Module 5.

4 (total 03)
1. An integrated avionics system, in analog implementation, there were many
large and heavy wiring bundles with point-to-point wiring, in addition to
reliability problems due to intermittent failure of: -
a. Wiring
b. Connector pin
c. Synchro and potentiometer.
Ans: Connector Pin,

2. In order to reduce aircraft weight and reliability, it became necessary to

decrease the number of aircraft: -
a. Weight and avionics
b. Wiring and connectors
c. Connectors and avionics.
Ans: Wiring and connectors.

3. Time Deviation Multiplexing (TDM) enabled different forms of information to

be transmitted through one: -
a. Communication system
b. Bus bar
c. Frequency
Ans: Communication system

4. To sample input data sequentially and then stagger the different data
samples in time to form a composite digital pulse train used by:-
a. Multiplexer
b. De-multiplexer
c. Both multiplexer and De-multiplexer
Ans: Multiplexer

5. MIL-STD -1553B has a data transfer rate of:-

a. 01 million bits per second
b. 02 Million bits per second
c. 02 Mbps
Ans: 01 Million bits per second

Q.6. The physical layout and connections of each device to the bus refer to:-
a. Controller b. Topology
c. Mission computer Ans: Topology
7. Receive and decode signals, reports error and correct them (MIL-STD-
1553B) by:-
a. Remote Terminal (RT)
b. Controller
c. Bus Monitor.
Ans: Remote Terminal (RT),

8. To isolate flight critical flight management functions from non-flight critical

mission related function (MIL-STD-1553B) used:-

a. Operational flight programme

b. Mission computer
c. Multi-level Buses
Ans: Multi level buses,

9. On occasions when the Bus Controller (BC) needs to send data to all
Remote Terminals (RT) at once are used ( MIL-STD-1553B):-

a. Isolation Transformer
b. Broadcast information transfer formats.
C. Operational Flight Program (OFP)
Ans: Broadcast information transfer formats.

10. An ARINC 429 bus uses: -

a A twisted shielded pair of wires

b. Two bi-directional twin sheathed and earthed wire.
c. A single twin wire cable for each transmitter.
Ans: A twisted shielded pair of wires

11. How many receiver terminals can be connected to an ARINC 429 data bus?

a. 120 b. 20 c. 60
Ans: 20

12. Major Limitation of A429 is that: -

a. A complex architecture b. Digital data can travel both direction.
c. A simple architecture. Ans: A simple architecture,
13. An ARINC 429 data word formed, bits 1 - 8 represent: -

a. Source of the message

b. Dataword Level
c. Sign and status matrix
Ans: Dataword Level

14. A629 data bus can handle: -

a. 131 terminals
b. 20 terminals
c. 629 Terminals
Ans: 131 terminals Ref: page: 4.5
15. A629 has a multi-source and multi-sync bus topology that is very similar to
MIL-STD-1553B, except that it does not have a:
a. Bus controller/Monitor
b. Separate channels
c. Bus controller/Monitor and Separate channels must be used to transmit and
receive.
Ans: Bus controller/Monitor and Separate channels must be used to transmit and
receive.

16. A629 that allocates an assigned time slot to each terminal in which it is
allowed to transmit on to the data bus used a time based :-

a. Collision-avoidance protocol.
B. Serial interface module
c. Telephone exchange network.
Ans: Collision-avoidance protocol.

17. ETHERNET original concept used ……………..as a shared medium:-

a. Bus
b. coaxial cable
c. Switch
Ans: Coaxial cable

18. Data transfer speed of ETHERNET is:-

a. 02 Mbps b. 100 Mbps
c. 01 Mbps Ans: 100 Mbps
19. ARINC 664 AFDX data transfer is accomplished via virtual links, which are
……….connections from one source terminal to one or more destination
terminals:
a. Unidirectional
b. Both directional
c. One directional
Ans: Unidirectional,

20. Communication network that is making its way onboard aircraft is IEEE
1394 also known as: -
a. ETHERNET
b. Firewire
c. Engine control.
Ans: Firewire,
21. An integrated avionics system consists of various subsystems and
components that need to:

a. Communicate with each other in order to share information.

b. Share information.
c. Communicate with each other.
Correct answer: a. Communicate with each other in order to share information.

