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
601. Method which is commonly applied for unloading the coal for small power plant is___________?
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A. tower cranes

B. lift trucks

C. coal accelerators

D. belt conveyor

602. If the diversity factor of a power station is high then its generation cost is___________?
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A. depend on the plan type

B. high

C. remain same

D. low
603. The use of strain type insulators is made where the conductors are__________?
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A. at intermediate anchor towers

B. any of the above

C. dead ended

D. none of the above

604. Open circuit test on transformers is conducted to determine____________?
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A. core losses

B. hysteresis losses

C. copper losses

D. eddy current losses

605. In jet type condensers___________?
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A. steam and cooling water do not mix

B. cooling water passes through tubes and steam surrounds them

C. steam and cooling water mix

D. steam passes through tubes and cooling water surrounds them

606. Evaporative type of condenser has___________?
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A. water in pipes surrounded by steam

B. none of the above

C. steam in pipes surrounded by water

D. either A. or (b)

607. Constant voltage transmission entails the following disadvantage?
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A. either of the above

B. large conductor area is required for same power transmission

C. short-circuit current of the system is increased

D. none of the above

608. The commercial sources of energy are____________?
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A. wood, animal wastes and agriculture wastes

B. none of the above

C. fossil fuels, hydropower and nuclear energy

D. solar, wind and biomass

609. In a power or distribution transformer about 10 per cent end turns are heavily insulated__________?
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A. to absorb the line surge voltage and save the winding of transformer from damage

B. none of the above

C. to reflect the line surge and save the winding of a transformer from damage

D. to withstand the high voltage drop due to line surge produced by the shunting capacitance of the end turns
610. The wooden poles well impregnated with creosite oil or any preservative compound have life_____________?
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A. 60 to 70 years

B. from 2 to 5 years

C. 10 to 15 years

D. 25 to 30 years
611. For Parsons reaction steam turbine, degree of reaction is____________?
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A. 50%

B. 100%

C. 60%

D. 75%

612. Artificial draught is produced by____________?
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A. fan or steam jet

B. all of the above

C. steam jet

D. air fans

613. Where unpulverised coal has to be used and boiler capacity is large, the stoker which is used is______________?
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A. any

B. overfeed stoker

C. underfeed stoker

614. The material generally used for armour of high voltage cables is_____________?
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A. steel

B. copper

C. brass

D. aluminium

615. The corona is considerably affected by which of the following _______________?
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A. Surface condition of the conductor

B. All of the above

C. Size of the conductor

D. Shape of the conductor

616. The material commonly used for insulation in high voltage cables is_______________?
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A. rubber

B. none of the above

C. lead

D. paper
617. Which material is used to made a solar cell_______________?
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A. silicon

B. Germanium

C. scandium

D. aluminum

618. The noise produced by a transformer is termed as_______________________?
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A. ringing

B. buzz

C. zoom

D. hum
619. Auto-transformer makes effective saving on copper and copper losses, when its transformation ratio is_________________?
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A. less than one

B. approximately equal to one

C. none of the above

D. great than one

620. Which of the following power plant usually offer highest maintenance cost___________?
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A. Thermal power plants

B. Hydro-electric power plants

C. Diesel engine power plant

D. Nuclear power plants

621. Multicore cables generally use________________?
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A. none of the above

B. square conductors

C. circular conductors

D. rectangular conductors

E. sector-shaped conductors
622. Which of the following power plant has highest Depreciation charges?
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A. Diesel plant

B. Hydroelectric plant

C. All have same

D. Thermal plant
623. Which of the following power plant has least efficiency_________?
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A. Hydro power plant

B. Nuclear power plant

C. Steam power plant

D. Diesel power plant

624. By which of the following systems electric power may be transmitted ?
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A. Overhead system

B. Underground system

C. Both A. and (b)

D. None of the above

625. Which of the following characteristics should the line supports for transmission lines possess?
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A. Longer life

B. High mechanical strength

C. Low cost

D. All of the above
626. The draught in locomotive boilers is produced by_____________?
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A. chimney

