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Multiple Choice Question (MCQ) of Illumination page-12

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111. Which of the following can be used as a light-dimming device ?

A) Auto transformer
B) Variable resistor
D) Any of the above.

Ans : (D)

112. Dimming systems for lights are used in

A) theatres
B) auditoriums
C) bed room
D) all of the above.

Ans : (D)

113. A fluorescent tube can be operated on

A) ac only
B) dc only
C) Both ac as well as dc
D) none.

Ans : (C)

114. Radio interference generally results due to

A) Sodium lamps
B) Fluorescent lamps
C) Halogen lamps
D) GLS lamps.

Ans : (B)

115. Blinking of a fluorescent tube may be due to

A) low circuit voltage
B) low ballast rating
C) low temperature
D) any of the above.

Ans : (D)

116. Radio interference from a fluorescent lamp can be reduced by

A) putting two lamps in parallel
B) eliminating choke
C) putting a capacitor across the lamp
D) none of the above.

Ans : (C)

117. Wavelength for blue colour

A) 4400 A
B) 5250 A
C) 6150 A
D) 5950 A.

Ans : (A)

118. In case of a fluorescent lamp if only the ends of the lamp remain lighted it indicates

A) defective wiring
B) a defective tube
C) a defective choke
D) a short circuited starter.

Ans : (D)

119. The disadvantage of fluorescent lamps as compared to GLS lamps is

A) noise in choke
B) stroboscopic effect
C) high cost
D) all of the above.

Ans : (D)

120. The colour of light depends on

A) wavelength
B) frequency
C) wavelength and frequency
D) wavelength, frequency speed and intensity.

Ans : (C)

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