22. In order to reduce aircraft weight and increase reliability, it became

necessary to:

a. Decrease the amount of aircraft wiring.

b. Decrease the number of aircraft connectors.
c. Decrease the amount of aircraft wiring and connectors.
Correct answer: c. Decrease the amount of aircraft wiring and connectors.

23. Avionics system designers began using ADCs and DACs with serial point-
to-point digital data buses requiring only:

a. Two twisted pairs of wires connecting single data transmitters and single data
receivers.
b. One twisted pairs of wires connecting single data transmitters.
c. One twisted pairs of wires connecting single data receivers.
Correct answer: a. Two twisted pairs of wires connecting single data transmitters and
single data receivers.
24. Time-Division Multiplexing (TDM) enabled different forms of information to
be transmitted through:

a. One communication system.

b. Between two communication system.
c. Among three communication system.
Correct answer: a. One communication system.

25. The TDM concept had evolved from single data source and single data sink
to multiple data sources and multiple data sinks residing on

a. A single multiplex bus.

b. A double multiplex bus.
c. A triple multiplex bus.
Correct answer: a. A single multiplex bus.

26. The Bus Monitor (BM) monitors the status of each transfer to determine
that the data was:

a. Successful transmitted and received.

b. Successful transmitted and received error free.
c. Successful received error free.
Correct answer: b. Successful transmitted and received error free.

27. Isolation transformers can be either directly coupled with:

a. No more than a 1 foot stub length, or transformer coupled with a maximum stub
length of 20 feet.
b. More than a 1 foot stub length, or transformer coupled with a maximum stub length
of 20 feet.
c. No more than a 2 foot stub length, or transformer coupled with a maximum stub
length of 20 feet.
Correct answer: a. No more than a 1 foot stub length, or transformer coupled with a
maximum stub length of 20 feet.

28. The command word tells the RT:

a. To receive data, transmit data, or to switch modes.

b. To receive data and transmit data.
c. To Transmit data and or to switch modes.
Correct answer: a. To receive data, transmit data, or to switch modes.
29. Aeronautical Radio Incorporated (ARINC) was formed in

a. 1919.
b. 1929.
c. 1939.
Correct answer: b. 1929.

30. ARINC 429 has a:

a. Self-clocking and self-synchronizing data bus protocol.

b. Self-synchronizing data bus protocol.
c. Self-clocking.
Correct answer: a. Self-clocking and self-synchronizing data bus protocol.

31. A629 data bus, used in the Boeing 777, has a data rate of 2 Mbps, which is
20 times faster than A429, and can handle:

a. 130 terminals instead of only 20.

b. 131 terminals instead of only 20.
c. 132 terminals instead of only 20.
Correct answer: b. 131 terminals instead of only 20.

32. Each data frame contains of a source address and destination address, in
addition to error checking so that:

a. Damaged data can be detected.

b. The data frame retransmitted if required.
c. Damaged data can be detected and the data frame retransmitted if required.
Correct answer: c. Damaged data can be detected and the data frame retransmitted if
required.
Ref: Digital Techniques Electronic Instrument Systems 5.4.6

33. ARINC 664 Avionics Full-Duplex Switched (AFDX) network, currently being
used in:

a. The Airbus A380 and the Boeing 787.

b. The Airbus A380.
c. The Airbus A380, the Boeing 777 and the Boeing 787.
Correct answer: a. The Airbus A380 and the Boeing 787.
34. AFDX network topology consists of:

a. Switches for traffic policing and LRU terminals for traffic shaping.
b. Switches for traffic policing and integrity checking.
c. Switches for traffic policing and LRU terminals for traffic shaping and integrity
checking.
Correct answer: c. Switches for traffic policing and LRU terminals for traffic shaping and
integrity checking.

35. The switches and the terminals communicate with each other:

a. Simultaneously (full-duplex) to prevent data collisions.

b. Continuously to prevent data collisions.
c. Repeatedly to prevent data collisions.
Correct answer: a. Simultaneously (full-duplex) to prevent data collisions.

36. AFDX data words will contain:

a. Destination and source addresses.

b. Destination and the frame size can be anywhere from 64 to 1518 bytes.
c. Destination and source addresses and the frame size can be anywhere from 64
to 1518 bytes.
Correct answer: c. Destination and source addresses and the frame size can be
anywhere from 64 to 1518 bytes.

