27) As per Indian electricity standard, what is the allowable voltage variation in low or medium voltage supply

28) According to which law, the back emf in DC motor opposes the applied voltage

29) The value of 97 x 97 + 2 x 97 x 3 + 9 is

30) An ideal transformer has 2000 turns on its primary and 200 turn on its secondary. The driving voltage in the primary side is 100 V. A 5 Ohm resistor is connected to the secondary. Calculate the secondary current.

31) The impedance ratio of transformer is equal to