# Illumination MCQ Electrical Engineering

50 Questions 30 Mins

Following are some of the multiple choice questions on the Illumination with answers that will help the students in developing their knowledge.

## Illumination MCQ

• Unity
• 0.8 lagging
• 0.5 lagging
• 0.9 lagging

### 2. The polar curves are used to find out the

• MHCP
• MSCP
• Both (a) and (b)
• None of these

### 3. With increase in temperature of the body, the emission of light waves is

• Increases
• Decreases
• Remains same
• None of these

### 4. Which gas is sometimes used in filament lamps ?

• Nitrogen
• Carbon dioxide
• Aragon
• Krypton

### 5. Which off the following is present inside the fluorescent tube?

• Helium and oxygen
• Aragon and carbon dioxide
• Aragon and neon
• Mercury vapour

### 6. Lux is the unit of

• Luminous flux
• Luminous intensity
• Illumination
• Luminance

### 7. Frequency mentioned in definition of 1 Candela is

• 240 x 10^12 Hz
• 600 x 10^2 Hz
• 540 x 10^12 Hz
• 540 x 10^2 Hz

### 8. Direct lighting provide maximum light flux

• Equal to upward and downwards
• No such restriction
• downwards
• Upwards

• 961.4 lux
• 323.1 lux
• 242.0 lux
• 572.2

### 10. The illuminance of direct sunlight on Earth is about 1×1051\times10^51×105 lx. A light on a stage has an intensity in a certain direction of 5×1065\times10^65×106 cd. At what distance from the stage does a member of the audience experience an illuminance equal to that of sunlight?

•  1.4×10−1 m1.4\times10^{-1}\ m1.4×10−1 m
•  7 m7\ m7 m
•  10 m10\ m10 m
•  5×101 m5\times10^1\ m5×101 m

### 11. Halo System HTH_THT​ is a type of

• Recessed fixture
• Track lighting fixture
• Bollard fixture
• Under cabin

• 1.75x10⁵y
• 3.9x10⁹m
• 3.84x10⁸m
• 1. 7x10⁻⁵y

### 13. UGR is stands for

• Unified Glare Rating
• Unitized Group Ration
• Both A & B
• none of the above

• Electrical
• Optical
• Mechanical
• Control

• EE369
• EE361
• EE366
• EE365

### 16. SHR is

• Side to Horizontal ratio
• Space to Horizontal ratio
• Side to height ratio
• Space to Height ratio

• MSCP/MHCP
• MHCP/MSCP
• MHSCP/MSCP
• MSCP/MHSCP

• IS 10322
• IS 10632
• IS 749
• IS 3043

### 19. Average illuminance over a working plane is given by ___(Assume normal notations)

•  E = N(n.ϕ).MF.UFAE\ =\ \frac{N\left(n.\phi\right).MF.UF}{A}E = AN(n.ϕ).MF.UF​
•  E=N.(nϕ).MFA.UFE=\frac{N.\left(n\phi\right).MF}{A.UF}E=A.UFN.(nϕ).MF​
•  E=N(n.ϕ).UFA.MFE=\frac{N\left(n.\phi\right).UF}{A.MF}E=A.MFN(n.ϕ).UF​
•  E=n.ϕ.MF.UFNAE=\frac{n.\phi.MF.UF}{NA}E=NAn.ϕ.MF.UF​

### 20. Room maintenance factor is the ratio of

• Illuminance at end of maintenance period to initial illuminance
• initial illuminance to Illuminance at end of maintenance period
• Illuminance after maintenance period to initial illuminance
• Illuminance at end of few lamp failure to initial illuminance

### 21. Lamp lumen maintenance factor depends on

• Cleanness of lamp
• Hours of usage
• Aging of lamp
• All the above

### 22. Diversity in interior lighting is the ratio of

• Maximum to minimum illuminance
• Minimum to maximum illuminance
• Average to maximum illuminance
• Average to minimum illuminance

• MHSCP
• MSCP
• MHCP
• MCP

### 24. MHCP is

• Mean Hemispherical candle power
• Mean Horizontal candle power
• Mean horizontal candle point
• None of the above

• 40
• 25
• 16
• 13

• 100
• 200

• 0
• 100

• 47
• 45

### 29. A fan hanged below the LED light at a Juice store causes irritation to occupants there, technically it is known as

• Glare
• Stroboscopic effect
• Disability glare

• 400
• 500

• 600 + 9
• 600+90

### 32. Math is...

• fun :-)
• the greatest!!
• Both A & B
• none of the above

• 500+70+9
• 500 + 79

### 34. Lambert's cosine law is

• Eθ2 α EmCosθE_{\theta}^2\ \alpha\ \ E_mCos\thetaEθ2​ α Em​Cosθ
• Eθ α EmCosθE_{\theta}\ \ \alpha\ \ E_mCos\thetaEθ​ α Em​Cosθ
• Em α EθCosθE_m\ \ \alpha\ \ \ E_{\theta}Cos\thetaEm​ α Eθ​Cosθ
• Eθ α Cosθ EmE_{\theta}\ \ \alpha\ \frac{\ \ Cos\theta}{\ E_m}Eθ​ α Em​ Cosθ​

• 900
• 1,000

• 400+3
• 400 + 30

• 0.0177
• 35156.25
• 0.666
• 937.5

### 38. Inverse square law is ____ (Assume normal notations)

• E2 α 1d2E^2\ \alpha\ \frac{1}{d^2}E2 α d21​
• I α 1d2I\ \alpha\ \frac{1}{d^2}I α d21​
• I2 α 1d2I^2\ \alpha\ \frac{1}{d^2}I2 α d21​
• I2 α d2I^2\ \alpha\ d^2I2 α d2

### 39. Textiles shops uses slightly different colored lamps in there show rooms

• To please customer
• To increase glare
• To avoid glare
• To improve color rendering

• 300
• 400

• 200
• 300

### 42. One candela is 1/___________ of luminous intensity per centimeter square of black body radiating at _______________ Kelvin temperature

• 60, 2049
• 60, 2046
• Both A & B
• none of the above

• 700+40+2
• 740 + 2

• 600
• 700

### 45. In electromagnetic spectrum the visible light region lies between

• 380 nm to 800 nm
• 50 nm to 100 nm
• 800 nm to 1000 nm
• below 50 nm

### 46. Human eye is most sensitive to ___ with same intensiy

• Violet region
• Green region
• Reg region
• Equal sensitivity in all light region

• 570
• 580

• 460
• 470

• 26
• 24

• 50
• 60