37. IEEE 1394 Firewire Management System for:

a. Flight control, engine control and utility systems control, due to its large
bandwidth and fault-tolerant topology.
b. Flight control and utility systems control, due to its large bandwidth and fault-
tolerant topology.
c. Engine control and utility systems control, due to its large bandwidth and fault-
tolerant topology.
Correct answer: a. Flight control, engine control and utility systems control, due to its
large bandwidth and fault-tolerant topology.

38. IEEE 1394 FIREWIRE has since become popular for aircraft in-flight
entertainment systems for streaming high speed video signals due to its
high data rate of up to:

A. 800 Mbps.
B. 700 Mbps.
c. 600 Mbps. Correct answer: a. 800 Mbps.
39. An integrated avionics system consists of various subsystems and
components that need to:

a. Communicate with each other in order to share information.

b. Share information.
c. Communicate with each other.
Correct answer: a. Communicate with each other in order to share information.

40. In order to reduce aircraft weight and increase reliability, it became

necessary to:

a. Decrease the amount of aircraft wiring.

b. Decrease the amount of aircraft connectors.
c. Decrease the amount of aircraft wiring and connectors.
Correct answer: c. Decrease the amount of aircraft wiring and connectors.

41. Avionics system designers began using ADCs and DACs with serial point-
to-point digital data buses requiring only:

a. Two twisted pairs of wires connecting single data transmitters and single data
receivers.
b. One twisted pairs of wires connecting single data transmitters.
c. One twisted pairs of wires connecting single data receivers.
Correct answer: a. Two twisted pairs of wires connecting single data transmitters and
single data receivers.

42. Time-Division Multiplexing (TDM) enabled different forms of information to

be transmitted through:

a. One communication system.

b. Between two communication system.
c. Among three communication system.
Correct answer: a. One communication system.
Ref: Digital Techniques Electronic Instrument Systems 5.4

43. The TDM concept had evolved from single data source and single data sink
to multiple data sources and multiple data sinks residing on

a. A single multiplex bus.

b. A double multiplex bus.
c. A triple multiplex bus.
Correct answer: a. A single multiplex bus.
44. The Bus Monitor (BM) monitors the status of each transfer to determine
that the data was:

a. Successful transmitted and received.

b. Successful transmitted and received error free.
c. Successful received error free.
Correct answer: b. Successful transmitted and received error free.

45. Isolation transformers can be either directly coupled with:

a. No more than a 1 foot stub length, or transformer coupled with a maximum stub
length of 20 feet.
b. More than a 1 foot stub length, or transformer coupled with a maximum stub
length of 20 feet.
c. No more than a 2 foot stub length, or transformer coupled with a maximum stub
length of 20 feet.
Correct answer: a. No more than a 1 foot stub length, or transformer coupled with a
maximum stub length of 20 feet.

46. The command word tells the RT:

a. To receive data, transmit data, or to switch modes.

b. To receive data and transmit data.
c. To Transmit data and or to switch modes.
Correct answer: a. To receive data, transmit data, or to switch modes.

47. Aeronautical Radio Incorporated (ARINC) was formed in

a. 1919.
b. 1929.
c. 1939.
Correct answer: b. 1929.

48. ARINC 429 has a:

a. Self-clocking and self-synchronizing data bus protocol.

b. Self-synchronizing data bus protocol.
c. Self-clocking.
Correct answer: a. Self-clocking and self-synchronizing data bus protocol.
49. A629 data bus, used in the Boeing 777, has a data rate of 2 Mbps, which is
20 times faster than A429, and can handle:

a. 130 terminals instead of only 20.

b. 131 terminals instead of only 20.
c. 132 terminals instead of only 20.
Correct answer: b. 131 terminals instead of only 20.

50. Each data frame contains of a source address and destination address, in
addition to error checking so that:

a. Damaged data can be detected.

b. The data frame retransmitted if required.
c. Damaged data can be detected and the data frame retransmitted if required.
Correct answer: c. Damaged data can be detected and the data frame retransmitted if
required.

51. ARINC 664 Avionics Full-Duplex Switched (AFDX) network, currently being
used in:

a. The Airbus A380 and the Boeing 787.

b. The Airbus A380.
c. The Airbus A380, the Boeing 777 and the Boeing 787.
Correct answer: a. The Airbus A380 and the Boeing 787.

