Q.1
Copper behaves as a
  • a) Conductor always
  • b) Conductor or dielectric depending on the applied electric field strength
  • c) Conductor or dielectric depending on the frequency
  • d) Conductor or dielectric depending on the electric current density
Q.2
In a good conductor the phase relation between the tangential components of electric E and the magnetic field H is as follows
  • a) E and H are in phase
  • b) E and H are out of phase
  • c) H leads E by 90
  • d) E leads H by 45
Q.3
For an electromagnetic wave incident from one medium to a second medium, total internal reflection takes place when
  • a) Angle of incidence is equal to the Brewster angle with E field perpendicular to the plane of incidence
  • b) Angle of incidence is equal to the Brewster angle with E field parallel to the plane of incidence
  • c) Angle of incidence is equal to the critical angle with the wave moving from the denser to rarer medium
  • d) Angle of incidence is equal to the critical angle with the wave moving from the rarer to denser medium
Q.4
For maximum power transfer, a lossless transmission lineohm is to be matched to a resistive load impedance ofohm. The characteristic impedance of the wavelength/4 transformer is
  • a) 70.7
  • b) 50
  • c) 100
  • d) Infinity
Q.5
In an impedance Smith chart , a clockwise movement along a constant resistance circle gives rise to
  • a) Decrease in reactance
  • b) Increase in reactance
  • c) No change in reactance
  • d) No change in impedance
Q.6
A transmission line is distortionless if
  • a) RL = 1/GC
  • b) RL = GC
  • c) LG = RC
  • d) RG = LC
Q.7
A lossless line havingohm characteristic impedance and length wavelength/4 is short circuited at one end connected to an ideal voltage source ofat the other end. The current drawn from the voltage sources is
  • a) 0
  • b) 0.02
  • c) Infinity
  • d) 50
Q.8
The capacitance per unit length and the characteristic impedance of a lossless transmission line are C and Z respectively. The velocity of a travelling wave on the transmission line is
  • a) ZC
  • b) 1/ZC
  • c) Z/C
  • d) C/Z
Q.9
The minimum distance of the stub from the load side is 5 cm. Calculate the guided wavelength of the transmission line.
  • a) 5 cm
  • b) 2.5 cm
  • c) 10 cm
  • d) 1.25 cm
Q.10
One end of a lossless transmission line having the characteristic impedance ofohm and length of 1 cm is short circuited. At 3 GHz, the input impedance at the other end of the transmission line is
  • a) 0
  • b) Resistive
  • c) Inductive
  • d) Capacitive
0 h : 0 m : 1 s