Q.1
Which gas can be filled in GLS lamps?
  • oxygen
  • carbon dioxide
  • xenon
  • any inert gas
Q.2
When a body reflects entire radiation incident on it, then it is known as
  • white body
  • grey body
  • black body
  • transparent body
Q.3
Which of the following best represents the Law of Conservation of Energy?
  • Energy CAN be created but NOT destroyed
  • Energy CAN be destroyed but NOT created
  • Energy can NOT be created Nor destroyed
  • Energy CAN be created and CAN destroyed
Q.4
Which of the following decreases within turn decreases the charging rate?
  • temperature
  • pressure
  • enthalpy
  • entropy
Q.5
On which of the following factors dies the depreciation or maintenance factor depend?
  • lamp cleaning schedule
  • ageing of the lamp
  • type of work carried out at the premises
  • all of the above factors
Q.6
Which one of the following inorganic refrigerants is often used?
  • nh3
  • co2
  • h2o
  • so2
Q.7
What kind of energy in the sun transforms into electromagnetic energy?
  • nuclear
  • thermal
  • electric
  • chemical
Q.8
The basic electrical requirement in arc welding is that there should be
  • coated electrodes
  • high open-circuit voltage
  • no arc blow
  • power supply.
Q.9
What is the total number of cells present in a 12-volt battery?
  • 5
  • 6
  • 3
  • 4
Q.10
The flicker effect of fluorescent lamps is more pronounced at
  • lower frequencies
  • higher frequencies
  • lower voltages
  • higher voltages
Q.11
According to the Law of Conservation of Energy, when one form of energy is transformed into another, __________ energy is lost in the process
  • no
  • some
  • all
  • None of these
Q.12
Which of the following has the highest value of thermal conductivity?
  • water
  • steam
  • solid ice
  • melting ice
Q.13
Heat is transferred simultaneously by condition, convection and radiation
  • inside boiler furnaces
  • during melting of ice
  • through the surface of the insulted pipe caring steam
  • from refrigerator coils to freezer of a refrigerator
Q.14
The coreless induction furnace uses high-frequency electric supply in order to obtain high
  • flux density
  • eddy-current loss
  • primary resistance
  • power factor.
Q.15
The refrigerants which are first cooled by ________________  refrigerants and then used for cooling purposes are known as _________________ refrigerants.
  • secondary, primary
  • primary, secondary
  • tertiary, primary
  • secondary, tertiary
Q.16
Which of the following track is electrified
  • delhi-bombay
  • delhi-madras
  • delhi-howrah
  • delhi-ahmedabad
Q.17
Which of the following lamps is the cheapest for the same wattage?
  • fluorescent tube
  • mercury vapour lamp
  • gls lamp
  • sodium vapour lamp
Q.18
___________ is a cold cathode lamp.
  • fluorescent lamp
  • neon lamp
  • mercury vapour lamp
  • sodium vapour lamp
Q.19
Which is an example of a single energy transformation?
  • A toaster converts electrical to thermal energy
  • A match converts mechanical to thermal to electromagnetic
  • A biker converts chemical to mechanical to thermal
  • A car converts chemical to thermal to mechanical
Q.20
Ground resistance value for sensitive installations is
  • less than 5 Ω
  • more than 5 Ω
  • equal to 50 Ω
  • any of above
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