Quiznetik

Electric Energy Generation Utilization and Conservation | Set 1

1. Which of the following instruments is used for the comparison of candle powers of different sources?

Correct : C. photometer

2. The illumination at various points on a horizontal surface illuminated by the same source varies as

Correct : A. cos3θ

3. Floodlighting is NOT used for purposes.

Correct : A. reading

4. Which of the following lamp has minimum initial cost of installation but maximum running cost ?

Correct : A. incandescent

5. Candela is the unit of which of the following?

Correct : B. luminous intensity

6. Colour of light depends upon

Correct : C. both (a) and (b)

7. Illumination of one lumen per sq. metre is called

Correct : B. lux

8. A solid angle is expressed in terms of

Correct : C. steradians

9. The unit of luminous flux is .

Correct : B. lumen

10. Filament lamps operate normally at a power factor of

Correct : C. unity

11. The filament of a GLS lamp is made of

Correct : A. tungsten

12. Which of the following lamps is the cheapest for the same wattage?

Correct : C. gls lamp

13. On which of the following factors dies the depreciation or maintenance factor depend?

Correct : D. all of the above factors

14. For the same lumen output, the running cost of the fluorescent lamp is

Correct : B. less than that of filament lamp

15. The flicker effect of fluorescent lamps is more pronounced at

Correct : A. lower frequencies

16. ...... is a cold cathode lamp.

Correct : B. neon lamp

17. For normal reading the illumination level required is around

Correct : B. 60-100 lumens/m2

18. Which gas can be filled in GLS lamps?

Correct : D. any inert gas

19. Which of the following is not the type of refrigerant?

Correct : D. halo-helium refrigerants

20. The refrigerants which are first cooled by                    refrigerants and then used for cooling purposes are known as                        refrigerants.

Correct : B. primary, secondary

21. Which one of the following inorganic refrigerants is often used?

Correct : A. nh3

22. From the following refrigerants, which is one of the most stable refrigerants?

Correct : D. sulphur dioxide

23. In the presence of which of the following, Sulphur dioxide becomes corrosive?

Correct : C. water

24. is widely used in large industrial plants such as cold storages and ice plants as per the cost basis.

Correct : B. r – 717

25. Where is the reciprocating compressor mostly suitable?

Correct : B. small displacements and high condensing pressures

26. Which of the following is the condition to use two compressors in the refrigeration system?

Correct : C. the desired temperature is -50°c

27. Centrifugal compressors are used to handle                volume of refrigerant.

Correct : C. large

28. Which of the following cooling towers possess maximum heat transfer from air to water?

Correct : B. mechanical draft

29. Which of the following is true about the optimum effective temperature for human comfort?

Correct : C. lower in winter than in summer

30. When the heat stored in the body is                  the human body feels comfortable.

Correct : A. zero

31. Room air conditioners and packaged units are examples of

Correct : A. direct expansion systems

32. Which of the following types of filters used in the air conditioning system is made of cloth that is discarded on getting dirty?

Correct : B. dry filter

33. The process of extraction of the certain required amount of water from air is known as

Correct : D. dehumidification

34. Which of the following is capable of absorbing excess moisture from the air?

Correct : C. salts of calcium or ammonia

35. Magnetic materials are heated with the help of

Correct : A. hysteresis loss

36. In the indirect resistance heating method, heat is delivered to the charge

Correct : D. both (b) and (c).

37. Electric ovens using heating elements of........................... can produce temperatures up to 3000°C

Correct : B. graphite

38. Which of the following heating method is based on the transformer principle ?

Correct : C. induction heating

39. Which of the following furnace suffers from pinch effect?

Correct : B. core type induction furnace

40. The coreless induction furnace uses high-frequency electric supply in order to obtain high

Correct : B. eddy-current loss

41. Spot welding is used for

Correct : A. thin metal sheets

42. Which of the following is an advantages of heating by electricity?

Correct : B. higher efficiency

43. ...... has the highest value of thermal conductivity.

Correct : A. copper

44. ...... method has leading power factor

Correct : B. dielectric heating

45. Which of the following methods of heating is not dependent on the frequency of supply?

Correct : C. electric resistance heating

46. When a body reflects entire radiation incident on it, then it is known as

Correct : A. white body

47. For the transmission of heat from one body to another

Correct : A. temperature of the two bodies must be different

48. A perfect black body is one that

Correct : B. absorbs all incident radions

49. Heat is transferred simultaneously by condition, convection and radiation

Correct : A. inside boiler furnaces

50. The process of heat transfer during the re-entry of satellites and missiles, at very high speeds, into earth’s atmosphere is known as

Correct : A. ablation

51. Which of the following has the highest value of thermal conductivity?

Correct : C. solid ice

52. The basic electrical requirement in arc welding is that there should be

Correct : B. high open-circuit voltage

53. A.C. welding machine cannot be used for welding

Correct : A. mig

54. In electric welding, arc blow can be avoided by

Correct : C. using a.c. welding machines

55. The major disadvantage of carbon arc welding is that

Correct : A. there is occurrence of blow holes

56. The free-running speed of a train does NOT depend on the

Correct : A. duration of stops

57. Longer coasting period for a train results in

Correct : C. lower specific energy consumption

58. Skidding of a vehicle always occurs when

Correct : A. braking effort exceeds its adhesive weight

59. In India diesel locomotives are manufactured at

Correct : B. varanasi

60. The horsepower of steam locomotives is

Correct : B. 1500 to 2000

61. In tramways which of the following motors is used?

Correct : B. d.c. series motor

62. In a steam locomotive electric power is provided through

Correct : C. small turbo-generator

63. Which of the following drives is suitable for mines where explosive gas exists?

Correct : C. battery locomotive

64. In case of locomotives the tractive power is provided by

Correct : C. double cylinder, double acting steam engine

65. which of the following track is electrified

Correct : C. delhi-howrah

66. For which of the following locomotives the maintenance requirements are the least?

Correct : C. electric locomotives

67. For 600 V D.C. line for tramcars, brack is connected to

Correct : B. negative of the supply

68. In case of---------free running and coasting periods are generally long.

Correct : A. main-line service

69. The return circuit for tram cars is through

Correct : B. rails

70. Fuse is a piece of wire of a materi

Correct : B. low melting point

71. Earthing is necessary to give protection against

Correct : A. electric shock

72. Static UPS requires

Correct : C. both inverter and rectifier

73. No discontinuity is observed in case of

Correct : C. no break static ups configuration

74. Which is the material used to as anode in a lithium-ion battery?

Correct : B. aluminum foil coated with graphite

75. What is the total number of cells present in a 12-volt battery?

Correct : B. 6

76. Which of the following decreases within turn decreases the charging rate?

Correct : A. temperature

77. Which of the following causes the corrosion of terminals and clamps?

Correct : A. spilled electrolyte

78. Grounding transformer is used where neutral .........available

Correct : B. is not

79. In equipment grounding, the enclosure is connected to ...........wire

Correct : A. ground

80. Earthing is necessary to give protection against

Correct : A. danger of electric shock

81. In case of earth fault, the underground neutral system                    lead to arcing ground

Correct : A. does

82. The advantage of neutral earthing

Correct : C. elimination of arcing ground

83. In a substation the equipment used to limit short circuit current level is

Correct : A. series reactor

84. In a star connected system without neutral grounding, zero sequence currents are

Correct : A. zero

85. Grounding transformer is used where neutral                  available

Correct : B. is not

86. Ground resistance value for sensitive installations is

Correct : A. less than 5 Ω