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
3701. Which one of the following can be taken as the measure of electric intensity ?
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A. q/VA

B. VF/A

C. F/A

D. V/A
3702. select the correct statement?
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A. they do not cross each other and group together in dielectric

B. they expand laterally and contract longitudinally

C. the electric lines of force have no physical existence

D. all the above statements are true
3703. 1 Coulomb = ___________ e.
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A. 610<sup>-19</sup>

B. 6.251018

C. 1.610<sup>19</sup>

D. 6.2510<sup>-18</sup>

3704. Solid Grounding is used for Voltages?
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A. Below 115 v

B. Above 11kv

C. Above 220 kv

D. Below 660 v
3705. A turbine is tripped when ?
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A. speed shoots up

B. steam flow gets clogged

C. inlet pressure increase

D. exhaust gets choked

3706. Farad is the unit of___________?
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A. capacitance

B. inductance

C. voltage

D. None of these

3707. Which of the following is the major consideration to evolve a good design?
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A. Compliance with performance criteria as laid down in specifications

B. All of the above

C. Durability

D. Cost

3708. select the only wrong statement?
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A. similar charges repel each other

B. dissimilar charges attract each other

C. repulsion is the sure test of electrification

D. an electrically neutral body is repelled both positively and negatively charged bodies
3709. In Hopkinson demand rate or two part tariff the demand rate or fixed charges are__________?
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A. dependent upon the energy consumed

B. dependent upon the maximum demand of the consumer

C. both A and B

D. neither A nor B

3710. For a consumer the most economical power factor is generally____________?
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A. 0.5 lagging

B. 0.95 lagging

C. 0.5 leading

D. 0.95 leading

3711. The knowledge of diversity factor helps in determining__________?
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A. average load

B. kWh generated

C. peak load

D. plant capacity
3712. Which of the following is the disadvantage of a synchronous condenser?
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A. High maintenance cost

B. All of the above

C. Continuous losses in motor

D. Noise

3713. The expected useful life of an hydroelectric power station is around_________________?
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A. 60 years

B. 100 years

C. 15 years

D. 30 years

3714. The load factor of domestic load is usually____________?
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A. 30 to 40%

B. 10 to 15%

C. 60 to 70%

D. 50 to 60%

3715. Which lightening stroke is most dangerous?
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A. Indirect stroke on conductor

B. Direct stroke on tower top

C. Direct stroke on ground wire

D. Direct stroke on line conductor
3716. Annual instalment towards depreciation reduces as rate of interest increases with______________?
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A. straight line depreciation

B. none of the above

C. reducing balances depreciation

D. sinking fund depreciation
3717. Generating capacity connected to the bus bars and ready to take load when switched on is known as____________?
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A. spinning reserve

B. cold reserve

C. hot reserve

D. firm power

3718. Most efficient plants are normally used as____________?
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A. base load plants

B. none of the above

C. peak load plants

D. either A. or (b)

3719. In a distribution system, in order to improve power factor, the synchronous capacitors are installed__________?
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A. either A. or (b)

B. at the sending end

C. none of the above

D. at the receiving end
3720. An alternator coupled to a __________ runs at slow speed, as compared to as compared to others.
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A. hydraulic turbine

B. gas turbine

C. diesel engine

D. steam turbine

3721. A consumer has to pay lesser fixed charges in____________?
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A. two part tariff

B. flat rate tariff

C. any of the above

D. maximum demand tariff
3722. Approximate estimation of power demand can be made by_____________?
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A. economic parameters

B. load survey method

C. statistical methods

D. mathematical method

E. all of the above
3723. When the demand of consumers is not met by a power plant, it will resort to which of the following?
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A. Load shedding

B. Power factor improvement at the , generators

C. Penalising high load consumers by increasing the charges for electricity

D. Efficient plant operation

3724. For high value of diversity factor, a power station of given installed capacity will be in a position to supply?
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A. neither A. nor B.

