ILLUMINATION QUIZ

From a uniform light source having luminous intensity of 300 candelas, there exists a plane surface 15 m below. The value of illuminance at a point on the plane surface where the luminous flux rays are inclined at an angle of 30 to the surface is

17.32 lux.

1.53 lux.

1.15 lux.

58.45 Kilolux.

TRUE ANSWER : ?
YOUR ANSWER : ?

Which among the following lamps has the maximum burning hours?

LED.

Compact Fluorescent.

Metal halide.

Incandescent.

TRUE ANSWER : ?
YOUR ANSWER : ?

Wave length for red colour is around

400 nm.

700 nm.

500 nm.

600 nm.

TRUE ANSWER : ?
YOUR ANSWER : ?

Solid angle is expressed in terms of

degree.

steredians.

radians.

radians / meter.

TRUE ANSWER : ?
YOUR ANSWER : ?

Which lamp has the best Colour Rendering Index (CRI)?

High pressure sodium vapour

LED

Fluorescent

Incandescent

TRUE ANSWER : ?
YOUR ANSWER : ?

Luminous efficacy of a typical HPSV lamp is in between

120 - 200 lm/watt.

10 - 40 lm/watt

40 - 70 lm/watt.

70 - 120 lm/watt.

TRUE ANSWER : ?
YOUR ANSWER : ?

Illumination can be expressed in

lumens.

candela.

lux.

radians.

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___________________________ factor is defined as the ratio of the illumination when everything is clean to illumination under normal working conditions.

Depreciation.

Maintenance.

Absorption factor.

Utilization.

TRUE ANSWER : ?
YOUR ANSWER : ?

Which lamp has a negative Colour Rendering Index (CRI)?

LED

Fluorescent

Low pressure sodium vapour

High pressure sodium vapour

TRUE ANSWER : ?
YOUR ANSWER : ?

The solid angle subtended by an area of 2400 cm2 on the surface of a sphere of diameter 1.2 m is

2 / 5.

2 / 3.

3 / 2.

1 / 3.

TRUE ANSWER : ?
YOUR ANSWER : ?

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