higher the self-inductance of a coil_____________?
comments icon0

A. lower the e.m.f. induced

B. longer the delay in establishing steady current through it

C. greater the flux produced by it

D. lesser its weber-turns

1912. Two plates of a parallel plate capacitor after being charged from a constant voltage source are separated apart by means of insulated handles, then the____________?
comments icon0
A. voltage across the plates decreases

B. charge on the capacitor decreases

C. Voltage across the plates increases

D. charge on the capacitor increases

1913. A capacitor in a circuit became hot and ultimately exploded due to wrong connections, which type of capacitor it could be ?
comments icon0

A. Ceramic capacitor

B. Electrolytic capacitor

C. Any-of the above

D. Paper capacitor

1914. Which of the following circuit elements will oppose the change in circuit current ?
comments icon0

A. Resistance

B. Inductance

C. All of the above

D. Capacitance

1915. In an iron cored coil the iron core is removed so that the coil becomes an air cored coil. The inductance of the coil will_____________?
comments icon0

A. increase

B. remain the same

C. decrease

D. initially increase and then decrease

1916. While preparing electrolyte for a lead-acid battery___________?
comments icon0

A. anyone of the two can be added to other chemical

B. acid is poured into water

C. water is poured into acid

1917. Which of the following material has least value of dielectric constant ?
comments icon0

A. Ceramics

B. Glass

C. Oil

D. Paper

1918. A single core cable used on 33000 V has conductor diameter 10 mm and the internal diameter of sheath 25 mm. The maximum electrostatic stress in the cable is____________?
comments icon0
A. 72 x 105 V/m

B. 62 x 105 V/m

C. 92 x 105 V/m

D. 82 x 105 V/m

1919. While testing a capacitor with ohm meter, if the capacitor shows charging, but the final resistance reading is appreciably less than normal, it can be concluded that the capacitor is____________?
comments icon0

A. short-circuited

B. alright

C. open circuited

D. leaky
1920. Paper condenser is___________?
comments icon0

A. electrolytic condenser

B. always polarised

C. a variable condenser

D. usually of fixed value
1921. Point out the wrong statement. Magnetic leakage is undesirable in electric machines because it___________?
comments icon0

A. produces fringing

B. lowers their power efficiency

C. leads to their increased weight

D. increases their cost of manufacture

1922. Which of the following capacitors has relatively shorter shelf life____________?
comments icon0

A. Ceramic capacitor

B. Paper capacitor

C. Electrolytic capacitor

D. Mica capacitor

1923. In a capacitor the electric charge is stored in____________?
comments icon0

A. metal plates

B. dielectric

C. both (A) and (B)

D. none of the above

1924. Which of the following is not a vector ___________?
comments icon0

A. Linear momentum

B. Angular momentum

C. Electric field

D. Electric potential

1925. The applications of selenium rectifiers are usually limited to potential of_____________?
comments icon0

A. 200 V

B. 10 V

C. 30 V

D. 100 V

E. 60 V

1926. Which of the following statements is incorrect _________________?
comments icon0

A. The leakage resistance of ceramic capacitors is generally high

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

C. A wire cable has distributed capacitance between the conductors

D. The stored energy in a capacitor decreases with reduction in value of capacitance
1927. If the area of hysteresis loop of a material is large, the hysteresis loss in this material will be____________?
comments icon0

A. small

B. none of the above

C. large

D. zero

1928. The rate of rise of current through an inductive coil is maximum_____________?
comments icon0

A. after one time constant

B. near the final maximum value of current

C. at 63.2% of its maximum steady value

D. at the start of the current flow
1929. Which of the following circuit element stores energy in the electromagnetic field ?
comments icon0

A. Resistance

B. Inductance

C. Condenser

D. Variable resistor

1930. Acharge which when placed in vacuum from an equal and similar charge repels with a force of 9 x 10 N, is known as_____________?
comments icon0

A. pico-coulomb

B. milli-coulomb

C. micro-coulomb

D. coulomb

1931. The relative permittivity of free space is given by__________?
comments icon0

A. 10

B. 1

C. 1000

D. 100

1932. If a 6 uF capacitor is charged to 200 V, the charge in coulombs will be____________?
comments icon0
A. 1200 uC

B. 900 uC

C. 1600 uC

D. 800 uC

1933. The unit of magnetic flux is______________?
comments icon0

A. henry

B. weber

C. ampere/metre

D. ampereturn/weber

1934. A potential of 400 V is applied to a capacitor, the plates of which are 4 mm apart. The strength of electric field is___________?
comments icon0
A. 100 kV/m

B. 10 kV/m

C. 5 kV/m

D. 2 kV/m

1935. A coil is wound on iron core which carries current I. The self-induced voltage in the coil is not affected by________________?
comments icon0

A. the resistance of magnetic path

B. variation in voltage to the coil

C. variation in coil current

D. change of number of turns of coil

1936. The relative permeability of a ferromagnetic material is_____________?
comments icon0

A. less than one

B. more than 10

C. more than one

D. more than 100 or 1000
1937. Both the number of turns and the core length of an inductive coil are doubled. Its self-inductance will be_____________?
comments icon0
A. doubled

B. unaffected

C. halved

D. quadrupled

1938. In the case of a lossy capacitor, its series equivalent resistance value will be_______________?
comments icon0

A. zero

B. large

C. small

D. very small

1939. The capacitor preferred for high frequency circuits is_____________?
comments icon0

A. electrolytic capacitor

B. none of the above

C. mica capacitor

D. air capacitor

1940. In a cable capacitor, voltage gradient is maximum at the surface of the______________?
comments icon0

A. sheath

B. insulator

C. earth

D. conduction
1941. Which of the following capacitor is preferred in case of single phase motor ?
comments icon0

A. Ceramic capacitor

B. Mica capacitor

C. Electrolytic capacitor

D. Paper capacitor

1942. Dielectric constant for mica is nearly_____________?
comments icon0

A. 100

B. 1 to 2

C. 3 to 8

D. 200

1943. Which of the following statement is incorrect ?
comments icon0

A. Copper oxide rectifier has a low efficiency

B. Copper oxide rectifier is not a perfect rectifier

C. Copper oxide rectifier is a linear device

D. Copper oxide rectifier finds use in control circuits

E. Copper oxide rectifier is not stable during early life

1944. A constant-voltage generator has___________?
comments icon0
A. low internal resistance

B. minimum efficiency

C. minimum current capacity

D. high internal resistance

1945. If ground is applied to the (+) terminal of an inverting op-amp, the () terminal will_____________?
comments icon0

A. Not invert the signal

B. Have high reverse current

C. Not need an input resistor

D. Be virtual ground
1946. If the fault occurs near the impedance relay, the VII ratio will be____________?
comments icon0
A. lower than that of if fault occurs away from the relay

B. higher than that of if fault occurs away from the relay

C. none of the above

D. constant for all distances

1947. Which of the following medium is employed for extinction of arc in air circuit breaker?
comments icon0
A. Air

B. SF6

C. Oil

D. Water

1948. The initial permeability of an iron rod is________________?
comments icon0

A. the highest permeability of the iron rod

B. the lowest permeability of the iron rod

C. the permeability almost in non-magnetised state

D. the permeability at the end of the iron rod

1949. Shunt capacitance is neglected while considering______________?
comments icon0

A. medium transmission line

B. long transmission line

C. medium and long transmission lines

D. short transmission line
1950. Which of the following devices will receive voltage surge first travelling on the transmission line ?
comments icon0

A. Relays

B. Lightning arresters

C. Step-down transformer

D. Switchgear