Exam (elaborations)
BNSF TELECOM 1 QUESTIONS AND ANSWERS 2024
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BNSF TELECOM 1 QUESTIONS AND ANSWERS 2024
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BNSF TELECOM 1What is dB and how much power is it - ANSWERS-dB is a decibel and measures
1/10 of a bell
What is an acceptable return loss - ANSWERS--14 dB or better (-15,-16,-17 etc
would be worse)
4% or 1.5:1
Return loss formula in dB -6 - ANSWERS-dB=10*log(power out/power in)
25% reflective power or 3:1
Return loss formula in dB -9 - ANSWERS-dB=10*log(power out/power in)
11% reflective power or 2:1
Return loss formula in dB -20 - ANSWERS-dB=10*log(power out/power in)
1% reflective power or 1:22
Return loss formula in dB -30 - ANSWERS-dB=10*log(power out/power in)
Less than 1%
,VHF - Low and High range
Very High Frequency - ANSWERS-Low is 30 to 50 MHz
High is 150 to 300 MHz
UHF - Ultra High Frequency - ANSWERS-300 MHz - 3 GHz
Super High Frequency - SHF - ANSWERS-3-30 GHz
Extremely High Frequency - EHF - ANSWERS-30-300 GHz
Legacy Band - ANSWERS-25 kHz wide channel
Very Narrowband - ANSWERS-6.25 kHz wide, digital
Narrowband - ANSWERS-12.5 kHz wide analog
Tera (T) to Base - ANSWERS-10^12
Giga (G) to Base - ANSWERS-10^9
Mega (M) to Base - ANSWERS-10^6
,Kilo (K) to Base - ANSWERS-10^3
Milli (m) to Base - ANSWERS-10^-3
Micro (u) to Base - ANSWERS-10^-6
Convert 44 dBm to Watts - ANSWERS-Watts= 10^((P-30)/10)
25.11 Watts
50 dBm is defined as __________ watts - ANSWERS-100 W
47 dBm is defined as __________ watts - ANSWERS-50 W
30 dBm is defined as __________ watts - ANSWERS-1000 mW or 1 W
33 dBm is defined as __________ watts - ANSWERS-2 W
40 dBm is defined as __________ watts - ANSWERS-10 W
20 dBm is defined as __________ watts - ANSWERS-100 mw
, 10 dBm is defined as __________ watts - ANSWERS-10 mW
3 dBm is defined as __________ watts - ANSWERS-2 mw
0 dBm is defined as __________ watts - ANSWERS-1 mW
How much gain/Loss is 3 dBm - ANSWERS-2X or 1/2
How much gain/Loss is 5 dBm - ANSWERS-3X or 1/3
How much gain/Loss is 6 dBm - ANSWERS-4X or 1/4
How much gain/Loss is 9 dBm - ANSWERS-8X or 1/8
How much gain/Loss is 10 dBm - ANSWERS-10X or 1/10
How much gain/Loss is 20 dBm - ANSWERS-20X or 1/100
How much gain/Loss is 30 dBm - ANSWERS-30X or 1/1000
How much gain/Loss is 40 dBm - ANSWERS-40X or 1/10000
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