# Antenna radiation efficiency is increased by

1.  Use of larger section of conductor

2.  Providing insulation on conductor

4.  All the above

4

Explanation :
No Explanation available for this question

# Higher the radius of constant SWR circle on smith chart

1.  Lower is the impedance mismatch

2.  Higher is the magnitude of reflection con-efficient

3.  Higher is the permittivity of the transmission line dielectric

4.  Lower is the propagation velocity

4

Higher is the magnitude of reflection con-efficient

Explanation :
No Explanation available for this question

# A loop antenna is a commonly used for

2.  Direction finding

3.  Satellite communication

4.  All the above

4

Direction finding

Explanation :
No Explanation available for this question

# If the maximum linear dimension of an antenna is not large as compared to (λ), then the region which may exist is

1.  Far field region

2.  Induction field region

3.  Both (a) and (b) above

4.  None of these

4

Induction field region

Explanation :
No Explanation available for this question

# In order to convert a transmission line into a radiating antenna for coupling to free space, it is necessary that

1.  Line be open circuited

2.  Line be short circuited

3.  The receiving ends be bent outward at right angle to the line

4.  None of the above

4

The receiving ends be bent outward at right angle to the line

Explanation :
No Explanation available for this question

# The shunt admittance of a transmission line is given by

1.  λ = R+ jωL

2.  λ = R - jωL

3.  λ = G+jωC

4.   λ = jωGC

4

λ = G+jωC

Explanation :
No Explanation available for this question

# If the maximum linear dimension of an antenna (D) is large as compared to (λ), then the far field region can be taken to exist at distances

1.  Greater than

2.  Less than

3.  Greater than

4.  Less than

4

Greater than

Explanation :
No Explanation available for this question

# The region of the field of antenna between the antenna and the far field region where the radiation fields predominate and where angular field distribution is dependent upon radial distance from the antenna, is

1.  Cross-over region

2.  Reactive near field region

4.  Far field region

4

Explanation :
No Explanation available for this question

# A periodic function f(t) having a time period T, repeats itself after half time period T/2. The Fourier series of f(t) would contain

1.  cosine terms only

2.  sine terms only

3.  odd harmonic terms only

4.  even harmonic terms only

4

even harmonic terms only

Explanation :
No Explanation available for this question

# An antenna couple is used due to

1.  Discriminate against harmonics

2.  Make the antenna look resistive

3.  Provide the output amplifier with the correct load impedance

4.   All the above

4