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Engineering :: Energy Conversion

191.  Which of the following gives nearly monochromatic light?
A. Sodium vapour lamp B. GLS lamp
C. Fluurescent tube D. Mercury vapour lamp
E. None of the above    
192.  The illumination level in the houses is usually in the range
A. 10 to 20 lumens/m2 B. 100 to 1400 lumens/m2
C. 400 to 650 lumens/m2 D. 1200 to 1600 lumens/m2
E. 2500 to 3000 lumens/m2    
193.  Which of the following is not the standard rating of GLS lamps in India?
A. 25 W B. 40 W
C. 50 W D. 60 W
E. 100 W    
194.  Visible spectrum of light has wavelength in the range
A. 10 to 40 A B. 100 to 400 A
C. 4000 to 7000 A D. 14,000 to 17,000 A
E. 40,000 to 70,000 A    
195.  Which of the following gas is sometimes filled in filament lamps?
A. Argon B. Ozone
C. Oxygen D. Helium
E. Hydrogen    
196.  The expected life of a GLS lamp is nearly
A. 50 hours B. 100 hours
C. 1000 hours D. 5000 hours
E. 10,000 hours    
197.  Which lamp is used for cinerma projectors
A. Frosted GLS lamp B. Nitrogen filled GLS lamp
C. Mercury vapour lamp D. Carbon arc lamp
E. Sodium vapour lamp    
198.  Power factor is expected to be highest in case of
A. Mercury vapour lamp B. Carbon arc lamp
C. Tube lights D. Sodium lamps
E. GLS lamp    
199.  The flicker effect of fluorescent lamps is more pronounced at
A. Lower frequencies B. Higher frequencies
C. Lower voltage D. Higher voltages
E. None of the above    
200.  The wavelength of green colour is nearly
A. 1000 A B. 2500 A
C. 4000 A D. 5500 A
E. 7500 A    

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