Electric Illumination MCQ PDF

101. The lumens emitted from a 100 W incandescent lamp will not increase if

(a) supply voltage is increased.
(b) filament temperature is increased.
(c) the diameter of the glass shell is increased.
(d) any of the above.

102. Total flux required in any lighting scheme depends inversely on

(a) surface area.
(b) space-height ratio.
(c) illumination.
(d) coefficient of utilization.

103. To avoid glare

(a) object should be viewed from a distance.
(b) object should be moved constantly.
(c) object should be viewed from a close vicinity.
(d) viewer should move constantly.

104. The illumination level on a surface is least affected by

(a) candle power of light source.
(b) ambient temperature.
(c) type of reflector used.
(d) distance of the light source.

105. Desired illumination level on the working plane depends upon

(a) age group of observers.
(b) whether the object is stationary or moving.
(c) size of the object to be seen and its distance from the ob-server.
(d) all of the above.

106. Which of the following will need the highest level of illumination ?

(a) Living room.
(b) Kitchen.
(c) Proof reading.
(d) Hospital wards.

107. Which of the following will need the lowest level of illumination ?

(a) Workshop.
(b) Displays.
(c) Railway platform.
(d) Garage.

108. The illumination level in houses is in the range of

(a) 20 – 50 lux.
(b) 100 – 200 lux.
(c) 300 – 500 lux.
(d) 700 lux.

109. The illumination level required for precision work is about

(a) 500 – 1,000 lux.
(b) 250 lux.
(c) 100 lux.
(d) 50 lux.

110. The illumination level required for important traffic routes carrying fast traffic is about

(a) 30 lux.
(b) 100 lux.
(c) 200 lux.
(d) 5 lux.

111. Illumination due to moon light is about

(a) 0.03 lumen/m².
(b) 0.3 lumen/m².
(c) 30 – 50 lumens/m².
(d) 300 – 500 lumens/m².

112. The luminous flux reaching the working plane least depends on

(a) proportion of the room.
(b) the lumen output of the lamps.
(c) color of the working plane surface.
(d) reflectance of internal surfaces.

113. The depreciation factor depends upon

(a) ageing of the lamp(s).
(b) lamp cleaning schedule.
(c) type of work carried out at the premises.
(d) all of the above.

114. Utilization factor depends upon

(a) size of the room.
(b) space-height ratio of the lamps.
(c) color of walls/ceiling.
(d) all of the above.

115. Glare is reduced by

(a) increasing the mounting height of the lamp.
(b) using diffusers.
(c) using reflectors to cut-off the light at certain angle.
(d) all of the above.

116. The glass that transmits the maximum light is

(a) clear glass.
(b) milk glass.
(c) serrated glass.
(d) opalescent glass.

117. The glass that transmits the least amount of light is

(a) clear glass.
(b) milk glass.
(c) serrated glass.
(d) opalescent glass.

118. The surface that has the lowest reflection factor for white light is

(a) white oil paint.
(b) white plaster work.
(c) blue curtains.
(d) aluminum sheet.

119. The lamp is provided with a reflector in order to

(a) avoid glare.
(b) provide better illumination.
(c) protect the lamp.
(d) all of the above.

120. Reflectors are provided with slits at the top so as to

(a) reduce heating effect.
(b) reduce color effect.
(c) introduce chimney effect for cleaning.
(d) all of the above.

121. Heat from light source is particularly of importance in

(a) designing for air-conditioning.
(b) designing for illumination level.
(c) designing for floor space utilization.
(d) all of the above.

122. Dimming systems for lights are used in

(a) auditoriums.
(b) theatres.
(c) ball rooms.
(d) all of the above.

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