Illumination The solid angle subtended by an area of 2400 cm2 on the surface of a sphere of diameter 1.2 m is 3 / 2. 1 / 3. 2 / 5. 2 / 3. 3 / 2. 1 / 3. 2 / 5. 2 / 3. ANSWER DOWNLOAD EXAMIANS APP
Illumination 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√2 : 1 2:1 1: 2√2 1:2 2√2 : 1 2:1 1: 2√2 1:2 ANSWER DOWNLOAD EXAMIANS APP
Illumination Candela/metre square is the unit of which photometric quantity? Luminance Luminous Intensity Luminous flux Illuminance Luminance Luminous Intensity Luminous flux Illuminance ANSWER DOWNLOAD EXAMIANS APP
Illumination 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 4 6 2 5 4 6 ANSWER DOWNLOAD EXAMIANS APP
Illumination The work of ballast in a fluorescent tube is to both ‘a’ and ‘b’. provide a kick start when voltage is induced. None of these. limit the flow of current. both ‘a’ and ‘b’. provide a kick start when voltage is induced. None of these. limit the flow of current. ANSWER DOWNLOAD EXAMIANS APP
Illumination The illumination at a point 5 meters below a lamp in 6 lux. The candle power of the lamp is 150. 140. 200. 30 150. 140. 200. 30 ANSWER DOWNLOAD EXAMIANS APP
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