# .A polynomial F(x)=a4x4+a3x3+a2x2+a1x-a0 with all coefficient positive has

1.  no real roots

2.  no negative real root

3.  odd number of real roots

4.  at least one positive and one negative real root

4

at least one positive and one negative real root

Explanation :
No Explanation available for this question

# Assuming zero initial condition, the response y(t) of the system given below to a unit step input u(t)is

1.  u(t)

2.  t u(t)

3.  t2/2  u(t)

4.  e –t u(t)

4

t u(t)

Explanation :
No Explanation available for this question

# The transfer function v2(s)/v1(s) o f the circuit shown below is

1.  0.5s+1/s+1

2.  3s+6/s+2

3.  s+2/s+1

4.  s+2/s+1

4

s+2/s+1

Explanation :
No Explanation available for this question

# A source  of  V1(t)=V cos 100 π has an internal impedance of (4+j3) If a purely resistive load connected to this source has to extract the maximum power out of the source, its value in ? should be

1.  3

2.  4

3.  5

4.  7

4

5

Explanation :
No Explanation available for this question

# The return loss of a device is found to be 20 dB. The voltage standing wave ratio (VSWR) and magnitude of reflection coefficient are respectively

1.  1.22 and 0.1

2.  0.81 and 0.1

3.  −1.22 and 0.1

4.  2.44 and 0.2

4

1.22 and 0.1

Explanation :
No Explanation available for this question

# Let g(t)=e –t  and h(t) is  filter matched to g(t). is applied as input to h( t), then the Fourier transform of the output is

1.  e-πf2

2.  e-πf2/2

3.  e-πf?

4.  e-2πf2

4

e-2πf2

Explanation :
No Explanation available for this question

# Let U and V  be two independent zero mean Gaussian random variables of variances1/4 and1/9 respectively. The probability p(3V≥2U) is

1.  4/9

2.  1/2

3.  2/3

4.  5/9

4

1/2

Explanation :
No Explanation available for this question

# Let  A be the M*n matrix  and B an n* m matrix. It is given that determinant (Im+AB)=Determinent of (In+BA) where Ik is the  K*k identity matrix Using the above property, the determinant of the matrix given below is

1.  2

2.  5

3.  8

4.  16

4

5

Explanation :
No Explanation available for this question

# In the circuit shown below, if the source voltage vs=100

1.  100

2.  800

3.  800

4.  100

4

800<90?

Explanation :
No Explanation available for this question

1.  1

2.  5

3.  10

4.  100

4