1) Maintenance factor is the ratio of
a. Lumens on the working plane under normal working conditions to the lumens on the working plane under ideal condition
b. Lumens on the working plane under ideal working conditions to the lumens on the working plane under normal condition
c. Lumens falling on the working plane to the lumens emitted by the working plane under ideal condition
d. Lumens emitting by the working plane to the lumens falling on the working plane under ideal condition
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Answer
Explanation
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ANSWER: Lumens on the working plane under normal working conditions to the lumens on the working plane under ideal condition
Explanation:
No explanation is available for this question!
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2) For avoiding hard and long shadows,
a. Large number of small luminaries mounted at a height of less than 2.5 m can be used
b. Large number of small luminaries mounted at a height of not less than 2.5 m can be used
c. Small number of small luminaries mounted at a height of less than 2.5 m can be used
d. Small number of large luminaries mounted at a height of not less than 2.5 m can be used
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Answer
Explanation
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ANSWER: Large number of small luminaries mounted at a height of not less than 2.5 m can be used
Explanation:
No explanation is available for this question!
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3) For best visual performance, the range of brightness within the field of vision
a. Should be less than 3:1
b. Should be greater than 3:1
c. Should be less than 1:3
d. Should be greater than 1:3
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Answer
Explanation
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ANSWER: Should be less than 3:1
Explanation:
No explanation is available for this question!
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4) The polar curves are used to find out the
a. MHCP
b. MSCP
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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5) According to the first law of illumination, the illumination of a surface due to a source of light is
a. Inversely proportional to the distance between the surface and the source of light
b. Inversely proportional to the square of the distance between the surface and the source of light
c. Directly proportional to the distance between the surface and the source of light
d. Directly proportional to the square of the distance between the surface and the source of light
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Answer
Explanation
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ANSWER: Inversely proportional to the square of the distance between the surface and the source of light
Explanation:
No explanation is available for this question!
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6) According to second law of illumination, the illumination at any point on an inclined surface is
a. Directly proportional to the cosine of the angle between the normal to the surface at that point
b. Directly proportional to the sin of the angle between the normal to the surface at that point
c. Directly proportional to the tan of the angle between the normal to the surface at that point
d. Directly proportional to the cot of the angle between the normal to the surface at that point
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Answer
Explanation
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ANSWER: Directly proportional to the cosine of the angle between the normal to the surface at that point
Explanation:
No explanation is available for this question!
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7) Reduction factor of a source of light is the ratio of its
a. Mean horizontal candle power to the mean spherical candle power
b. Mean spherical candle power to the mean horizontal candle power
c. Maximum horizontal candle power to the mean spherical candle power
d. Mean spherical horizontal candle power to the maximum spherical candle power
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Answer
Explanation
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ANSWER: Mean spherical candle power to the mean horizontal candle power
Explanation:
No explanation is available for this question!
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8) Lux is the unit of
a. Luminous flux
b. Luminous intensity
c. Illumination
d. Luminance
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Answer
Explanation
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ANSWER: Illumination
Explanation:
No explanation is available for this question!
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9) The range of visible radiation lies between
a. 2000 angstrom to 2500 angstrom
b. 4000 angstrom to 4500 angstrom
c. 5000 angstrom to 6000 angstrom
d. 4000 angstrom to 7500 angstrom
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Answer
Explanation
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ANSWER: 4000 angstrom to 7500 angstrom
Explanation:
No explanation is available for this question!
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10) With increase in temperature of the body, the emission of light waves is
a. Increases
b. Decreases
c. Remains same
d. None of these
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Answer
Explanation
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ANSWER: Increases
Explanation:
No explanation is available for this question!
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