52. AFDX network topology consists of:

a. Switches for traffic policing and LRU terminals for traffic shaping.
b. Switches for traffic policing and integrity checking.
c. Switches for traffic policing and LRU terminals for traffic shaping and integrity
checking.
Correct answer: c. Switches for traffic policing and LRU terminals for traffic shaping and
integrity checking.

53. The switches and the terminals communicate with each other:

a. Simultaneously (full-duplex) to prevent data collisions.

b. Continuously to prevent data collisions.
c. Repeatedly to prevent data collisions.
Correct answer: a. Simultaneously (full-duplex) to prevent data collisions.
54. AFDX data words will contain:

a. Destination and source addresses.

b. Destination and the frame size can be anywhere from 64 to 1518 bytes.
c. Destination and source addresses and the frame size can be anywhere from 64
to 1518 bytes.
Correct answer: c. Destination and source addresses and the frame size can be
anywhere from 64 to 1518 bytes.

55. IEEE 1394 Firewire Management System for:

a. Flight control, engine control and utility systems control, due to its large
bandwidth and fault-tolerant topology.
b. Flight control and utility systems control, due to its large bandwidth and fault-
tolerant topology.
c. Engine control and utility systems control, due to its large bandwidth and fault-
tolerant topology.
Correct answer: a. Flight control, engine control and utility systems control, due to its
large bandwidth and fault-tolerant topology.

56. IEEE 1394 FIREWIRE has since become popular for aircraft in-flight
entertainment systems for streaming high speed video signals due to its
high data rate of up to:

A. 800 Mbps.
B. 700 Mbps.
c. 600 Mbps.
Correct answer: a. 800 Mbps.

57. Digital data buses requiring only two twisted pairs of wires connecting -

A. Single data sources and single data sinks

B. Dual data sources and single data sinks
C. Single data sources and dual data sinks
Correct Answer: A- Single data sources and single data sinks

58. In order to reduce aircraft weight and increase reliability, it became

necessary -

A. to decrease the amount of aircraft wiring and connectors

B. to increase the amount of aircraft wiring and connectors
C. to use heavy the amount of aircraft wiring and connectors
Correct Answer: A- to decrease the amount of aircraft wiring and connectors
59. MIL-STD-1553B is an asynchronous half-duplex bus, meaning that –

A. Data can move in only one directions, but both direction at a time
B. Data can move in only one directions at a time
C. Data can move in both directions, but only in one direction at a time
Correct Answer: C- Data can move in both directions, but only in one direction at a time

60. Typically, the Bus Monitor and the Bus Controller are physically located
within the same "black box" or Line Replaceable Unit (LRU), often called

A. Remote Terminal
B. Mission Computer
C. Bus Monitor
Correct Answer: B- Mission Computer

61. They are used to isolate flight-critical flight management functions from
non-flight critical mission-related functions-

A. Multi-level-buses
B. Operational Flight Program
C. Mission computer
Correct Answer: A- Multi-level-buses

62. It has a self-clocking, self-synchronizing data bus protocol similar to 1553B,

and it uses shielded twisted-pair wires for a physical connection.

A. ARINC 664
B. ARINC 629
C. ARINC 429
Correct Answer: C- ARINC 429

63. ARINC 429 uses a return-to-zero modulation technique to form each bit
meaning that

A. logic state "1" is achieved by voltage moving from high to null and logic state "0" is
obtained by going from null to low
B. logic state "1" is achieved by voltage moving from null to high and logic state "0" is
obtained by going from high to null
C. logic state "1" is achieved by voltage moving from high to high and logic state "0"
is obtained by going from null to null
Correct Answer: A- logic state "1" is achieved by voltage moving from high to null and
logic state "0" is obtained by going from null to low
64. ARINC 629 has a multiple-source and multiple-sync bus topology that is
very similar to MIL-STD-1553B, except that it does –

A. Have a Remote Controller, and separate channels must be used to transmit and
receive.
B. Have a Bus Controller/Monitor, and separate channels must be used to transmit
and receive.
C. Not have a Bus Controller/Monitor, and separate channels must be used to
transmit and receive.
Correct Answer: C- Not have a Bus Controller/Monitor, and separate channels must be
used to transmit and receive.

