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
6301. If the diversity factor of a power station is high then its generation cost is___________?
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A. high

B. low

C. remain same

D. depend on the plan type

6302. Which of the following device is used to measure vacuum?
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A. Hygrometer

B. Barometer

C. U-tube manometer

D. Venturi metre

6303. Which of the following power plant has least fuel transportation______________?
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A. diesel generating plants

B. nuclear power plants

C. steam power stations

D. thermal power plants

6304. Compounding of steam turbine is done for_______________?
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A. balancing the turbine

B. reducing the rotor speed

C. reducing the work done

D. increasing the rotor speed

6305. Demand factor is defined as___________?
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A. connected load/maximum demand.

B. average load/maximum load.

C. maximum demand/connected load

D. average load x maximum load

6306. Load curve is useful in deciding the__________?
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A. sizes of generating units

B. A. operating schedule of generating units

C. total installed capacity of the plant

D. all of the above
6307. Which of the following load is responsible for lower power factor of supply system__________?
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A. synchronous Motors

B. all of the above

C. induction motors

D. resistive loads

6308. Which of the following power plant usually offer highest maintenance cost___________?
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A. Hydro-electric power plants

B. Thermal power plants

C. Diesel engine power plant

D. Nuclear power plants

6309. 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
6310. Which of the following power plant has highest Depreciation charges?
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A. All have same

B. Thermal plant

C. Diesel plant

D. Hydroelectric plant

6311. The value of the reheat factor is of the order of_____________?
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A. 1.0 to 1.05

B. 0.8 to 1.0

C. above 1.5

D. 1.1 to 1.5
6312. In thermal power plant, heat from the flue gases is utilized in___________?
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A. chimney

B. super heater

C. economizer

D. condenser

6313. Which material is used to made a solar cell_______________?
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A. scandium

B. silicon

C. aluminum

D. Germanium

6314. A gas turbine basically work on
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A. Dual cycle

B. Rankin cycle

C. Brayton cycle

D. Carnot cycle

6315. One kilowatt hour is equal to_________?
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A. 735 k cal.

B. 860 k cal.

C. 746 k cal.

D. 532 k cal.

6316. The ideal load factor should be_____________?
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A. negative.

B. infinity.

C. zero

D. unity
6317. Diesel power plant are generally used as___________?
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A. base load plant

B. peak load plant

C. standby plant

D. none of the above

6318. The overall efficiency of a steam power station is ________ its thermal efficiency.
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A. none of the above

B. greater than

C. less than

D. equal to

6319. Which of the following power plant has least efficiency_________?
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A. Steam power plant

B. Hydro power plant

C. Diesel power plant

D. Nuclear power plant

6320. The fuel used in nuclear reactor is_____________?
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A. all of the above

B. cadmium

C. radium

D. uranium
6321. The voltage of a single solar cells is about
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A. 1. 5 volt

B. 1 volt

C. 1.8 volt

D. 0.5 volt
6322. A steam power stations basically work on the______________?
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A. thermodynamic cycle

B. Vapor pressure cycle

C. Carton cycle

D. Rankin cycle
6323. The percentage 02 by volume in atmosphere air is____________?
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A. 77%

B. 79%

C. 21%

D. 23%

6324. The cooling section in the surface condenser__________?
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A. does not affect vapour quantity extracted but reduces pump capacity of air extraction pump

B. increases the quantity of vapour extracted along with air

C. reduces the quantity of vapour extracted along with air

D. none of the above

6325. The ratio of exit pressure to inlet pressure for maximum mass flow rate per unit area of steam through a nozzle when steam is initially dry saturated is___________?
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A. 0.555

B. 0.6

C. 0.5457

D. 0.578
6326. The pressure at the furnace is minimum in case of___________?
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A. forced draught system

B. natural draught system

C. balanced draught system

D. induced draught system

6327. The amount of air which is supplied for complete combustion is called___________?
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A. primary air

B. tertiary air

C. secondary air
6328. Load carrying capacity of belt conveyor is about___________?
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A. 100 to 150 tonnes/hr