B. less number of consumers

C. either A. or B.

D. more number of consumers
3725. Low power factor is usually not due to___________?
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A. fluorescent tubes

B. induction motors

C. incandescent lamp

D. arc lamps

3726. Which of the following is the essential requirement of peak load plant ?
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A. It should produce high voltage

B. It should be small in size

C. It should be capable of starting quickly

D. It should run at high speed

3727. Which of the following component, in a steam power plant, needs maximum maintenance attention?
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A. Steam turbine

B. Condenser

C. Water treatment plant

D. Boiler
3728. Which of the following is not a source of power?
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A. Photovoltaic cell

B. Photoelectric cell

C. Solar cell

D. Thermocouple
3729. Load curve helps in deciding___________?
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A. all of the above

B. sizes of the generating units

C. total installed capacity of the plant

D. operating schedule of generating units

3730. In whichof the following power plants the maintenance cost is usually high?
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A. Diesel engine power plants

B. Thermal power plants

C. Nuclear power plant

D. Hydro-electric power plants

3731. The connected load of a IVMIM uir consumer is around___________?
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A. 120 kW

B. 80 kW

C. 5 kW

D. 40 kV

3732. In a load curve the highest point represents______________?
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A. average demand

B. diversified demand

C. none of the above

D. peak demand
3733. High load factor indicates
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A. either of the above

B. none of the above

C. average power used during the period

D. average kWh (kW) energy consumption during the period
3734. The efficiency of a plant is of least concern when it is selected as___________?
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A. casual run plant

B. peak load plant

C. base load plant

D. either A. or (b)
3735. Which of the following should be used for extinguishing electrical fires?
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A. CO2 fire extinguisher

B. Foam type fire extinguisher

C. Carbon tetrachloride fire extinguisher

D. Water

3736. An induction motor has relatively high power factor at__________?
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A. 20 percent load

B. near full load

C. no load

D. rated r.p.m.

3737. __________ is invariably used for peak load
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A. Pumped storage plant

B. None of the above

C. Nuclear power plant

D. Steam turbine plant

3738. Large capacity generators are invariably___________?
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A. forced air cooled

B. water cooled

C. natural air cooled

D. hydrogen cooled
3739. A pilot exciter is provided on generators for which of the following reasons?
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A. To provide requisite starting torque to generator

B. None of the above

C. To excite the poles of main exciter

D. To provide requisite starting torque to main exciter

3740. In two part tariff, variation in load factor will affect____________?
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A. fixed charges

B. operating or running charges

C. both A. and (b)

D. either A. or (b)

3741. By the use of which of the following power factor can be improved?
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A. Static capacitors

B. Phase advancers

C. Synchronous compensators

D. Any of the above
3742. Ships are generally powered by___________?
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A. diesel engines

B. none of the above

C. hydraulic turbines

D. nuclear power plants

E. steam accumulators

3743. A synchronous condenser is virtually which of the following?
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A. Over excited synchronous motor

B. Induction motor

C. Under excited synchronous motor

D. D.C. generator

3744. Depreciation charges are high in case of__________?
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A. thermal plant

B. hydroelectric plant

C. diesel plant

D. none of these

3745. An over excited synchronous motor on no load is known as__________?
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A. alternator

B. synchronous condenser

C. generator

D. induction motor

3746. In a power plant if the maximum demand on the plant is equal to the plant capacity, then
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A. diversity factor will be unity

B. plant reserve capacity will be zero

C. load factor will be nearly 60%

D. load factor will be unity

3747. Which plant can never have 100 percent load factor?
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A. Peak load plant

B. Nuclear power plant

C. Base load plant

D. Hydro electric plant

3748. In case of _________ fuel transportation is the major problem.
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A. thermal power plants

B. diesel power plants

C. hydro-electric power plants

D. nuclear power plants

3749. __________ will be least affected due to charge in supply voltage frequency.
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A. Mixer grinder

B. Room heater

C. Electric clock

D. Ceiling fan

3750. Which of the following is not an operating cost?
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A. Fuel cost

B. Maintenance cost

C. Salaries of high officials

D. Salaries of operating staff