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Browse complete papersWhat does PPP stand for in Wide Area Network ( WAN ) communication?
Private Port Protocol
Packet Transfer Protocol
Point-to-Point Protocol
Public Packet Protocol
Correct answer
Private Port Protocol
Which of the following statements about the Harvard architecture used in the 8051 microcontroller is correct?
Uses only RAM
Uses separate memory for program and data
Has no external memory support
Uses single memory for program and data
Correct answer
Uses only RAM
A magnetic material has a hysteresis loop area of 0.4 J for each cycle. If the material is subjected to a frequency of 40 Hz, what is the total hysteresis loss per second?
10 W
12 W
20 W
16 W
Correct answer
10 W
In the 8085 microprocessor, what operation is performed by the instruction SUI 20H?
Compares with 20H with the accumulator
Adds 20H to the accumulator
Subtracts 20H from the accumulator
Subtracts 20H from the accumulator with borrow
Correct answer
Compares with 20H with the accumulator
The LPF in a PLL determines which of the following dynamic characteristics?
Settling time and loop stability.
The free-running frequency of the VCO.
The maximum output power of the circuit.
The input impedance of the phase detector.
Correct answer
Settling time and loop stability.
A transmission line has a characteristic impedance of 50 ohm and is connected to a load of 100 ohm. The VSWR is _________.
2
4
1
0.5
Correct answer
2
In a LAN environment, switches improve network efficiency primarily by:
Broadcasting all frames to every device in the network
Forwarding frames selectively using MAC addresses
Converting digital signal to analog signal
Increasing collision occurrences and retransmitting
Correct answer
Broadcasting all frames to every device in the network
If the strength of the current in a straight wire is doubled, how does the magnitude of the magnetic field at a fixed distance from the wire change?
The field strength remains unchanged
The field strength doubles
The field strength is halved
The field strength quadruples
Correct answer
The field strength remains unchanged
Consider the following statements about RS-232 ports and connectors.
S1: DB9 connector is associated with RS-232
S2: RS-232 uses RJ45 connector for standard serial communication
S3: RS-232 communication is point-to-point
Which statements are TRUE?
Only S2 and S3
Only S1 and S2
Only S1 and S3
Only S1
Correct answer
Only S2 and S3
A 4 KB EPROM is organized with 8 data lines. How many address lines does it have?
14
8
12
10
Correct answer
14