Microwave engineering miscellaneous Easy Questions and Answers

Microwave engineering miscellaneous

1. Low attenuation coefficient
1. High attenuation coefficient
1. High VSWR
1. Low VSWR

The Power ‘P_t’ transmitted by an antenna is being received by another antenna at a distance ‘r’ and at a power level ‘P_r’ with reference to this, which one of the following statements is true?
[D_t and D_r represent the gain of the transmitting and the receiving antennas respectively]
P_r/P_t is:

In a travelling-wave tube, the phase velocity of the axial component of the rf field on the slow-wave structure is kept:

1. Equal to the velocity of the electrons
1. Slightly less than the velocity of electrons
1. Slightly more than the velocity of electrons
1. Equal to the velocity of light in free space

Consider the following statements regarding a cavity wavemeter in a reaction type of circuit as shown in Fig.
1. The distance d is made either zero or approximately a guide half-wave length, so that an effective short circuit appears at the waveguide wall when the cavity is at resonance.
2. A dip in the load power occurs as the wavemeter is tuned through resonance.
3. The magnitude of the cavity impedance depends only on the distance d.
4. The magnitude of the power dip depends only on the Q of the cavity.

1. 1 alone is correct
1. 2 alone is correct
1. 1 and 3 are correct
1. 2 and 4 are correct

	λ		²
	4πr