ONLINE MCQ EE-ILLUMINATION 7
Category –EE Online Test
Telegram-Join Us On Telegram
Attempt Free ONLINE MCQ EE-ILLUMINATION 7 Here. Read The Important Electrical MCQ From Below.
Q61. A mercury vapour lamp gives ____ light.
A. white
B. pink
C. yellow
D. greenish blue
Ans. D
Q62. 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
Ans. C
Q63. 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
Ans. C
ONLINE MCQ EE-ILLUMINATION 7
Q64. Fine diameter tungsten wires are made by
A. turning
B. swaging
C. compressing
D. wire drawing
Ans. D
Q65. 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 above
Ans. D
Q66. Due to moonlight, illumination is nearly
A. 3000 lumens/m2
B. 300 lumens/m2
C. 30 lumens/m2
D. 0.3 lumen/m2
Ans. D
ONLINE MCQ EE-ILLUMINATION 7
Q67. 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
Ans. A
Q68. Sometimes the wheels of rotating machinery, under the influence of fluorescent lamps appear to be stationary. This is due to the
A. low power factor
B. stroboscopic effect
C. fluctuations
D. luminescence effect
Ans. A
Q69. 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
Ans. D
ONLINE MCQ EE-ILLUMINATION 7
Q70. Reflectors are provided with slits at the top to
A. introduce chimney effect for cleaning
B. reduce colour contrast
C. reduce heating effect
D. do all of the above functions
Ans. D
