100 Important Illumination MCQ Question and Answer | PDF Free Download
1.For the same lumen output, the running cost of the fluorescent lamp is
- AEqual to that of filament lamp
- BLess than that of filament lamp
- CMore than that of filament lamp
- DAny of the above
2.For the same power output
- AHigh voltage rated lamps will be more sturdy
- BLow voltage rated lamps will be more sturdy
- CBoth low and high voltage rated lamps will be equally sturdy
- DNone of the above
3.The cast of a fluorescent lamp is more than that of incandescent lamp because of which of the following factors?
- AMore labour is required in its manufacturing
- BNumber of components used is more
- CQuantity of glass used is more
- DAll of the above factors
4.Filament lamp at starting will take current
- ALess than its full running current
- BEqual to its full running current
- CMore than its full running current
- DNone of these
5.A reflector is provided to
- AProtect the lamp
- BProvide better illumination
- CAvoid glare
- DAll of the above
6.The purpose of coating the fluorescent tube from inside with white power is
- ATo improve its life
- BTo improve the appearance
- CTo change the colour of light emitted to white
- DTo increase the light radiations due to secondary emissions
7._____________ will need lowest level of illumination.
- AAuditorium
- BRailway platform
- CDisplays
- DFine engravings
8.Due to moonlight, illumination is nearly
- A3000 lumen/sq. metre
- B300 lumen/sq. metre
- C30 lumen/sq. metre
- D0.3 lumen/sq. metre
9.Which of the following instrument is used for the comparison of candle powers of different sources?
- ARadiometer
- BBunsen meter
- CPhotometer
- DCandle meter
10. _____________ Photometer is used for comparing the lights of different colours?
- AGrease spot
- BBunsen
- CLummer-brodhum
- DGuilds flicker
11. The primary function of choke In the fluorescent tube circuit is to
- AReduce the flicker
- BMinimise the starting surge
- CInitiate the arc and stabilize it
- DReduce the starting current
12.The lamp that cannot sustain much voltage fluctuations is
- ASodium vapour lamp
- BMercury vapour lamp
- CIncandescent lamp
- DFluorescent lamp
13.The primary function of capacitor across the supply to the fluorescent tube is to
- AStabilize the arc
- BReduce the starting current
- CImprove the supply power factor
- DReduce the noise
14.Which lamp does not have separate choke?
- ASodium vapour lamp
- BFluorescent lamp
- CMercury vapour lamp
- DAll of the above
15.In sodium vapour lamp the function of the leak transformer is
- ATo stabilize the arc
- BTo reduce the supply voltage
- CBoth (a) and (b)
- DNone of the above
16.Most affected parameter of a filament lamp due to voltage change is
- AWattage
- BLife
- CLuminous efficiency
- DLight output
17.In electric discharge lamps for stabilizing the arc
- AA reactive choke is connected in series with the supply
- BA condenser is connected in series to the supply
- CA condenser is connected in parallel to the supply
- DA variable resistor is connected in the circuit
18.For precision work the illumination level required is of the order of
- A500 ? 1000 lumens/sq. metre
- B200 ? 400 lumens/sq. metre
- C50 ? 100 lumens/sq. metre
- D10 ? 25 lumens/sq. metre
19.____________ is a cold cathode lamp.
- AFluorescent lamp
- BNeon lamp
- CMercury vapour lamp
- DSodium vapour lamp
20.In case of _____________ least illumination level is required.
- ASkilled bench work
- BDrawing offices
- CHospital wards
- DFine machine work