# Impedance inversion may be obtained with

1.  A short circuited stub

2.   An open-circuited stub

3.  A quarter-wav line

4.  A half-wave line

4

A quarter-wav line

Explanation :
No Explanation available for this question

# The characteristic impedance of a transmission line is

1.   Directly proportional to its length

2.  Inversely proportional to its length

3.  Independent of its length

4.  None of these

4

Independent of its length

Explanation :
No Explanation available for this question

# Maxwell’s divergence equation for the magnetic field is given by

1.  ∇ x B = 0

2.  ∇. B = 0

3.  ∇ x B = ρ

4.  ∇. B = ρ

4

∇. B = 0

Explanation :
No Explanation available for this question

# Short-circuited stubs are preferred to open-circuited stubs because the latter are

1.  More difficult to make and correct

2.   Made of a transmission line with a different characteristic impedance

4.  Incapable of giving a full range of reactances

4

Made of a transmission line with a different characteristic impedance

Explanation :
No Explanation available for this question

# A circular loop has its radius increasing at a rate of 2 m/s. The loop is placed perpendicular to a constant magnetic field of 0.1 Wb /m2. When radius of the loop is 2m, the emf induced in the loop will be

1.  0.8 πV

2.  0.4 πV

3.  0.2 πV

4.  zero

4

0.8 πV

Explanation :
No Explanation available for this question

# A helical antenna is used for satellite tracking because of its

1.  Circular polarization

2.  Maneuverability

4.  Good front-to-back-ratio

4

Circular polarization

Explanation :
No Explanation available for this question

# When electromagnetic waves are propagated in a waveguide

1.  They travel along the broader walls of the guide

2.  They are reflected from the walls but do not travel along them

3.  They travel through the dielectric without touching the walls

4.  They travel along all four walls of the waveguide

4

They are reflected from the walls but do not travel along them

Explanation :
No Explanation available for this question

# A rectangular loop in the x-z plane bounded by the lines x=0, x=a, z=0 and z=b, is in a time varying magnetic field given by Where B0 is a constant, is the angular frequency and y is the unit vector in the y-direction. The emf induced in the loop is given by

1.  ab B0 cos ωt

2.  ab B0 sin ωt

3.  B0 ω sin ωt

4.  zero

4

ab B0 sin ωt

Explanation :
No Explanation available for this question

# Waveguides are used mainly for microwave signals because

1.  They depend on straight-line propagation which applies to microwaves only

2.  Losses would be too heavy at lower frequencies

3.  There are no generators powerful enough to excite them at lower frequencies

4.  The would be too bulky at lower frequencies

4

The would be too bulky at lower frequencies

Explanation :
No Explanation available for this question

# The input impedance of a loss-less transmission line is 100 ohms when terminated in a short circuit, and 64 ohms when terminated in an open circuit. The characteristic impedance of the line is

1.  80 ohms

2.  164 ohms

3.  36 ohms

4.  64 ohms

4

80 ohms

Explanation :
No Explanation available for this question

## Interview Questions

 MongoDB Java Script Node JS PHP JQuery Python