Question is ⇒ Most affected parameter of a filament 'lamp due to voltage change is, Options are ⇒ (A) wattage, (B) life, (C) luminous efficiency, (D) light output, (E) , Leave your comments or Download question paper.

Question is ⇒ Most affected parameter of a filament 'lamp due to voltage change is, Options are ⇒ (A) wattage, (B) life, (C) luminous efficiency, (D) light output, (E) , Leave your comments or Download question paper. Previous question Next question


Q1.	Most affected parameter of a filament 'lamp due to voltage change is
A.	wattage [Wrong Answer]
B.	life [Correct Answer]
C.	�� luminous efficiency [Wrong Answer]
D.	light output [Wrong Answer]
View Answer 11 -3 Explanation:- Answer : B Discuss it below : !! OOPS Login [Click here] is required to post your answer/result Help other students, write article, leave your comments

Previous question Next question

Also Read Similar Questions Below :

⇒ Which of the following lamps is the 'cheapest for the same wattage ?
Fluorescent tube
Mercury vapour lamp
GLS lanip
Sodium vapour lamp

⇒ Which of the following instruments is used for the comparison of candle powers of different sources ?
Radiometer
Bunsen meter.
Photometer
Candle meter

⇒ In the fluorescent tube circuit the function of choke is primarily to
reduce the flicker
minimise the starting surge
initiate the arc and stabilize it
reduce the starting current

⇒ ____ cannot sustain much voltage fluctuations.
Sodium vapour lamp
Mercury vapour lamp
   Incandescent lamp
Fluorescent lamp

⇒ In an incandescent lamp bird cage filament is usually used in vacuum bulb so as to
reduce the oxidation phenomenon
reduce the convection losses
have uniform radiations
increase the life span of the filament

⇒ Filament lamp at starting will take current
less than its full running current
equal to its full running current
more than its full running current

⇒ Which gas can be filled in GLS lamps ?
Oxygen
Carbon dioxide
Xenon
Any inert gas

⇒ Glare is reduced by
using diffusers
increasing the height of the lamp
using reflectors to cut-off the light at certain angle
all of the above

⇒ Luminous flux is
the light energy radiated by sun
the part of light energy, radiated by sun, which is received on the earth
the rate of energy radiation in the form of light waves
none of the above

⇒ Illumination of one lumen per square metre is called
lumen metre
lux
foot candle
candela

⇒ Which of the following statements is correct ?
Light is a form of heat energy
Light is a form of electrical energy
Light consists of shooting particles
Light consists of electromagnetic waves

⇒ In incandescent lamps, coiled coil filaments are used for
coloured lamps
higher wattage lamps
gas filled lamps
low wattage lamps '(e) none of the above

⇒ In fluorescent tubes ballast resistance is connected in series with the choke
to reduce stroboscopic effects
when tube operates on D.C. supply
when supply frequency is low
to reduce radio interference

⇒ In ligting circuit using filament lamps 1% voltage drop results into
no loss of light
1.5 percent loss in the light output
3.5 percent loss in the light output
15 percent loss in the light output

⇒ In houses the illumination is in the range of
2-5 lumens/watt
10-20 lumens/watt
35-45 lumens/watt
60-65 lumens/watt

⇒ Co-efficient of utilisation depends upon
colour of the walls
colour of ceiling
size of the room
all of the above

⇒ ____ does not have separate choke
Sodium vapour lamp
Fluorescent lamp
   Mercury vapour lamp
All of the above

⇒ Stroboscopic effect due to use of discharge lamps in workshops results in moving machinery appearing
stationary
stationary running slow
stationary running in reverse direction
all of the above

⇒ A poor man for his kitchen will make use of
fluorescent tube
incandescent lamp
sodium vapour lamp
high pressure mercury vapour lamp

⇒ Luminous efficiency of a fluorescent tube is
10 lumens/watt
20 lumens/watt
lumens/watt
60 lumens/watt

⇒ The tungsten filament lamps when compared with fluorescent tubes have all the following advantages except
simple installation
longer life
less costly
more brightness

⇒ In electric discharge lamps light is produced by
cathode ray emission
ionisation in a gas or vapour
   heating effect of current
magnetic effect of current

⇒ The colour of sodium vapour discharge lamp is
red
pink
yellow
bluish green

⇒ A solid angle is expressed in terms of _____
radians/metre
radians
steradians
degrees

⇒ In case of ____ least illumination level is required.
skilled bench work
drawing offices
   hospital wards
fine machine work

⇒ What percentage of the input energy is radiated by filament lamps ?
2 to 5 percent
10 to 15 percent
25 to 30 percent
40 to 50 percent

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

⇒ For precision work the illumination 'level required is of the order of
500-1000 lumens/m²
200-400 lumens/m²
   50-100 lumens/m²
10-25 lumens/m²

⇒ Desired illumination level on the working plane depends upon
age group of observers
whether the object is stationary or moving
size of the object to be seen and its distance from the observer
whether the object is to be seen for longer duration or shorter duration of time

⇒ Photometer is used for comparing 'the lights of different colours ?
Grease spot
Bunsen
   Lummer brodhum
Guilds flicker