Question 1

Floodlighting is NOT used for purposes.

Accepted Answer

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

Question 2

Colour of light depends upon

Accepted Answer

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

Question 3

Candela is the unit of which of the following?

Accepted Answer

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

Question 4

The flicker effect of fluorescent lamps is more pronounced at

Accepted Answer

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

Question 5

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

Accepted Answer

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

Question 6

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

Accepted Answer

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

Question 7

Which of the following is not the type of refrigerant?

Accepted Answer

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

Question 8

Where is the reciprocating compressor mostly suitable?

Accepted Answer

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

Question 9

Which one of the following inorganic refrigerants is often used?

Accepted Answer

A)  nh3
B)  CO2
C)  H2o
D)  sO2

Question 10

A solid angle is expressed in terms of

Accepted Answer

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

Question 11

Filament lamps operate normally at a power factor of

Accepted Answer

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

Question 12

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

Accepted Answer

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

Question 13

Illumination of one lumen per sq. metre is called

Accepted Answer

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

Question 14

On which of the following factors dies the depreciation or maintenance factor depend?

Accepted Answer

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 15

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

Accepted Answer

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

Question 16

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

Accepted Answer

A)  cos3?
B)  cos ?
C)  1/r2
D)  cos2?.

Question 17

For normal reading the illumination level required is around

Accepted Answer

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

Question 18

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

Accepted Answer

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

Question 19

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

Accepted Answer

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

Question 20

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

Accepted Answer

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

Exam 1: Lighting and Refrigeration Systems