83) You have to measure the current and voltage of a 3 phase circuit of 6.6 kV and load of 500 kVA. In order to use a 5 A ammeter and 110 volts voltmeter, what is the ratio of CT and PT required ?

84) In a small workshop 5 A energy meter is connected through a CT. The meter reader recorded 1000 units for a particular month but, the meter shows only 25 units. What is the current in primary of CT when a current of 4 A is flowing through the meter ?

85) The standard rated value of secondary current of current transformer as per IS 2705 (part I) -1981 shall be either :

86) The standard values of rated secondary current of the current transformer is

87) The rated secondary voltage of a single phase potential transformer is :