A Best Way To Crack Gorenment Job Exams

Electronics Engineering Objective Questions { Digital Communication System }

169. The shape-factor of a filter-response
A. cannot be applied to crystal filters
B. is the same as the peak-to-valley ratio
C. determines the adjacent-channel selectivity of the filter
D. is equal to the 60 dB bandwidth of a mechanical filter
Discuss in Forum

170. In adiode, shot noise current is proprotional to, where I = D.C. diode current
A. Ip
B. Ip2
D. Ip3r2
Discuss in Forum

171. With reference to 'Time division complex' which of the following statements is correct?
A. It interleaves pulses belonging to different transmissions
B. It can be usedwith PCM only
C. It stacks several channels in adjecent frequency slots
D. It combines five groups into a single super group
Discuss in Forum

172. Which one of the following types of noise gains importance at high frequency?
A. Shot noise
B. Random noise
C. Impulse noise
D. Transit?time noise
Discuss in Forum

173. The 'Wise figure of an amplifier is 3 dB. Its noise temperature will be about
A. 145 K
B. 290 K
D. 870 K
Discuss in Forum

174. Noise voltage varies ma resistor as
B.41117---FR B
C. 42.;-1/7-313
Discuss in Forum

175. The rms noise voltage of an amplifier due to aninput resistor is 20 microvolts in a bandwidth of 2 HMz. If the operating bandwidth is doubled, the noise voltage will become (rounded to nearest whole number).
A. 40 microvoltas
B. 35 microvolts
C. 30 microvolts
D. 20 microvolts
Discuss in Forum

Page 25 of 37

« 23 24  25  2627 »