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
पोस्ट अच्छी लगी हो तो प्लीज नीचे दिए गए लिंक पर क्लिक कर शेयर जरुर करें
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