Electrical Engineering · Question Bank

Illumination

101 of 143 questions match · page 1 of 6. Answer in your head first, then check the solution.

📘 EE Mock Board Exam
TypeAll 143Problem solving 42Objective 101
DifficultyAll 101Easy 101MediumHard
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#1📘 reviewer_appEasy
The study of illumination involves
Adesign of lighting system
Bstudy of lighting and wiring system
Ccalculation of wiring sizes for various lighting fixtures
Dstudy of photometry and its application
#2📘 reviewer_appEasy
The luminous flux emitted in unit solid angle by a uniform point source having a luminous intensity of 1 candela is called
ALumen
Blux
Cillumination
Dluminance
#3📘 reviewer_appEasy
The luminous intensity is defined as
Alumens per square meter
Bluminous flux per unit solid angle
Cillumination per square meter
Dcandela per unit solid angle
#4📘 reviewer_appEasy
The luminous intensity of a lamp is expressed in
Awatts
Blumens
Clux
Dcandela
#5📘 reviewer_appEasy
The illumination at a point a surface is the luminous flux per unit area of the surface and its unit is
Alux
Blumen
Ccandela
Dcandela power
#6📘 reviewer_appEasy
Low pressure in a fluorescent tube is obtain by
Ahigh starting voltage
Blow current density
Chigh current density
Dlow starting voltage
#7📘 reviewer_appEasy
The illumination of a surface is
Adirectly proportional to its distance from the source
Binversely proportional to its distance from the source
Cdirectly proportional to the square of its distance from the source
Dinversely proportional to the square of its distance from the source
#8📘 reviewer_appEasy
The first object of a lighting system is to provide adequate illumination on the working space. For proper design, the effects of the surroundings must be taken into account and the factors are
Afinish of windows, proportions of room and temperature
Bfinish of ceiling and walls, proportion of rooms and temperature
Ccolor of ceiling and walls, proportion of rooms and window space
Dheight of light fittings, room temperature and color of ceiling and walls
#9📘 reviewer_appEasy
To use lumen method of design, you must first find
Aroom index and the lumens
Broom index and then coefficient of utilization
Clight distribution from a polar curve and the coefficient of utilization
Dcoefficient of utilization and then room index
#10📘 reviewer_appEasy
Maintenance factor or depreciation factor takes account of
Aeffect of dust, dirt and fall in light output of the lamp during its life
Bdepreciation in capital cost of the installation
Ceffects of dust, dirt and the type of the lamp used
Dcondition of the room and the type of the lamp used
#11📘 reviewer_appEasy
Another requirement of good lighting scheme is that it makes the principal object the brightest thing in the field of vision. An illumination ratio of 10 : 3 :1 has been suggested as the best for
Abackground / task / surroundings
Btask / background / surroundings
Cbackground / surroundings / task
Dsurroundings / background / task
#12📘 reviewer_appEasy
The principle of working of a high pressure mercury vapour lamp is that
Athe radiation from the discharge excites a fluorescent material
Bthe radiation is produced directly by the discharge*
Cthe radiation is produced by the argon gas
Dvery high voltage is needed to start the discharge
#13📘 reviewer_appEasy
Although the average efficiency of a 400W high pressure mercury vapour lamp is high but its main disadvantages are
Ahigh cost colour distortion and high copper loss
Bcolour distortion, stroboscopic effect and can not be started immediately
Chigh cost can not be started immediately and high copper loss
Dneeds a capacitor, choking coil and a starter
#14📘 reviewer_appEasy
Energy radiated continuously in the form of lighting waves is called
Aluminous intensity
Bluminous flux
Clumen
D illumination
#15📘 reviewer_appEasy
The luminous flux emitted in unit solid angle by a uniform point source having a luminous intensity of 1 candela is called
ALumen
BLux
CIllumination
DLuminance
#16📘 reviewer_appEasy
The illumination of a surface is
Adirectly proportional to its distance from the source
Binversely proportional to its distance from the source
Cdirectly proportional to the square of its distance from the source
Dinversely proportional to the square of its distance from the source*
#17📘 reviewer_appEasy
The principle of working of a high pressure mercury vapour lamp is that
Athe radiation from the discharge excites a fluorescent material
Bthe radiation is produced directly by the discharge
Cthe radiation is produced by the argon gas
Dvery high voltage is needed to start the discharge
#18📘 reviewer_appEasy
Although the average efficiency of a 400W high pressure mercury vapour lamp is high, its main disadvantages are
Ahigh cost colour distortion and high copper loss
Bcolour distortion, stroboscopic effect and cannot be started immediately
Chigh cost can not be started immediately and high copper loss
Dneeds a capacitor, choking coil and a starter
#19📘 reviewer_appEasy
Founded the wave theory of light
AFrancesco Grimaldi
BEdward Appleton
CJames Clerk Maxwell
DChristian Huygens
#20📘 reviewer_appEasy
If a mirror is used to reflect light, the reflected light angle is _____ as the incident angle.
Asmaller
Blarger
Cthe same
Dindependent

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