1) CFL means
a. Combustible fluoride lamp
b. Compact fluoride lamp
c. Compact fluorescent lamp
d. Combustible fluorescent lamp
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Answer
Explanation
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ANSWER: Compact fluorescent lamp
Explanation:
No explanation is available for this question!
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2) In fluorescent lamp one capacitor is connected across the lamp circuit and another is connected across the starter. Then
a. Both the capacitors are used for improving power factor
b. Both the capacitors are used for reducing radio interference
c. Former capacitors is used for improving power factor and later is used for reducing radio interference
d. Former capacitors is used for reducing radio interference and later is used for improving power factor
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Answer
Explanation
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ANSWER: Former capacitors is used for improving power factor and later is used for reducing radio interference
Explanation:
No explanation is available for this question!
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3) The main electrode of high pressure mercury vapour lamp is made up of
a. Quartz
b. Hard glass
c. Tungsten
d. Bronze
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Answer
Explanation
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ANSWER: Tungsten
Explanation:
No explanation is available for this question!
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4) The practical luminous efficiency of the sodium vapour lamp is of the order of
a. 25 to 40 lumens per watt
b. 40 to 45 lumens per watt
c. 45 to 50 lumens per watt
d. 60 to 67 lumens per watt
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Answer
Explanation
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ANSWER: 45 to 50 lumens per watt
Explanation:
No explanation is available for this question!
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5) The inside wall of fluorescent tube is coated with
a. Sulphur powder`
b. Phosphor powder
c. Sodium
d. Krypton
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Answer
Explanation
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ANSWER: Phosphor powder
Explanation:
No explanation is available for this question!
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6) Nitrogen is added with the argon in an incandescent lamp to
a. Reduce the temperature
b. Reduce the possibility of arcing
c. Increase the brightness
d. Increase the efficiency
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Answer
Explanation
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ANSWER: Reduce the possibility of arcing
Explanation:
No explanation is available for this question!
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7) The artificial source of light is
a. Arc lamp
b. Incandescent lamp
c. Discharge lamp
d. All of these
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Answer
Explanation
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ANSWER: All of these
Explanation:
No explanation is available for this question!
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8) The glare can be reduced by
a. Decreasing the height of bright light sources
b. Using glossy surfaces for bench tops
c. Using reflectors to the bright sources
d. All of these
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Answer
Explanation
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ANSWER: Using reflectors to the bright sources
Explanation:
No explanation is available for this question!
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9) Flood lighting is used for
a. For enhancing the beauty of building at nights
b. For illuminating sports stadium
c. For illuminating show cases
d. All of these
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Answer
Explanation
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ANSWER: All of these
Explanation:
No explanation is available for this question!
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10) The suitable lamps for street lighting are
a. Mercury vapour lamps
b. Sodium discharge lamps
c. Both (a) and (b)
d. None of these
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Answer
Explanation
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ANSWER: Both (a) and (b)
Explanation:
No explanation is available for this question!
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