# Consider  the  amplitude  modulated  (AM)  signal  Ac  cos ct  +  2cos ? m  tcos?ct.  For demodulating the signal using envelope detector, the minimum value of Ac should be

1.  2

2.  1

3.  0.5

4.  0

4

2

Explanation :
No Explanation available for this question

# A plane wave having the electric field components and traveling in free space is incident normally on a lossless medium with μ=μ0 and ε=9ε0 . The reflected magnetic field component is given by

1.

2.

3.

4.

4 Explanation :
No Explanation available for this question

# In the circuit shown, all the transmission line sections are lossless. The Voltage Standing Wave Ration(VSWR) on the 60Ω line is

1.  1.00

2.  1.64

3.  2.50

4.  3.00

4

1.64

Explanation :
No Explanation available for this question

# The order of differential equation(d2y/dt2)+(dy/dt)3+y4=e-t is

1.  1

2.  2

3.  3

4.  4

4

2

Explanation :
No Explanation available for this question

# The Fourier series of a real periodic function has only P.  Cosine terms if it is even Q.  Sine terms if it is even R.  Cosine terms if it is odd S.   Sine terms if it is odd Which of the above statements are correct

1.  P and S

2.  P and R

3.  Q and S

4.  Q and R

4

P and S

Explanation :
No Explanation available for this question

# Afunction is given f(t)=sin2t+cos2t which of the following is true

1.  f has frequency components at 0 and 1/2π HZ

2.  f has frequency components at 0 and 1/π HZ

3.  f has frequency components at 1/2π  and 1/π HZ

4.  f has frequency components at 0 and 1/2π  and 1/π HZ

4

f has frequency components at 0 and 1/π HZ

Explanation :
No Explanation available for this question

# X is zero. Which of the following statements is true

1.  P11P22 -  P12P21 = 1

2.  P11P22 -  P12P21 = -1

3.  P11P22 -  P12P21 = 0

4.  P11P22 +  P12P21 = 0

4

P11P22 -  P12P21 = 0

Explanation :
No Explanation available for this question

# In the following ciruit, the switch S is closed at t = 0. The rate of change of current (di/dt) (0+) is given by

1.  0

2.  (RsIs)/L

3.  ((R + Rs)Is)/L

4.  ∞

4

(RsIs)/L

Explanation :
No Explanation available for this question

# Step  responses of a set of  three second-order underdamped systems all have  the percentage overshoot. Which of  the  following diagrams  represents  the poles of  the systems

1.

2.

3.

4.

4 Explanation :
No Explanation available for this question

# The Thevenin equivalent impedance Zth between the nodes P and Q in the following circuit Is

1.  1

2.  1 + s + (1/s)

3.  2 + s + (1/s)

4.  (s2 + s + 1)/(s2 + 2s + 1)

4