The beam of a radar should be very narrow very wide neither too narrow nor very

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very narrow

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4. At a frequency equal to cutoff frequency in a rectangular wave guide
Options
A. the flow of electromagnetic energy is zero
B. the flow of electromagnetic energy is infinite
C. the flow of electromagnetic energy is 50% of maximum
D. the flow of electromagnetic energy is 10% of maximum

5. A directional coupler is used
Options
A. to transmit microwave signals
B. to generate microwave signals
C. to measure amplitude and phase of a travelling wave
D. both (a) and (b)

7. In a klystron amplifier the transit time of electron passing the gap in the cavity should be
Options
A. less than one cycle
B. less than half cycle
C. less than quarter cycle
D. more than quarter cycle

8. Consider the following statements about hybrid ring
1. Ports 1 and 2 are decoupled.
2. Port 3 and 4 are coupled.
3. A signal entering either port 1 or 2 splits equally between ports 3 and 4.
4. A signal entering either port 3 or 4 splits equally between ports 1 and 2.
Which of the above are correct?
Options
A. 1, 2, 3 and 4
B. 1, 3 and 4
C. 1 and 2
D. 2, 3 and 4

9. Match the following:

List I List II

A. e^-t ? (t) 1.

B. 2. j? X(?)

C. 3.

D. 4.
Options
A. A-1, B-4, C-2, D-3
B. A-3, B-2, C-4, D-1
C. A-1, B-2, C-4, D-3
D. A-3, B-4, C-2, D-1

10. Match the following:

	List I		List II
A.	(? x E)ds = 0	1.	Continuity equation
B.	rv.dv = Q	2.	Ampere's law
C.	(J + D)ds	3.	Gauss law
D.	-r_vdv	4.	Faraday's law
E.	H.dl = (? x H)ds	5.	Stoke's theorem

Options
A. A-4, B-3, C-2, D-1, E-5
B. A-1, B-2, C-3, D-4, E-5
C. A-4, B-2, C-1, D-3, E-5
D. A-1, B-5, C-4, D-2, E-3

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