A 100 watt, 230 volt gas filled lamp has a mean spherical candle power of 92. Find its efficiency in lumens per watt.
A9.56
B10.56
C11.56
D12.56
Electrical Engineering · Question Bank
Illumination
143 questions · page 5 of 8. Answer in your head first, then check the solution.
Energy radiated continuously in the form of light waves is called
Aluminous intensity
Blumen
Cluminousflux
Dillumination
A light source located 2.75 m from a surface produces an illumination of 528 lux on the surface. Find the illumination if the distance is changed to 1.55 m.
A298 lux
B1,662 lux
C937 lux
D168 lux
What is the power factor of an incandescent lamp?
AZero pf
BUnity pf
CLagging pf
DLeading pf
Which of the following work place requires the least illumination in comparison to the others?
ASkilled bench work
BDrawing office
CFine machine work
DHospital ward
The unit called “candela” is the unit of which of the following?
ALuminous intensity
BLuminous flux
CLumen per square meter
DLumen per watt
Carbon arc lamps are commonly used in which of the following applications?
APhotography
BStreet lighting
CDomestic lighting
DCinema projectors
Which of the following glass transmits the most light?
AMilky glass
BClear glass
COpalescent glass
DSerrated glass
For the same rating, which of the following lamps produced the least amount of radiant heat?
AFilament lamp
BFluorescent lamp
CSodium vapor lamp
DMercury vapor lamp
Which statement below describes the polar curve of a filament lamp?
AIt shows the luminous intensity in all directions in one plane around a light source
BIt shows the effectiveness of the reflector used for a lamp
CIt shows the efficiency of the lamp
DIt shows the distribution of illumination in all directions
How do you call a body that reflects the entire incident radiations on it?
ABlack body
BTransparent body
CGray body
DWhite body
Which of the following statements about light is correct?
AIt is a form of heat energy
BIt is a form of electrical energy
CIt consists of shooting particles
DIt consists of electromagnetic waves
Which of the following applications does not need ultraviolet lamps?
ACar lighting
BMedical purposes
CBlue print machine
DAircraft cockpit dashboard lighting
Which of the following is the definition of luminous intensity?
ALuminous flux per unit solid angle
BLumens per square meter
CCandela per unit solid angle
DLumens per square foot
The filament of a GLS lamp is made from which materials?
ACarbon
BSilicon
CTungsten
DAluminum
Which of the following lamps cannot sustain much voltage fluctuations?
ASodium vapor lamp
BIncandescent lamp
CFluorescent lamp
DMercury vapor lamp
What is the unit of illumination equal to one lumen per square meter?
ALux
BCandela
CLumen
DFootcandle
What is the purpose of coating the fluorescent tube from the inside with white powder?
ATo improve its life
BTo improve its appearance
CTo change the color of light emitted to white
DTo increase the light radiation due to secondary emissions
Another requirement for a good lighting system 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 ratio for which of the following?
ATask: surroundings: backgrounds
BTask: backgrounds: surroundings
CBackground: task: surroundings
DSurroundings: backgrounds: task
Depreciation factor is related to which of the following factors?
AEffects of dust, dirt and fall in light output of the lamp during its life
BDepreciation in cost of the lamp
CType of lamp used as to its maximum burning hours
DCondition of the room and the type of lamp used
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