Gate previous questions with solutions

Q1.	If  |9y−6| =3, then  y2−4y/3  is			.
	(A) 0	(B) +1/3		(C) −1/3	(D) undefined

 ans:   -1/3(squaring on both sides and solve it)

 Q2.     If ( z + 1 / z )²  = 98, compute (z ²  + 1 / z² )

ans:     96

Q3.  Power consumed by a balanced 3–phase, 3–wire load is measured by the two watt meter method. The first watt meter reads twice that of the second. Then the load impedance angle in radians is

 ans:   π/6
 Q4.     A cascade of three identical modulo–5 counters has an overall modulus of 

ans: 125