# The magnitude-frequency response of a control system is shown in the figure. The value of ω1 and ω2 are respectively

1.  10 and 200

2.   20 and 200

3.  20 and 400

4.  100 and 400

4

100 and 400

Explanation :
No Explanation available for this question

# A hertzian dipole has a radiation pattern with

1.   A null in the direction of the dipole

2.  A null in the plane perpendicular to the dipole

3.   A peak in the direction of the dipole

4.  None of the above

4

A null in the direction of the dipole

Explanation :
No Explanation available for this question

# A non-resonant antenna is characterised by

1.  Antenna being terminated in a resistance

2.  The presence of only the forward travelling wave and absence of standing waves

4.  All the above

4

All the above

Explanation :
No Explanation available for this question

# A resonant antenna is characterised by

1.  Behaves like an antenna array

2.  Is nothing but Marconi antenna

3.  Acts as a single antenna of twice the height

4.  Is a horizontally polarized antenna

4

Is a horizontally polarized antenna

Explanation :
No Explanation available for this question

# An ungrounded antenna near the ground

1.  Behave like an antenna array

2.  Is nothing but Marconi antenna

3.  Acts as a single antenna of twice the height

4.   Is a horizontally polarized antenna

4

Behave like an antenna array

Explanation :
No Explanation available for this question

# The Thevenin equivalent of a network is as shown in the given figure. For maximum power transfer to the variable and purely resistive load RL its resistance should be

1.  60 Ω

2.  80 Ω

3.  100 Ω

4.  infinity

4

100 Ω

Explanation :
No Explanation available for this question

# A linear second-order system with the transfer functionis initially at rest and is subjected to a step input signal. The response of the system will exhibit a peak overshoot of

1.  16%

2.  9%

3.   2%

4.   Zero

4

9\%

Explanation :
No Explanation available for this question

# A half wave dipole at frequency of 100 MHz has a length of

1.   100m

2.  3 m

3.  1.5 m

4.  0.75 m

4

1.5 m

Explanation :
No Explanation available for this question

# Antenna which does not depends on frequency

1.  Yagi—uda

2.  Folded-diple

3.  Log periodic antenna

4.  None of the above

4

Yagi—uda

Explanation :
No Explanation available for this question

# If i(t) =(1/4) (1-e-2t) u(t), where u(t) is a unit step voltage, then the complex frequencies associated with i(t) would include

1.  s = 0 and s = j2

2.  s = j2 and s= -j2

3.  s = -2j and s = -2

4.  s = 0 and s = -2

4