Which of the following is taken as reference antenna for directive gain? Half wa

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Question
Which of the following is taken as reference antenna for directive gain?
Options
A. Half wave dipole
B. Elementary doublet
C. Isotropic
D. Infinitesimal dipole

Correct Answer

Isotropic

Explanation

Isotropic antenna is one which radiates equally in all directions. It is a standard reference antenna.

Communication Systems problems

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2. Decimal 43 in hexadecimal and BCD number system is respectively.
Options
A. B2, 01000011
B. 2B, 01000011
C. 2B, 00110100
D. B2, 01000100

3. A counter type A/D converter contains a 4 bit binary ladder and a counter driven by a 2 MHz clock. Then conversion time
Options
A. 8 ? sec
B. 10 ? sec
C. 2 ? sec
D. 5 ? sec

4. The basic storage element in a digital system is
Options
A. flip flop
B. counter
C. multiplexer
D. encoder

5. Minimum number of 2-input NAND gates required to implement the function F = (x + y) (Z + W) is
Options
A. 3
B. 4
C. 5
D. 6

7. An earth mat for a communication tower consists of
Options
A. one or two radials extending from base of tower at a depth of about 5 cm below ground
B. a large number of radials extending from base of tower at a depth of about 3 m
C. a large number of radials extending from base of tower at a depth of about 30 cm
D. none of the above

8. In CCIR-B system, the time between start of one H syn. pulse and next is
Options
A. 64 ?s
B. 6.4 ?s
C. 640 ?s
D. 0.64 ?s

9. A cordless telephone using separate frequencies for transmission in base and portable units is known as
Options
A. duplex arrangement
B. half duplex arrangement
C. either (a) or (b)
D. neither (a) nor (b)

10. Signal to noise ratio of microphone is defined as the ratio of output when the sound pressure is __________ to the output in the absence of any sound signal.
Options
A. 0.5 Pa
B. 0.2 Pa
C. 0.1 Pa
D. 0.01 Pa

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