1.
What allow microwave to pass in only one direction?

2.
The aquadag coating on the inside of PPI tube is used

3.
The antenna separations (in meters) required for optimum operation of a space diversity system can be calculated from:
where R = effective earth radius (m) and L = path length (m)

4.
When it is desired that short-range targets be clearly seen on a pulsed-radar set, it is important that the receiver and display system have

5.
Coupling into and out of a traveling-wave tube can be accompanied by a

6.
A high-power microwave pulse of the order of megawatts can be generated by a

7.
It is possible to increase the maximum range of a radar equipment by

8.
A PPI cathode-ray tube as used on a radar set

9.
Oscillators of a klystron tube are maintained

10.
If the instantaneous RF potentials on the two sides of a magnetron cavity are of opposite polarity, the operation is in the

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