Power Systems
Which of the following relays is/are unit protection relays?

 Buccholz relays
 both 1 and 2
 over current relays
 Differential relays

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Power Systems
A thermal power station needs space

 less than that required by the diesel power station of same output.
  less than that required by hydro-power station of same capacity.
 less than that required by a gas turbine power plant of same output.
 less than that required by atomic power station of the same output.

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Power Systems
The VSWR of transmission line is

 Proportional to load and characteristic impedance.
 Directly proportional to voltage minimum and inversely proportional to voltage maximum.
  Directly proportional to load impedance and inversely to characteristic impedance.
 Directly proportional to characteristic impedance and inversely to load impedance.

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Power Systems
The value of off diagonal elements is

 sum of admittances connected at bus i
 sum of admittances connected at bus j
 which is connected between bus i and bus j with negative sign
 which is connected between bus i and bus j with positive sign

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