Illumination
Electrician Trade Theory, Module-10
Illumination
⭕️ Show all Answers
Q1: What is the S.I unit of luminous intensity?
- Lux
- Lumen
- Candela
- Steradian
Q2: What is the working temperature of filament lamp?
- 1500°C
- 1800°C
- 2000°C
- 2300°C
Q3: Which material is coated in tungsten electrode of a fluorescent tube lamp?
- Silver oxide
- Phosphor powder
- Fluorescent powder
- Barium and strontium oxide
Q4: Which position MB type high pressure mercury vapour lamps are operated?
- Vertical
- Inclined
- Horizontal
- Any position
Q5: What is the function of leak transformer in high pressure sodium vapour lamp circuit?
- Reduce the starting current
- Reduce the working voltage
- Increase the working voltage
- Ignite the high voltage initially
Q6: How stroboscopic effect in industrial twin tube light fitting is reduced?
- Connecting capacitor parallel to supply
- Connecting capacitor in series with supply
- Connecting capacitor in series with one tube light
- Connecting two capacitors in series to each tube light
Q7: What is the current carrying capacity of flasher, if the current is 100 mA in each row?
- 50 mA
- 100 mA
- 200 mA
- 300 mA
Q8: Which term refers that the flow of light into a plane surface?
- Lumen
- Illuminance
- Luminous flux
- Luminous intensity
Q9: What is the purpose of ignitor in high pressure sodium vapour lamp circuit?
- Decreases the starting current
- Increases the running voltage
- Decreases the running current
- Generates high voltage pulse at starting
Q10: Which type of light fitting design has free from glare?
- Semi direct type
- Semi indirect type
- Direct lighting type
- Indirect lighting type
Q11: Why the outer tube of a high pressure metal halide lamp made of boro silicate glass?
- Increase the lighting effect
- Withstand heavy temperature
- Withstand atmospheric pressure
- Reduce the ultra violet radiation from lamp
Q12: What is the term refers luminous flux given by light source per unit solid angle?
- Lumen
- Candela
- Illuminance
- Luminous intensity
Q13: What is the unit of luminous flux?
- Lux
- Lumen
- Candela
- Lumen/m
Q14: What is the unit of luminous efficiency?
- Lux
- Lumen
- Lumen/m
- Lumen/watt
Q15: How the rate of evaporation in a vacuum bulb is reduced?
- Filling inert gas
- Producing arc in bulb
- Reducing filament resistance
- Increasing filament resistance
Q16: What is the main advantage of coiled coil lamp?
- High melting point
- Higher light output
- Low operating voltage
- Low power consumption
Q17: What is the name of the reflector?
- Mirror type
- Soft light type
- Parabolic type
- Dispersive type
Q18: What is the name of light?
- Spot light
- Bulk light
- Flood light
- Flash light
Q19: Which device provides ignition voltage and act as choke in a HPSV lamp?
- Arc tube
- Sodium vapour
- Leak transformer
- High pressure aluminium oxide
Q20: What is the name of lamp?
- MAT type MV lamp
- HP metal halide lamp
- MB type HPMV lamp
- MA type HPMV lamp
Q21: Which type of lighting system is used for flood and industrial lighting?
- Direct lighting
- Indirect lighting
- Semi-direct lighting
- Semi-indirect lighting
Q22: Which is the cold cathode lamp?
- Halogen lamp
- Neon sign lamp
- Fluorescent lamp
- Mercury vapour lamp
Found a mistake or mismatch in the question or answer? Let us know via email.
This post is licensed under CC BY 4.0 by the author.