41. WHICH OF THE FOLLOWING IS ASYNCHRONOUS PROTOCOLS?

A. BLASST

B. SDLC

C. HDLC

D. LAN

- IN A NETWORK WITH 50 COMPUTER, A MESH TOPOLOGY WOULD REQUIRE……. CABLES

A. 1225 CBALES

B. 50 CABLES

C. 1280 CABLES

D. 99 CABLES

- A VOICE GRADE TELEPHONE LINE CARRIES CONTINUE ELECTROMAGNETIC SIGNAL RANGING BETWEEN 300HZ AND 3300 HZ. WHAT WILL BE THE WAVELENGTH OF 15000 HZ TRAVELLING THROUGH A COPPER WIRE?

A. 333.33M

B. 13333.33M

C. 13.33M

D.333.33M

- THE SIGN CORPORATION OF ABC HAS A FULLY CONNECTED MESH NETWORK CONSISTING OF NINETY NINE DEVICES. CALCULATE THE NUMBER OF PORTS FOR EACH DEVICES

A. 95

B. 100

C. 80

D. 98

- THE SHIMLA CORPORATE OF INDIA HAS A FULLY CONNECTED MESH NETWORK CONSISTING OF NINE DEVICES. CALCULATE THE TOTAL NUMBER OF CABLE LINKS NEEDED

A. 36

B. 20

C. 45

D. 25

- MAXIMUM DATA RATE OF CHANNEL OF 3000 HZ BANDWIDTH AND S/N RATIO OF 30DB IS:

A. 30000 BPS

B. 75000 BPS

C. 60000 BPS

D. 3000 BPS

- THE NUMBER OF CROSS POINTS SWITCH, WHICH IS FULL DUPLEX IN NATURE AND THERE ARE NO SELF-CONNECTION IS

A. 100

B. 45

C. 50

D. 90

- A TERMINAL MULTIPLEXER HAS SIX 1200 BPS TERMINALS AND ‘N’ 300 BPS CONNECTED TO IT. THE OUTGOING LINE IS 9600 BPS. WHAT IS THE MAXIMUM VALUE OF N?

A. 4

B. 16

C. 8

D. 28

- CHARACTER PER SECOND (7 BITS + 1 PARITY) WHICH CAN BE TRANSMITTED OVER A 24000BPS LINE, IF THE TRANSFER IS SYNCHRONOUS (1 START AND 1 STOP BIT)

A. 275

B. 250

C. 240

D. 300

- SUPPOSE BSNL TELEPHONE LINE HAS BANDWIDTH OF 6100 HZ. THE SIGNAL TO NOISE RATIO IS 40 DB. THEN THE CAPACITY OF CHANNEL WOULD BE:

A. 80,176 BPS

B. 32,681 BPS

C. 38,821 BPS

D. 81,056 BPS

- WHEN A SIGNAL TRAVELS THROUGH A TRANSMISSION MEDIUM, ITS POWER BECOMES 100 TIMES. THEN GAIN/LOSS WOULD BE:

A. GAIN OF 80 DB

B. GAIN OF 20 DB

C. LOSS OF 80 DB

D. LOSS OF 20 DB

- CONSIDER A SIGNAL IS MEASURED AT TWO DIFFERENT POINTS. THE POWER IS P1 AT THE FIRST POINT AND P2 AT THE SECOND POINT. IF DB IS 0, THEN:

A. P_{2} IS ZERO

B. P_{2 }IS MUCH LARGER THAN P_{1}

C. P_{2 }EQUAL TO P_{1}

D. P_{2 }IS MUCH SMALLER THAN P_{1}

- FOR A PARTICULAR CHANNEL, THE BANDWIDTH IS 7200 HZ. SIGNAL STRENGTH IS OF 12 MICRO WATT AND ONE SIDED POWER SPECTRUM DENSITY OF WHITE NOISE IS 10^-12 WATT/HZ. THE CHANNEL CAPACITY WOULD BE:

A. 29.83 KBPS

B. 32.22 KBPS

C. 77 KBPS

D. 69 KBPS