Electrical Engineering · Question Bank

Illumination

122 of 143 questions match · page 3 of 7. Answer in your head first, then check the solution.

📘 EE Mock Board Exam
TypeAll 122Problem solving 21Objective 101
DifficultyAll 143Easy 122Medium 18Hard 3
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#41📜 EE Pre-Board August 2012📘 PowerhouseEasy
A standard candle emits a total luminous flux of _ lumens.
A157.9
B78.96
C25.14
D12.57
#42📜 EE Pre-Board March 2013📘 PowerhouseEasy
What do you call the interior lighting where the roof trusses or ceiling height is greater than 7.6 m above floor level.
AHID
BHigh Bay
CHigh mast
DHigh pressure sodium
#43📜 EE Pre-Board March 2013📘 PowerhouseEasy
The luminous intensity of a lamp is expressed in
Alux
Blumens
Ccandela
Dfoot-candle
#44📜 EE Pre-Board August 2013📘 PowerhouseEasy
The power factor of incandescent bulb is
A0.8 lagging
B0.8 leading
Cunity
Dzero
#45📜 EE Pre-Board March 2014📘 PowerhouseEasy
An unshaded lamp is 6 m above the table. It is lowered down by 2 m. By how much is the illumination on the table increased?
A2 times
B2.25 times
C2.5 times
D2.75 times
#46📜 EE Pre-Board March 2014📘 PowerhouseEasy
The meter movement in an illumination meter directly measures
Acurrent
Bvoltage
Cpower
Denergy
#47📜 EE Pre-Board August 2014📘 PowerhouseEasy
A direct lighting fixture directs at least
A90 of the light downward
B85 of the light downward
C85 of the light upward
D80 of the light downward
#48📜 EE Pre-Board August 2014📘 PowerhouseEasy
Calculate the distance from a normally placed screen a 30 candela lamp be placed in order that the illumination be 5 lux.
A2.45 m
B4.45 m
C5.25 m
D3.77 m
#49📜 EE Pre-Board March 2015📘 PowerhouseEasy
A medium unshaded lamp hangs 8 m directly above the table. To what distance should it be lowered to increase the illumination to 2 times its former value?
A2.34 m
B5.66 m
C4 m
D4.64 m
#50📜 EE Pre-Board March 2015📘 PowerhouseEasy
Calculate the mean spherical candle power of a lamp emitting a flux of 1,500 lumens.
A119.37 cd
B1,500 cd
C375 cd
D477.46 cd
#51📜 EE Pre-Board March 2015📘 PowerhouseEasy
The ratio of lumens reaching the work plane divided by the total lumens generated by the light is:
ARoom ratio
BCoefficient of utilization
CIllumination factor
DMaintenance factor
#52📜 EE Pre-Board August 2015📘 PowerhouseEasy
A lamp produces an initial illumination of 800 lux over a normally placed screen. If the distance of the lamp from the screen is doubled, what is the new illumination on the screen?
A100 lux
B200 lux
C300 lux
D400 lux
#53📜 EE Pre-Board August 2015📘 PowerhouseEasy
A lamp produces an illumination of 10 lux at point 10 m directly below it. What is luminous intensity of the lamp?
A100 cd
B1,000 cd
C10 cd
D1 cd
#54📜 EE Pre-Board March 2016📘 PowerhouseEasy
A room 8 m × 12 m is lighted by 15 lamps to a fairly uniform illumination of 100 lumens per square meter. What is the coefficient of utilization if the output of each lamp is 1,600 lumens?
A40 %
B60 %
C30 %
D50 %
#55📜 EE Pre-Board March 2017📘 PowerhouseEasy
The study of illumination involves
Adesign of lighting system
Bstudy of lighting and wiring system
Ccalculation of wiring sizes for various lighting fixtures
Dstudy of photometry and its application
#56📜 EE Pre-Board August 2017📘 PowerhouseEasy
A lamp has a luminous efficiency of 11 lm/watt and gives out a luminous flux of 275 lm. What is the wattage of the lamp?
A20 W
B25 W
C30 W
D40 W
#57📜 EE Pre-Board August 2017📘 PowerhouseEasy
A uniform source of light gives 1,884 lumens and is suspended 4 m above the center of a floor 3 m square. Find the illumination in lm/m² at the floor level directly below the lamp.
A9.4
B37.5
C117.8
D150
#58📜 EE Pre-Board March 2018📘 PowerhouseEasy
A 100 watt, 230 volt gas filled lamp has a mean spherical candlepower of 92. Find its efficiency in lumens per watt.
A11.56
B1.156
C115.6
D1,156
#59📜 EE Pre-Board March 2018📘 PowerhouseEasy
The luminous intensity is defined as
Alumen per square meter
Bluminous flux per unit solid angle
Cillumination per square meter
Dcandela per unit solid angle
#60📜 EE Pre-Board August 2018📘 PowerhouseEasy
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

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