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
6651. ICs are used in ______________?
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A. Linear devices only

B. Digital devices only

C. Both linear and digital devices

D. None of the above

6652. Digital ICs process______________?
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A. Linear signals only

B. Digital signals only

C. Both digital and linear signals

D. None of the above

6653. The active components in an IC are _______________?
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A. Capacitors

B. Transistors and diodes

C. Resistors

D. None of the above

6654. ___________ ICs are the most commonly used?
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A. Monolithic

B. Hybrid

C. Thin films

D. None of the above

6655. The most popular types of ICs are _________________?
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A. Thin-film

B. Thick-film

C. Hybrid

D. Monolithic
6656. The most popular form of IC package is _____________?
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A. None of the above

B. Flatpack

C. DIL

D. TO-5

6657. Operational amplifiers use ________________?
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A. Linear ICs

B. Digital ICs

C. Both linear and digital ICs

D. None of the above

6658. A transistor takes_____________ inductor on a silicon IC chip?
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A. More space than

B. Less space than

C. None of the above

D. Same space as

6659. We can control a.c. power in a load by connecting ______________?
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A. Two SCRs in parallel

B. None of the above

C. Two SCRs in parallel opposition

D. Two SCRs in series

6660. An SCR can exercise control over____________of a.c. supply?
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A. Positive half-cycles only

B. Negative half-cycles only

C. Both positive and negative half-cycles

D. Positive or negative half-cycles
6661. An SCR combines the features of ____________?
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A. A rectifier and resistance

B. None of the above

C. A rectifier and capacitor

D. A rectifier and transistor
6662. An SCR behaves as a____________switch?
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A. Bidirectional

B. Mechanical

C. Unidirectional

D. None of the above

6663. An SCR has __________ pn junctions?
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A. Two

B. Four

C. None of the above

D. Three
6664. An SCR is sometimes called ____________?
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A. Diac

B. Triac

C. Unijunction transistor

D. Thyristor
6665. An SCR is turned off by _________________?
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A. None of the above

B. Reverse biasing the gate

C. Reducing gate voltage to zero

D. Reducing anode voltage to zero
6666. An SCR is a solid state equivalent of ______________?
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A. Tetrode

B. Triode

C. Gas-filled triode

D. Pentode

6667. An SCR is a ____________ triggered device?
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A. Voltage

B. None of the above

C. Current

D. Voltage as well as current

6668. An SCR has three terminals viz ________________?
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A. Anode, cathode, grid

B. Cathode, anode, gate

C. None of the above

D. Anode, cathode, drain

6669. When an SCR is turned on, the voltage across it is about _____________?
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A. 1 V

B. 1 V

C. 10 V

D. Zero

6670. An SCR has ___________semiconductor layers?
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A. None of the above

B. Three

C. Two

D. Four
6671. When SCR starts conducting, then _____________ loses all control?
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A. Anode

B. None of the above

C. Gate

D. Cathode

6672. If firing angle in an SCR circuit is increased, the output _____________?
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A. None of the above

B. Remains the same

C. Is decreased

D. Is increased

6673. In normal operation of an SCR, gate is _____________w.r.t. cathode?
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A. None of the above

B. At zero potential

C. Negative

D. Positive
6674. When SCR is OFF, the current in the circuit is ________________?
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A. None of the above

B. Exactly zero

C. Small leakage current

D. Large leakage current

6675. In an SCR circuit the supply voltage is generally ___________ that of breakover voltage?
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A. Equal to

B. Greater than

C. None of the above

D. Less than
6676. The control element of an SCR is ______________?
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A. Anode

B. Anode supply

C. Gate

D. Cathode

6677. In an SCR circuit, the angle of conduction can be changed by__________________?
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A. None of the above

B. Changing gate voltage

C. Reverse biasing the gate

D. Changing anode voltage

6678. An SCR is made of_______________?
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A. Germanium

B. None of the above

C. Carbon

D. Silicon
6679. An SCR is turned off when ________________?
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A. Gate voltage is reduced to zero

B. None of the above

C. Anode current is reduced to zero

D. Gate is reverse biased

6680. The normal way to turn on a SCR is by______________?
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A. Breakover voltage

B. None of the above

C. Appropriate gate current

D. Appropriate anode current

6681. If gate current is increased, then anode-cathode voltage at which SCR closes_________________?
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A. Is increased

B. None of the above

C. Remains the same

D. Is decreased
6682. An SCR is made of silicon and not germanium because silicon _________________?
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A. Is mechanically strong

B. Has small leakage current

C. Is tetravalent

D. Is inexpensive

6683. In the normal operation of an SCR, anode is __________ w.r.t. cathode?
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A. Positive

B. Negative

C. At zero potential

D. None of the above

6684. In case of three core flexible cable the colour of the neutral is_________?
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A. none of the above

B. brown

C. black

D. blue
6685. In single core cables armouring is not done to________?
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A. either of the above

B. avoid excessive sheath losses

C. none of the above

D. make it flexible

6686. Polyethylene has very poor dielectric and ageing properties
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A. Yes

B. No
6687. The insulating material should have____________?
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A. low permittivity

B. all of the above

C. high resistivity

D. high dielectric strength

6688. If the length of a cable is doubled, its capacitance____________?
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A. becomes one-half

B. becomes one-fourth

C. becomes double

D. remains unchanged

6689. It is difficult to maintain oil filled cables____________?
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A. No

B. Yes
6690. In cables the charging current__________?
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A. leads the voltage by 90

B. leads the voltage by 180

C. lags the voltage by 180

D. lags the voltage by 90

6691. The disadvantage with paper as insulating material is____________?
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A. it has high capacitance

B. it is an organic material

C. it is hygroscopic

D. none of the above

6692. The relative permittivity of rubber is____________?
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A. between 5 and 6

B. between 12 and 14

C. between 8 and 10

D. between 2 and 3
6693. Rubber is most commonly used insulation in cables
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A. Yes

B. No

6694. The breakdown voltage of a cable depends on_____________?
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A. working temperature

B. all of the above

C. presence of moisture

D. time of application of the voltage

6695. Cables, generally used beyond 66 kV are___________?
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A. oil filled

B. belted

C. armoured

D. S.L. type

6696. The insulating material for cables should____________?
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A. have all above properties

B. be non-inflammable

C. be acid proof

D. be non-hygroscopic

6697. Empire tape is__________?
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A. impregnated paper

B. vulcanised rubber

C. none of the above

D. varnished cambric
6698. Which of the following insulation is used in cables ?
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A. Rubber

B. Any of the above

C. Paper

D. Varnished cambric

6699. cables are used for 132 kV lines____________?
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A. Super tension

B. High tension

C. Extra super voltage

D. Extra high tension

6700. Underground cables are laid at sufficient depth___________?
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A. for all of the above reasons

B. to minimize the effect of shocks and vibrations due to gassing vehicles, etc

C. to minimise temperature stresses

D. to avoid being unearthed easily due to removal of soil