Q21. | Which of the following applications does not need ultraviolet lamps ? | ||||||
A. | Car lighting [Correct Answer] |
B. | Medical purposes [Wrong Answer] |
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C. | Blue print machines [Wrong Answer] |
D. | Aircraft cockpit dashboard lighting [Wrong Answer] |
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Q22. | Which of the following is present inside the fluorescent tube ? | ||||||
A. | Argon and neon [Wrong Answer] |
B. | Argon and CO2 [Wrong Answer] |
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C. | Mercury vapour [Correct Answer] |
D. | Helium and oxygen [Wrong Answer] |
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Q23. | In incandescent lamps, coiled coil filaments are used for | ||||||
A. | coloured lamps [Wrong Answer] |
B. | higher wattage lamps [Wrong Answer] |
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C. | gas filled lamps [Correct Answer] |
D. | low wattage lamps [Wrong Answer] |
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Q24. | Illumination of one lumen per square metre is called | ||||||
A. | lumen metre [Wrong Answer] |
B. | lux [Correct Answer] |
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C. | foot candle [Wrong Answer] |
D. | candela [Wrong Answer] |
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Q25. | In houses the illumination is in the range of | ||||||
A. | 2-5 lumens/watt [Wrong Answer] |
B. | 10-20 lumens/watt [Wrong Answer] |
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C. | 35-45 lumens/watt [Wrong Answer] |
D. | 60-65 lumens/watt [Correct Answer] |
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Q26. | The cost of a fluorescent lamp is more than that of incandescent lamp because of which of the following factors ? | ||||||
A. | More labour is required in its manufacturing [Wrong Answer] |
B. | Number of components used is more [Wrong Answer] |
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C. | Quantity of glass used is more [Wrong Answer] |
D. | All of the above factors [Correct Answer] |
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Q27. | ____ cannot sustain much voltage fluctuations. | ||||||
A. | Sodium vapour lamp [Wrong Answer] |
B. | Mercury vapour lamp [Wrong Answer] |
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C. | Incandescent lamp [Correct Answer] |
D. | Fluorescent lamp [Wrong Answer] |
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Q28. | For normal reading the illumination level required is around | ||||||
A. | 20-40 lumens/m2 [Wrong Answer] |
B. | 60-100 lumens/m2 [Correct Answer] |
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C. | 200-300 lumens/m2 [Wrong Answer] |
D. | 400-500 lumens/m2 [Wrong Answer] |
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Q29. | Which gas can be filled in GLS lamps ? | ||||||
A. | Oxygen [Wrong Answer] |
B. | Carbon dioxide [Wrong Answer] |
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C. | Xenon [Wrong Answer] |
D. | Any inert gas [Correct Answer] |
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Q30. | When an electric bulb is broken it produces bang, this is due to | ||||||
A. | vacuum inside the bulb [Correct Answer] |
B. | pressure of air in the bulb [Wrong Answer] |
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C. | pressure inside is equal to that outside [Wrong Answer] |
D. | none of the above [Wrong Answer] |
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