@book{30866,
	author = {Chadha, Prem R. and Chadha, Sarita},
	title = {Question bank in electronics and communication engineering :},
	publisher = {Galgotia Publications},
	year = {2009 (repr.)},
	series = {Galgotia technical educational series},
	address = {New  Delhi},
	edition = {2nd ed}
}