The number of noise sources in a BJT are 3 2 1 4 Shot noise, partition noise and

CuriousTab

CuriousTab

Home Aptitude

Discussion

Home ‣ Electronics and Communication Engineering ‣ Communication Systems Comments

Question
The number of noise sources in a BJT are
Options
A. 3
B. 2
C. 1
D. 4

Correct Answer

3

Explanation

Shot noise, partition noise and thermal noise.

Communication Systems problems

Search Results

1. 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

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

4. 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

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

6. 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

7. 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

8. 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)

9. 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

10. Some types of traps used in video IF amplifier of colour TV are
Options
A. shunt traps
B. series traps
C. absorption traps
D. all of the above

Comments

There are no comments.

More in Electronics and Communication Engineering: