Mcqs On Illumination | Objective Questions And Answers on Illumination | All Student World 1.7

Mcqs On Illumination | Objective Questions And Answer on Illumination | All student world 1.7




1).illumination of one lumen per sq. metre is called.
a)    lumen metre.
b)    lux.
c)    foot candle.
d)    candela.



2).A solid angle is expressed in terms of.
a)    radians/metre.
b)    radians.
c)    steradians.
d)    degrees.



3).carbon are lamps are commonly used in.
a)    photography.
b)    cinema projectors.
c)    domestic lighting.
d)    street lighting.



4).Filament lamp at starting will take current.
a)    less than its full running current.
b)    equal to its full running current.
c)    more than its full running current.
d)    100%



5).A reflector is provided to.
a)    protect the lamp.
b)    provide better illumination.
c)    avoid glare.
d)    do all of the above.



6). ....will need lowest level of illuminotion.
a)    Audiotoriums.
b)    Railway platform.
c)    Displays.
d)    Fine engravings.



7).in the fluorescent tube circuit the function of choke is primarily to.
a)    reduce the flicker.
b)    minimise the starting surge.
c)    initiate the arc and stabilize it.
d)    reduce the starting current.



8).Which of the following instruments is used for comparison of candle powers of different sources.
a)    Radiometer.
b)    Bunsen meter.
c)    photometer.
d)    candle meter.



9).Which of the following applications does not need ultraviolet lamps.
a)    car lighting.
b)    Medical purposes.
c)    Blue print machines.
d)    Aircraft cockpit dashboard lighting.



10).on which of the following factors does the depreciation or maintenance factor depend.
a)    lamp cleaning schedule.
b)    Ageing of the lamp.
c)    Type of work carried out at the premises.
d)    All of the above factors.






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Mcqs On illumination or multiple choice questions ans answers | Objective Question on Illumination | All student World 1.6



Mcqs on Illumination or Objective question and answers on Illumination | All student world 


1).The illumination is directly proportional to the cosine of the angle made by the normal to the illuminated surface with direction of the incident flux.above statement is associated with
a)    Lamberts cosine law.
b)    planck's law.
c)    Bunsen's law of the illumination.
d)    Macbeth's law of illumination.



2).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 observer.
d)    all above factors.



3).which of the following bulbs operates on least power.
a)    GLS bulb.
b)    Torch bulb.
c)    Neon bulb.
d)    Night bulb.



4).A poor man for his kitchen will make use of.
a)    fluorescent tube.
b)    incandescent lamp.
c)    sodium vapour lamp.
d)    high pressure mercury vapour lamp.



5).Soft shadows are produced by.
a)    using surface source of light instead of point source of light.
b)    increasing the number of lamps.
c)    both(a)and(b).
d)    none of the above.



6).In sodium vapour lamp neon gas.
a)    acts as a shield around the filament.
b)    assists in developing enough heat to vaporize the sodium.
c)    change the colour of light.
d)    prevents the vaporization of filament.



7).Glare is reduced by.
a)    using diffusers.
b)    increasing the height of the lamp.
c)    using reflectors to cut-off the light at certain angle.
d)    all of the above.



8).when an electric bulb is broken it produces bang;this is due to.
a)    vacuum inside the bulb.
b)    pressure of air in the bulb.
c)    pressure inside is equal to that outside.
d)    none of the above.





9).The tungsten filament lamps when compared with fluorescent tubes have all the following advantages except.
a)    simple installation.
b)    longer life.
c)    less costly.
d)    More brightness.



10).The level of illumination on a surface least depends on.
a)    ambient temperature.
b)    candle power of the source.
c)    distance of the source.
d)    type of reflector used.







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Mcqs On Illumination or Objective Questions And Answer on Illumination | All student World 1.5






1).which of the following lamps is the cheapest for the same wattage.
a)    Fluorescent tube.
b)    Mercury vapour lamp.
c)    GLS lamp.
d)    sodium vapour lamp.



2).For the same lumen output,the running cost of the fluorescent lamp is.
a)    equal to that of filament lamp.
b)    less than that of filament lamp.
c)    more than that of filament lamp.
d)    any of the above.



3).For the same power output.
a)    high voltage rated lamps will be more sturdy.
b)    low voltage rated lamps will be more sturdy.
c)    both low and high voltage rated lamps will be equally sturdy.
d)    agenda



4).The cost of a fluorescent lamp is more than that of incandescent lamp because of which of the following factors.
a)    More labour is required in its manufacturing.
b)    Number of components used is more.
c)    quantity of glass used is more.
d)    All of the above lactors.



5).The function of capacitor across the supply to the fluorescent tube is primarily to.
a)    stabilize the arc.
b)    reduce the starting current.
c)    improve the supply power factor.
d)    reduce the noise.



6).A substance which change its electrical resistance when illuminated by light is called.
a)    photoelectric.
b)    photovoltaic.
c)    phatoconductive.
d)    none of the above.



7).In electric discharge lamps light is produced by.
a)    cathode ray emission.
b)    ionisation in a gas or vapour.
c)    heating effect of current.
d)    magnetic effect of current.



8).In electric discharge lamps for stabilizing the arc.
a)    a reactive choke is connected in series with the supply.
b)    a condenser is connected in series to the supply.
c)    a condenser is connected in parallel to the supply.
d)    a variable resistor is connected in the circuit.



9).In an incandescent lamp bird cage filament is usually used in vacuum bulb so as to.
a)    reduce the oxidation phenomenon.
b)    reduce the convection losses.
c)    have uniform radiations.
d)    increase the life span of the filament.



10).stroboscopic effect due to use of discharge lamps in workshops results in moving machinery appearing.
a)    stationary.
b)    stationary running slow.
c)    stationary running in reverse direction.
d)    all of the above.