Prepare for your examinations with a set of multiple choice questions (MCQs) related to Illumination  for Electrician Trade. The questions are likely designed to test a user’s knowledge or understanding of electrical concepts and may be useful for exam preparation or self-assessment. The website may be a helpful resource for individuals studying to become electricians or seeking to improve their understanding of electrical principles.

ILLUMINATION

What is the S.I. unit of luminous intensity? Lux Lumen Candela Steradian

What is the working temperature of filament lamp? 1500°C 1800°C 2000°C 2300°C

Which material is coated in tungsten electrode of a fluorescent tube lamp? Silver oxide Phosphor powder Fluorescent powder Barium and strontium oxide

Which position MB type high pressure mercury vapor lamps are operated? Vertical Inclined Horizontal Any position

What is the function of leak transformer in high pressure sodium vapor lamp circuit? Reduce the starting current Reduce the working voltage Increase the working voltage Ignite the high voltage initially

How stroboscopic effect in industrial twin tube light fitting is reduced? Connecting capacitor parallel to supply Connecting capacitor in series with supply Connecting capacitor in series with one tube light Connecting two capacitors in series to each tube light

What is the current carrying capacity of flasher, if the current is 100 mA in each row? 50 mA 100 mA 200 mA 300 mA

Which term refers that the flow of light into a plane surface? Lumen Illuminance Luminous flux Luminous intensity

What is the purpose of ignitor in high pressure sodium vapor lamp circuit? Decreases the starting current Increases the running voltage Decreases the running current Generates high voltage pulse at starting

Which type of light fitting design has free from glare? Semi direct type Semi indirect type Direct lighting type Indirect lighting type

Why the outer tube of a high pressure metal halide lamp made of borosilicate glass? Increase the lighting effect Withstand heavy temperature Withstand atmospheric pressure Reduce the ultra violet radiation from lamp

What is the term refers luminous flux given by light source per unit solid angle? Lumen Candela Luminance Luminous intensity

What is the unit of luminous flux? Lux Lumen Candela Lumen/m

What is the unit of luminous efficiency? Lux Lumen Lumen/m Lumen/watt

How the rate of evaporation in a vacuum bulb is reduced? Filling inert gas Producing arc in bulb Reducing filament resistance Increasing filament resistance

What is the main advantage of coiled coil lamp? High melting point Higher light output Low operating voltage Low power consumption

What is the name of the reflector?

Mirror type Soft light type Parabolic type Dispersive type

Which device provides ignition voltage and act as choke in a HPSV lamp? Arc tube Sodium vapour Leak transformer High pressure aluminium oxide

What is the name of lamp?

MAT type MV lamp HP metal halide lamp MB type HPMV lamp MA type HPMV lamp

Which type of lighting system is used for flood and industrial lighting? Direct lighting Indirect lighting Semi-direct lighting Semi-indirect lighting

Which type of lighting system is used for flood and industrial lighting? Direct lighting Indirect lighting Semi-direct lighting Semi-indirect lighting

Which is the cold cathode lamp? Halogen lamp Neon sign lamp Fluorescent lamp Mercury vapor lamp

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