ONLINE MCQ EE-ILLUMINATION 6

ONLINE MCQ EE-ILLUMINATION 6

Q51. The purpose of coating the fluorescent tube from inside with white power is

A.  to improve its life
B.  to improve the appearance
C.  to change the colour of light emitted to white
D.  to increase the light radiations cl,ie to secondary emissions

Ans. D

Q52. In sodium vapour lamp the function of the leak transformer is

A.  to stabilize the arc
B.  to reduce the supply voltage
C.  both (a) and (b)
D.  None of above

Ans. C

ONLINE MCQ EE-ILLUMINATION 6

Q53. In case of ____ power factor is the power factor is the

A.  GLS lamps
B.  mercury arc lamps
C.  tube lights
D.  sodium vapour lamps

Ans. A

Q54. The vapour discharge tube used for domestic lighting has

A.  no filament
B.  one filament
C.  two filaments
D.  three filaments

Ans. C

Q55. 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

Ans. B

ONLINE MCQ EE-ILLUMINATION 6

Q56. Luminous efficiency of a fluorescent tube is

A.  10 lumens/watt
B.  20 lumens/watt
C.  lumens/watt
D.  60 lumens/watt

Ans. D

Q57. The filament of a GLS lamp is made of

A.  tungsten
B.  copper
C.  carbon
D.  aluminium

Ans. A

Q58. 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.  whether the object is to be seen for longer duration or shorter duration of time
E.  all above factors

Ans. E

ONLINE MCQ EE-ILLUMINATION 6

Q59. _____ will need lowest level of illumination

A.  Audiotoriums
B.  Railway platform
C.  Displays
D.  Fine engravings

Ans. B

Q60. Most affected parameter of a filament ‘lamp due to voltage change is

A.  wattage
B.  life
C.   luminous efficiency
D.  light output

Ans. C