65. The newer ARINC 629 data bus has a data rate of 2 Mbps, which is –

A. 10 times faster than ARINC 429

B. 20 times faster than ARINC 429
C. 30 times faster than ARINC 429
Correct Answer: B-20 times faster than ARINC 429

66. ARINC 629 data words consist of –

A. 3 sync bits, 16 data bits, and 1 parity bit.

B. 4 sync bits, 26 data bits, and 2 parity bit
C. 5 sync bits, 16 data bits, and 3 parity bit
Correct Answer: A-3 sync bits, 16 data bits, and 1 parity bit.

67. In ARINC 664 AFDX, Data transfer is accomplished via ----which are unidirectional
connections from one source terminal to one or more destination terminals.

A. “Ethernet”
B. "virtual links"
C. “Firewire”
Correct Answer: B-"virtual links"

68. It consists of switches for traffic policing and LRU terminals (end systems)
for traffic shaping and integrity checking by-

A. The AFDX network topology

B. Fault tolerant topology
C. Ethernet topology
Correct Answer: A- The AFDX network topology
69. It has since become popular for aircraft in-flight entertainment systems for
streaming high speed video signals due to its high data rate of up to 800
Mbps

A. ARINC 629
B. ARINC 664 AFDX
C. IEEE 1394 FIREWIRE
Correct Answer: C- IEEE 1394 FIREWIRE

70. In a data bus topology, which initiates all data transfers by sending a
command to a specified remote terminal is called-

A. Bus Controller (BC)

B. Remote Terminal (RT)
C. Bus Monitor (BM)
Correct Answer: A- Bus Controller (BC)
71. In a data bus topology, it is used to receive and decode the signals, reports
errors and correct them is called-

A. Bus Controller (BC)

B. Remote Terminal (RT)
C. Bus Monitor (BM)
Correct Answer: B- Remote Terminal (RT)
72. In ARINC 629, LRUs are programmed to transmit:

a. one at a time.
b. one transmits and one receives.
c. all at the same time.
Correct Answer is (b). one transmits and one receives.

73. An integrated avionics system consists of various subsystems and

components that need to:

a. Communicate with each other in order to share information.

b. Share information.
c. Communicate with each other.
Correct answer is (a): Communicate with each other in order to share information.

74. In order to reduce aircraft weight and increase reliability, it became

necessary to:

a. Decrease the amount of aircraft wiring.

b. Decrease the amount of aircraft connectors.
c. Decrease the amount of aircraft wiring and connectors.
Correct answer is (c): Decrease the amount of aircraft wiring and connectors.

75. Point-to point wiring between various and their dedicated cockpit
instruments, the reliability problems due to intermittent: -

a. short circuit failure.

b. connector pin failure.
c. circuit breaker failure.
Correct Answer is (b). connector pin failure
76. The original concept used coaxial cables as a shared medium in:

a. Ethernet
b. Aeronautical Radio Incorporated (ARINC) 429
c. Computer
Correct Answer is (a). Ethernet

77. Function of an asynchronous bus is that, data can move in both directions
at the same time is:

a. Ethernet
b. Full-duplex
c. half-duplex
Correct Answer is b. Full-duplex

78. Function of an asynchronous bus is that, data can move in both directions,
but only in one direction at a time is:

a. Ethernet
b. Full-duplex
c. half-duplex
Correct Answer is (C). Half-duplex

79. Avionics system designers began using Analog-to-Digital Convertors and

Digital-to-Analog Convertors with serial point-to-point digital data buses
requiring Two twisted pairs of wires connecting:

a. single data transmitters and single data receivers.

b. single data transmitters.
c. single data receivers.
Correct answer is (a): single data transmitters and single data receivers.
80. Digital data buses requiring only two twisted pairs of wires connecting –

a. Single data sources and single data sinks

b. Dual data sources and single data sinks
c. Single data sources and dual data sinks
Correct Answer: A- Single data sources and single data sinks

81. In order to reduce aircraft weight and increase reliability, it became the
necessary to decrease the: -

a. avionics sets.
b. amount of electrical equipment.
c. amount of aircraft wiring and connectors.
Correct answer is (c). amount of aircraft wiring and connectors.

82. Time-Division Multiplexing (TDM) enabled different forms of information to

be transmitted through:

a. One communication system.

b. Between two communication system.
c. Among three communication system.
Correct answer (is): One communication system.

