Deck 1: Lighting and Refrigeration Systems

Question 1

Which of the following instruments is used for the comparison of candle powers of different sources?

A)radiometer
B)bunsen meter
C)photometer
D)candle meter

Answer 1

photometer

Question 2

The illumination at various points on a horizontal surface illuminated by the same source varies as

A)cos3?
B)cos ?
C)1/r²
D)cos2?.

Answer 2

cos3?

Question 3

Floodlighting is NOT used for purposes.

A)reading
B)aesthetic
C)advertising
D)industrial.

Answer 3

reading

Question 4

Which of the following lamp has minimum initial cost of installation but maximum running cost ?

A)incandescent
B)fluorescent
C)mercury vapour
D)sodium vapour.

Question 5

Candela is the unit of which of the following?

A)wavelength
B)luminous intensity
C)luminous flux
D)frequency

Question 6

Colour of light depends upon

A)frequency
B)wave length
C)both (a) and (b)
D)speed of light

Question 7

Illumination of one lumen per sq. metre is called

A)lumen metre
B)lux
C)foot candle
D)candela

Question 8

A solid angle is expressed in terms of

A)radians/metre
B)radians
C)steradians
D)degrees

Question 9

The unit of luminous flux is .

A)watt/m²
B)lumen
C)lumen/m²
D)watt

Question 10

Filament lamps operate normally at a power factor of

A)0.5 lagging
B)0.8 lagging
C)unity
D)0.8 leading

Question 11

Which of the following lamps is the cheapest for the same wattage?

A)fluorescent tube
B)mercury vapour lamp
C)gls lamp
D)sodium vapour lamp

Question 12

On which of the following factors dies 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 the above factors

Question 13

For the same lumen output, the running cost of the fluorescent lamp is

A)equal to that of filament lamp
B)less than that of filament lamp
C)more than that of filament lamp
D)any of the above

Question 14

The flicker effect of fluorescent lamps is more pronounced at

A)lower frequencies
B)higher frequencies
C)lower voltages
D)higher voltages

Question 15

...... is a cold cathode lamp.

A)fluorescent lamp
B)neon lamp
C)mercury vapour lamp
D)sodium vapour lamp

Question 16

For normal reading the illumination level required is around

A)20-40 lumens/m²
B)60-100 lumens/m²
C)200-300 lumens/m²
D)400-500 lumens/m²

Question 17

Which gas can be filled in GLS lamps?

A)oxygen
B)carbon dioxide
C)xenon
D)any inert gas

Question 18

Which of the following is not the type of refrigerant?

A)organic refrigerants
B)inorganic refrigerants
C)azeotrope refrigerants
D)halo-helium refrigerants

Question 19

The refrigerants which are first cooled by-----------------refrigerants and then used for cooling purposes are known as---------------refrigerants.

A)secondary, primary
B)primary, secondary
C)tertiary, primary
D)secondary, tertiary

Question 20

Which one of the following inorganic refrigerants is often used?

A)nh3
B)CO₂
C)H₂o
D)sO₂

Question 21

From the following refrigerants, which is one of the most stable refrigerants?

A)ammonia
B)r - 12
C)carbon dioxide
D)sulphur dioxide

Question 22

In the presence of which of the following, Sulphur dioxide becomes corrosive?

A)r - 12
B)ammonia
C)water
D)carbon dioxide

Question 23

---------------------is widely used in large industrial plants such as cold storages and ice plants as per the cost basis.

A)r - 40
B)r - 717
C)r - 744
D)r - 764

Question 24

Where is the reciprocating compressor mostly suitable?

A)small displacements and low condensing pressures
B)small displacements and high condensing pressures
C)large displacements and low condensing pressures
D)large displacements and high condensing pressures