Electrical Engineering · Question Bank

Illumination

143 questions · page 6 of 8. Answer in your head first, then check the solution.

📘 EE Mock Board Exam
TypeAll 143Problem solving 42Objective 101
DifficultyAll 143Easy 122Medium 18Hard 3
#101📘 EE Pocket Reviewer RojasEasy
The color of light is dependent on which of the following?
AFrequency
BWavelength
CSpeed of light
DBoth A and B
#102📘 EE Pocket Reviewer RojasEasy
The flicker effect of a fluorescent lamp is more at which of the following conditions?
AAt lower voltage
BAt higher voltage
CAt lower frequencies
DAt higher frequencies
#103📘 EE Pocket Reviewer RojasEasy
Which of the following gases can be filled in a GLS lamp?
AOxygen
BCarbon dioxide
CXenon
DAny inert gas
#104📘 EE Pocket Reviewer RojasEasy
The level of illumination on a surface least depends on which of the following?
AAmbient temperature
BCandle power of the source
CDistance of the source
DType of reflector used
#105📘 EE Pocket Reviewer RojasEasy
The total flux required in any lighting system depends inversely in which of the following?
AIllumination
BSurface area
CSpace/height ratio
DCoefficient of utilization
#106📘 EE Pocket Reviewer RojasEasy
On the average, the life of an incandescent lamp is about how many burning hours?
A100 hours
B200 hours
C1000 hours
D10,000 hours
#107📘 EE Pocket Reviewer RojasEasy
Lumen per watt is the unit of which one?
ALuminous efficiency
BCandle power
CIllumination
DLuminous intensity
#108📘 EE Pocket Reviewer RojasEasy
In sodium lamp, what is the function of the leak transformer?
ATo stabilize the arc
BTo reduce the supply voltage
CBoth A and B
DNone of these
#109📘 EE Pocket Reviewer RojasEasy
What is a perfect diffuser surface?
AIt diffuses all the incident light
BIt absorbs all the incident light
CIt transmits all the incident light
DIt scatters light uniformly in all directions
#110📘 EE Pocket Reviewer RojasEasy
On which of the following factors does the depreciation factor depend?
ACleaning of lamp
BAgeing of lamp
CType of work carried on in the premises
DAll of these
#111📘 EE Pocket Reviewer RojasEasy
What is the illumination required for normal reading purposes?
A20 to 40 lumens/m²
B60 to 100 lumens/m²
C200 to 300 lumens/m²
DNone of these
#112📘 EE Pocket Reviewer RojasEasy
What is the color of the light of a sodium vapor discharge lamp?
APink
BYellow
CBluish white
DBright red
#113📘 EE Pocket Reviewer RojasEasy
Which of the following statements is true about the coating in a fluorescent lamp?
AIt will reduce glare
BIt will convert ultra-violet radiations into visible light
CIt will convert visible light into ultra-violet radiations
DIt will protect the tube and prolong the life of the lamp
#114📘 EE Pocket Reviewer RojasEasy
Which of the following type of lamps uses a starting switch?
APreheat
BRapid start
CInstant start
DAll of these
#115📘 EE Pocket Reviewer RojasEasy
How does the illumination of a surface related to its distance from the light source?
ADirectly proportional to the distance
BDirectly proportional to the square of the distance
CInversely proportional to the distance
DInversely proportional to the square of the distance
#116📘 EE Pocket Reviewer RojasEasy
Which of the following lamps gives out light that is nearest to ultraviolet?
AVacuum type filament lamp
BNitrogen filled filament lamp
CArgon filled filament lamp
DCarbon arc lamp
#117📘 EE Pocket Reviewer RojasEasy
Which one is another term for maintenance factor?
AUse factor
BIndex factor
CDepreciation factor
DUtilization factor
#118📘 EE Pocket Reviewer RojasEasy
Which of the following lamps is more preferred in air conditioned spaces?
AIncandescent lamp
BMercury vapor lamp
CFluorescent lamp
DSodium vapor lamp
#119📘 EE Pocket Reviewer RojasEasy
For the same wattage, which lamp is the cheapest?
ASodium vapor Lamp
BMercury Vapor lamp
CGLS lamp
DFluorescent lamp
#120📘 EE Pocket Reviewer RojasEasy
What do you call the energy radiated continuously in the form of light waves?
ALuminous intensity
BLumen
CIlluminance
DLuminous flux

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