ELECTRICIAN IN ENGLISH Quiz - 842


The earths potential is taken as
  
    1 volt
    zero.
    infinite
    supply voltage

zero.

For an EHV equipment for maintenance first it should be isolated and connected to ground because
  
    both (and
    to provide low impedance
    to discharge the charging capacitance to ground
    protection for operating personnel

both (and

When earth fault occurs
  
    none of the above
    voltage potential at the earth mat remains zero irrespective of fault
    voltage potential at the earth mat decreases due to grounding
    voltage potential at the earth mat increases due to grounding

voltage potential at the earth mat increases due to grounding

The objective of earthing or grounding is
  

    to provide as high resistance possible to the ground
    to provide flow of positive negative and zero sequence currents
    to provide as low resistance possible to the ground
    none of the above

to provide as low resistance possible to the ground

Moisture content in the soil __ the earth soil resistance
  
    decrease
    none of the above
    does not affect
    increase

decrease

Factors on which soil resistance depends
  
    all the above
    moisture
    depth of the electrode
    Nacl

all the above

Radiant efficiency of the luminous source depends on
  
    all of the above.
    temperature of the source
    shape of the source
    wavelength of light rays

temperature of the source

Light waves travel with a velocity of
  
    3 x 1010cm/s
    3 x 1012cm/s
    3 x 1015 cm/s
    3 x 1018 cm/s.

3 x 1010cm/s

Carbon arc lamps are commonly used in
  
    photography.
    street lighting
    domestic lighting
    cinema projectors

cinema projectors

The unit of solid angle is
  
    solid angle
    radian
    steradian
    candela.

steradian


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