83. The Time-Division Multiplexing (TDM) concept had evolved from single
data source and single data sink to multiple data sources and multiple data
sinks residing on:

a. A single multiplex bus.

b. A double multiplex bus.
c. A triple multiplex bus.
Correct answer is (a): A single multiplex bus.

84. Time-Division Multiplexing (TDM) enabled different forms of information: -

a. to be transmitted through one communication system.

b. to be communicate through one transmitter system.
c. to be communicate through two transmitter system.
Correct Answer is (a). to be transmitted through one communication system

85. Function of a bus of cell phone which one to talk and listen simultaneously
is:
a. Ethernet b. Full-duplex
c. half-duplex Correct Answer is B. Full-duplex
86. Function of a bus of a speakerphone that does not allow one to speak while
another person is talking is:

a. Ethernet
b. Full-duplex
c. Half-duplex
Correct Answer is C. Half-duplex
87. The Bus Monitor (BM) monitors the status of each transfer to determine
that the data was:

a. Successful transmitted and received.

b. Successful transmitted and received error free.
c. Successful received error free.
Correct answer is (b): Successful transmitted and received error free.

88. Isolation transformers can be either directly coupled with stub length, or
transformer coupled with a maximum stub length of 20 feet with a distance
of:

a. Not more than 1 foot

b. More than 1 foot
c. Not more than 2 feet
Correct answer is (a): Not more than 1 foot

89. The Time-Division Multiplexing (TDM) concept had evolved from single
data source and single data sink to: -

a. multiple data sources.

b. double data sources.
c. multiple data sources.
Correct Answer is (a). multiple data sources.

90. Typically, the Bus Monitor and the Bus Controller are physically located
within the same "black box" or Line Replaceable Unit (LRU), often called

a. Remote Terminal
b. Mission Computer
c. Bus Monitor
Correct Answer: B- Mission Computer

91. The command word tells the Remote Transmittals (RT):

a. To receive data, transmit data, or to switch modes.

b. To receive data and transmit data.
c. To Transmit data and or to switch modes.
Correct answer is (a): To receive data, transmit data, or to switch modes.

92. The successful transmutation and receiving error free data is determined
by:

a. Bus Monitor (BM)

b. Bus Controller
c. Half-duplex
Correct Answer is a. Bus Monitor (BM)
93. Typically, the Bus Monitor and the Bus Controller are physically located
within:

a. Combined Bus
b. black box or Line Replaceable Unit (LRU).
c. Remote Transmittals (RT)
Correct Answer is b. black box or Line Replaceable Unit (LRU).

94. The busses used to isolate flight-critical flight management functions from
non-flight critical mission-related functions are:

a. Remote Transmittals (RT)

b. black boxes or Line Replaceable Units (LRU).
c. Multi-level buses
Correct Answer is c. Multi-level buses.

95. MIL-STD-1553B is an asynchronous half-duplex bus, meaning that –

a. Data can move in only one directions, but both direction at a time
b. Data can move in only one directions at a time
c. Data can move in both directions, but only in one direction at a time
Correct Answer: C- Data can move in both directions, but only in one direction at a time

96. Q. No. 23. ARINC 429 has a capability of:

a. Self-clocking and self-synchronizing data bus protocol.

b. Self-synchronizing data bus protocol.
c. Self-clocking.
Correct answer is (a): Self-clocking and self-synchronizing data bus protocol.
97. It has a self-clocking, self-synchronizing data bus protocol similar to
1553B, and it uses shielded twisted-pair wires for a physical connection.

a. ARINC 664
b. ARINC 629
c. ARINC 429
Correct Answer: C- ARINC 429

98. “Data can’t travel in the opposite direction on the same bus” is the major
limitation of:

a. ARRINC A429
b. ARRINC A629
c. Multi-level buses
Correct Answer is (a). ARRINC A429

99. The commercial network which is popular for aircraft in-flight entertainment
systems for streaming high-speed video signals:

a. Multi-level buses
b. ARRINC A629
c. Firewire
Correct Answer is C. Firewire
100. In ARINC 664 AFDX, Data transfer is accomplished via ----which are
unidirectional connections from one source terminal to one or more
destination terminals.

a. “Ethernet”
b. "virtual links"
c. “Firewire”
Correct Answer: B-"virtual links"

101. An example of half- duplex operation of MIL-STD-1533B asynchronous is a

speakerphone that: -

a. does not allow one to speak while another person is talking.

b. does allow one to speak while another person is talking.
c. does allow one to talk and listen simultaneously more than one person.
Correct Answer is (a). does not allow one to speak while another person is talking.
102. Each data frame contains of a source address and destination address, in
addition to error checking so that:

a. Damaged data can be detected.

b. The data frame retransmitted if required.
C. Damaged data can be detected and the data frame retransmitted if required.
Correct answer is (a): Damaged data can be detected and the data frame retransmitted
if required.

