APPLIED MECHANICS AND GRAPHIC STATICS QUIZ

Which lamp is best suited for lighting an International sports arena?

Incandescent

LED

Compact Fluorescent

Metal Halide

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What will be the number of lamps, each having 300 lumens, required to obtain an average illuminance of 50 lux on a 4m × 3m rectangular room?

2

5

6

4

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The illumination of the surface varies directly with cosine of the angle between normal to surface and direction of the inclined light is given by

None of these

Lambert’s cosine law.

both A and B.

law of square inverse.

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Unit of luminous flux is

steradians.

lux.

candela.

lumens.

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Illumination can be expressed in

lumens.

radians.

lux.

candela.

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What is the work of a driver in case of an LED?

None of these

To convert AC to DC

To convert DC to AC

Both ‘a’ and ‘b’

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Candela is the unit of which?

Luminous intensity.

Wavelength.

Frequency.

Luminous flux.

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Solid angle is expressed in terms of

degree.

steredians.

radians / meter.

radians.

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What is the ratio of illuminance at a point 5m just below a lamp emitting 100 candelas and at a point 5m away from the first point on the same horizontal plane?

2:1

2√2 : 1

1:2

1: 2√2

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What will be the total flux emitted by a source of 60 candle power?

754.2 lumens.

None of these.

0.001326 lumens.

60 lumens.

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