B. 20 to 40 tonnes/hr

C. 50 to 100 tonnes/hr

D. 150 to 200 tonnes/hr

6329. The isentropic expansion of steam through nozzle for the steam initially superheated at inlet is approximated by equation__________?
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A. pv = C

B. pv1126 = C

C. pv1A = C

D. pvls=C
6330. The proper indication of incomplete combustion is_______________?
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A. high CO content in flue gases at exit

B. high CO2 content in flue gases at exit

C. the smoking exhaust from chimney

D. high temperature of flue gases

6331. The value of reheat factor normally varies from___________?
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A. 1.02 to 1.06

B. 0.9 to 0.95

C. 1.2 to 1.6

D. 0.5 to 0.6

6332. Economiser is used to heat_____________?
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A. all above

B. air

C. feed water

D. flue gases

6333. Where unpulverised coal has to be used and boiler capacity is large, the stoker which is used is______________?
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A. underfeed stoker

B. overfeed stoker

C. any

6334. Rankine cycle efficiency of a good steam power plant may be in the range of____________?
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A. 35 to 45 per cent

B. 70 to 80 per cent

C. 15 to 20 per cent

D. 90 to 95 per ceut

6335. In case of impulse steam turbine_____________?
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A. there is enthalpy drop only in moving blades

B. there is enthalpy drop in nozzles

C. there is enthalpy drop in fixed and moving blades

D. none of the above

6336. In _________ system fuel from a central pulverizing unit is delivered to a bunker and then to the various burners?
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A. unit

B. none of the above

C. central
6337. Caking coals are those which__________?
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A. do not form ash

B. burn completely

C. burn freely

D. form lumps or masses of coke
6338. Steam pressure in a steam power station, which is usually kept now-a-days is of the order of____________?
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A. 50 kgf/cm2

B. 100 kgf/cm2

C. 20 kgf/cm2

D. 150 kgf/cm2
6339. The thermal efficiency of the engine with condenser as compared to without condenser, for a given pressure and temperature of steam, is_____________?
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A. lower

B. higher

C. none of the above

D. same as long as initial pressure and temperature is unchanged

6340. For the safety of a steam boiler the number of safety valves fitted are____________?
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A. one

B. four

C. two

D. three

6341. Carnot cycle comprises of_______?
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A. two isothermal processes and three constant pressure processes

B. none of the above

C. two isentropic processes and two constant pressure processes

D. two isentropic processes and two constant volume processes

6342. Under-feed stokers work best for _________ coals high in volatile matter and with caking tendency?
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A. anthracite

B. lignite

C. semibituminous and bituminous
6343. The capacity of large turbo-generators varies from___________?
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A. 20 to 100 MW

B. 50 to 300 MW

C. 70 to 400 MW

D. 100 to 650 MW

6344. The draught produced by chimney of given height at given outside temperature___________?
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A. decreases if the chimney gas temperature increases

B. increases if the chimney gas temperature increases

C. remains same irrespective of chimney gas temperature

D. may increase or decrease

6345. In a regenerative feed heating cycle, the optimum value of the fraction of steam extracted for feed heating________________?
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A. is unaffected by increase in Rankine cycle efficiency

B. decreases with increase in Rankine cycle efficiency

C. none of the above

D. increases with increase in Rankine cycle efficiency
6346. Deaerative heating is done to_____________?
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A. remove dissolved gases in the water

B. heat the air in the water

C. heat the water

D. erative heating is done to

6347. In regenerative cycle feed water is heated by_____________?
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A. exhaust gases

B. heaters

C. draining steam from the turbine

D. all above

6348. The main source of production of biogas is__________________?
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A. all above

B. human waste

C. wet cow dung

D. wet livestock waste

6349. The artificial draught normally is designed to produce____________?
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A. less smoke

B. all of the above

C. more draught

D. less chimney gas temperature

6350. Method which is commonly applied for unloading the coal for small power plant is___________?
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A. lift trucks

B. belt conveyor

C. coal accelerators

D. tower cranes