B. only motion of locomotive

C. steam jet

D. forced fan

627. The ideal load factor should be_____________?
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A. negative.

B. infinity.

C. unity

D. zero

628. Transmission voltage of 11 kV is normally used for distances up to_____km?
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A. 80100 km

B. 2025 km

C. 6070 km

D. 4050 km

629. The energy radiated by sun on a bright sunny day is approximately______________?
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A. 2 kW/m2

B. 1 kW/m2

C. 800 W/m2

D. 700 W/m2

630. Which of the following distribution systems is more reliable?
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A. Ring main system

B. All are equally reliable

C. Tree system

D. Radial system

631. High voltage transmission lines use__________________?
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A. suspension insulators

B. pin insulators

C. both A. and B.

D. none of the above

632. Under-feed stokers work best for _________ coals high in volatile matter and with caking tendency?
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A. semibituminous and bituminous

B. lignite

C. anthracite

633. In a step-down transformer, there is a change of 15 A in the load current. This results in change of supply current of_________________?
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A. 15 A

B. less than 15 A

C. more than 15 A

D. none of the above

634. For the same draught produced the power of induced draught fan as compared to forced draught fan is___________?
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A. more

B. same

C. less

D. not predictable

635. Which of the following device is used to measure vacuum?
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A. Barometer

B. Hygrometer

C. U-tube manometer

D. Venturi metre

636. If variable part of annual cost on account of interest and depreciation on the capital outlay is equal to the annual cost of electrical energy wasted in the conductors, the total annual cost will be minimum and the corresponding size of conductor will be most economical. This statement is known as___________________?
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A. Faradays law

B. none of the above

C. Ohms law

D. Kelvins law

E. Kirchhoffs law

637. By which of the following methods string efficiency can be improved?
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A. Grading the insulator

B. Using long cross arm

C. None of the above

D. Any of the above

E. Using a guard ring

638. Rateau steam turbine is______________?
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A. reaction steam turbine

B. pressure compounded impulse steam turbine

C. velocity compounded impulse steam turbine

D. pressure velocity compounded steam turbine

639. Aluminium has a specific gravity of___________?
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A. 7.8

B. 2.7

C. 4.2

D. 1.5

640. Galvanised steel wire is generally used as______________?
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A. stay wire

B. earth wire

C. structural components

D. all of the above
641. Edwards air pump____________?
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A. removes only air from condenser

B. removes air alongwith vapour and also the condensed water from condenser

C. removes air and also vapour from condenser

D. removes only un-condensed vapour from condenser

642. When the interconnector between two stations has large reactance?
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A. the stations will fall out of step because of large angular displacement between the stations

B. the transfer of power will take place with voltage fluctuation and noise

C. none of the above

D. the transfer of power will take place with least loss

643. The skin effect of a conductor will reduce as the__________?
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A. permeability of conductor material increases

B. diameter increases

C. resistivity of conductor material increases

D. frequency increases

644. The draught produced by chimney of given height at given outside temperature___________?
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A. may increase or decrease

B. decreases if the chimney gas temperature increases

C. remains same irrespective of chimney gas temperature

D. increases if the chimney gas temperature increases
645. In hydro power plant, the graph between discharge and time is known as___________?
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A. monograph.

B. discharge graph.

C. load graph.

D. hydro graph
646. Which of the following insulating materials can withstand the highest temperature safely ?
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A. Asbestos

B. Glass fibre

C. Mica

D. Cellulose

647. The voltage of a single solar cells is about
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A. 0.5 volt

B. 1. 5 volt

C. 1.8 volt

D. 1 volt

648. In a given transformer for a given applied voltage, losses which remain constant irrespective of load changes are__________?
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A. none of the above

B. copper losses

C. hysteresis and eddy current losses

D. friction and windage losses

649. Which of the following acts as a protection against high voltage surges due to lightning and switching ?
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A. Conservator

B. Breather

C. Thermal overload relays

D. Horn gaps
650. Which of the following parts of a transformer is visible from outside ?
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A. Primary winding

B. Core

C. Secondary winding

D. Bushings