Mc Murray full bridge inverter uses 4 thyristors and 2 diodes 4 thyristors and 4

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8 thyristors and 4 diodes

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1. Match the following:

	List I (Location of characteristics roots)		List II (System characteristic)
A.	(- 1 + j), (- 1 - j)	1.	Marginally stable
B.	(- 2 + j), (- 2 - j), (2, j) (- 2, j)	2.	Unstable
C.	- j, j - 1, 1	3.	Stable

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

2. Match the following:

	List I		List II
A.	SUS	1.
B.	SBS	2.
C.	SCS	3.
D.	Shockley diode	4.

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

3. Match the following:

	List I		List II
A.	Sky wave	1.	parasitic elements
B.	Antenna feed	2.	delta match
C.	Reflector	3.	long-wire antenna
D.	Rhombic antenna	4.	ionosphere

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

4. In mode filter of the given figure which of the following modes is unaffected
Options
A. TE₀₁
B. TE₁₀
C. TE₁₁
D. all TM

6. A duplexer is used to
Options
A. couple two antennas to a transmitter
B. isolate the antenna from the local oscillator
C. prevent interference between two antennas connected to receiver
D. use an antenna for reception or transmission without interference

8. Consider the following statements
1. Dissipative attenuator has a fixed value of attenuation.
2. Reflective attenuator has a fixed value of attenuation.
3. Both dissipative and reflective attenuators are available only with fixed attenuation.
4. Both dissipative and reflective attenuators are available with either fixed or variable attenuation.
Which of the above are correct?
Options
A. 1 only
B. 1 and 2
C. 1, 2 and 3
D. 4 only

10. Roughly the time required for microwave cooking as compared to conventional cooking is
Options
A. about twice
B. about half
C. about 10 times
D. about one-tenth

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