103. Multiple level topologies are formed by interconnecting single-level buses so

that, data from one bus can be transferred on to: -

a. another bus.
b. other double buses.
c. same bus.
Correct Answer is (a). another bus

104. The A629 data bus has a data rate of 2 Mbps, which is: -

a. 15 times faster than A429.

b. 10 times faster than A429.
c. 20 times faster than A429.
Correct Answer is (c). 20 times faster than A429.

105. A629 data words consist of: -

a. 5 sync bits, 20 data bits and 1 parity bit.

b. 3 sync bits, 16 data bits and 1 parity bit.
c. 3 sync bits, 12 data bits and 2 parity bits.
Correct Answer is (b). 3 sync bits, 16 data bits and 1 parity bit.

106. The switches and the terminals communicate with each other to prevent data
collisions:

a. Simultaneously (full-duplex)
b. Continuously.
c. Repeatedly.
Correct answer: Simultaneously (full-duplex).

107. Avionics Full-Duplex Switched Avionics Full-Duplex Switched (AFDX) data

words will contain:

a. Destination and output source.

b. Destination and the frame size.
c. Destination, source addresses and limited frame size.
Correct answer is (C) : Destination and source addresses and limited frame size.

108. IEEE 1394 FIREWIRE network become popular for aircraft in-flight
entertainment systems for: -

a. streaming high-speed video signals

b. streaming low-speed video signals
c. streaming constant-speed video signals
Correct Answer is (a). streaming high-speed video signals

109. IEEE 1394 FIREWIRE has since become popular for aircraft in-flight
entertainment systems for streaming high speed video signals due to its high
data rate of up to:

a. 800 Mbps.
b. 700 Mbps.
c. 600 Mbps.
Correct answer is (a): 800 Mbps.

110. It has since become popular for aircraft in-flight entertainment systems for
streaming high speed video signals due to its high data rate of up to 800 Mbps

D. ARINC 629
E. ARINC 664 AFDX
F. IEEE 1394 FIREWIRE
Correct Answer: C- IEEE 1394 FIREWIRE

111. ARINC 429 uses a return-to-zero modulation technique to form each bit
meaning that

a. logic state "1" is achieved by voltage moving from high to null and logic state "0"
is obtained by going from null to low
b. logic state "1" is achieved by voltage moving from null to high and logic state "0"
is obtained by going from high to null
c. logic state "1" is achieved by voltage moving from high to high and logic state "0"
is obtained by going from null to null
Correct Answer: A- logic state "1" is achieved by voltage moving from high to null and
logic state "0" is obtained by going from null to low
112. ARINC 629 has a multiple-source and multiple-sync bus topology that is very
similar to MIL-STD-1553B, except that it does –

a. Have a Remote Controller, and separate channels must be used to transmit and
receive.
b. Have a Bus Controller/Monitor, and separate channels must be used to transmit
and receive.
c. Not have a Bus Controller/Monitor, and separate channels must be used to
transmit and receive.
Correct Answer: C- Not have a Bus Controller/Monitor, and separate channels must be
used to transmit and receive.

113. It consists of switches for traffic policing and LRU terminals (end systems) for
traffic shaping and integrity checking by-

a. The AFDX network topology

b. Fault tolerant topology
c. Ethernet topology
Correct Answer: A- The AFDX network topology

114. In a data bus topology, which initiates all data transfers by sending a command
to a specified remote terminal is called-

a. Bus Controller (BC)

b. Remote Terminal (RT)
c. Bus Monitor (BM)
Correct Answer: A- Bus Controller (BC)y6

115. In a data bus topology, it is used to receive and decode the signals, reports
errors and correct them is called-

a. Bus Controller (BC)

b. Remote Terminal (RT)
c. Bus Monitor (BM)
Correct Answer: B- Remote Terminal (RT)