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? 1:2 2√2 : 1 1: 2√2 2:1 1:2 2√2 : 1 1: 2√2 2:1 ANSWER DOWNLOAD EXAMIANS APP
Illumination Luminous efficiency of a fluorescence lamp is 30 lumens / watt. 40 lumens / watt. 60 lumens / watt. 70 lumens / watt. 30 lumens / watt. 40 lumens / watt. 60 lumens / watt. 70 lumens / watt. ANSWER DOWNLOAD EXAMIANS APP
Illumination Candela is the unit of which? Wavelength. Luminous flux. Luminous intensity. Frequency. Wavelength. Luminous flux. Luminous intensity. Frequency. ANSWER DOWNLOAD EXAMIANS APP
Illumination What will be the total flux emitted by a source of 60 candle power? 60 lumens. None of these. 0.001326 lumens. 754.2 lumens. 60 lumens. None of these. 0.001326 lumens. 754.2 lumens. ANSWER DOWNLOAD EXAMIANS APP
Illumination A 1000 W bulb fitted with a reflector illuminates an area of 3 m x 3 m with an average illumination of 450 lux. If the bulb has and efficiency of 9 lumens / watt the efficiency of the reflector is 70 %. 45 %. 30 %. 20 %. 70 %. 45 %. 30 %. 20 %. ANSWER DOWNLOAD EXAMIANS APP
Illumination Unit of luminous flux is lumens. steradians. candela. lux. lumens. steradians. candela. lux. ANSWER DOWNLOAD EXAMIANS APP
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